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opennurbs/opennurbs_subd_texture.cpp
Bozo The Builder e7c29061e3 Sync changes from upstream repository 
Co-authored-by: Alain <alain@mcneel.com>
Co-authored-by: Andrew Le Bihan <andy@mcneel.com>
Co-authored-by: chuck <chuck@mcneel.com>
Co-authored-by: croudyj <croudyj@gmail.com>
Co-authored-by: Dale Fugier <dale@mcneel.com>
Co-authored-by: Giulio Piacentino <giulio@mcneel.com>
Co-authored-by: Greg Arden <greg@mcneel.com>
Co-authored-by: Jussi Aaltonen <jussi@mcneel.com>
Co-authored-by: kike-garbo <kike@mcneel.com>
Co-authored-by: Steve Baer <steve@mcneel.com>
2022-11-21 14:18:57 -08:00

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//
// Copyright (c) 1993-2022 Robert McNeel & Associates. All rights reserved.
// OpenNURBS, Rhinoceros, and Rhino3D are registered trademarks of Robert
// McNeel & Associates.
//
// THIS SOFTWARE IS PROVIDED "AS IS" WITHOUT EXPRESS OR IMPLIED WARRANTY.
// ALL IMPLIED WARRANTIES OF FITNESS FOR ANY PARTICULAR PURPOSE AND OF
// MERCHANTABILITY ARE HEREBY DISCLAIMED.
//
// For complete openNURBS copyright information see <http://www.opennurbs.org>.
//
////////////////////////////////////////////////////////////////
#include "opennurbs.h"
#if !defined(ON_COMPILING_OPENNURBS)
// This check is included in all opennurbs source .c and .cpp files to insure
// ON_COMPILING_OPENNURBS is defined when opennurbs source is compiled.
// When opennurbs source is being compiled, ON_COMPILING_OPENNURBS is defined
// and the opennurbs .h files alter what is declared and how it is declared.
#error ON_COMPILING_OPENNURBS must be defined when compiling opennurbs
#endif
#include "opennurbs_subd_data.h"
unsigned char ON_SubD::ObsoleteTextureDomainTypeFromTextureCoordinateType(ON_SubDTextureCoordinateType texture_coordinate_type)
{
/*
OBSOLETE enum class ON_SubDTextureDomainType : unsigned char
{
///<summary>
/// Texture domains are not set.
///</summary>
Unset = 0,
///<summary>
/// Each face texture domain is a unique rectangle of normlized texture space.
///</summary>
PerFace = 1,
///<summary>
/// Each face texture domain is a unique rectangle of normlized texture space.
/// When possible, faces are partitioned into quad groups. Adjactent members
/// of the group are assigned adjacent rectangles in texture space.
///</summary>
Packed = 2,
///<summary>
/// All face texture domain values are zero.
///</summary>
Zero = 3,
///<summary>
/// All face texture domain values are nan.
///</summary>
Nan = 4,
///<summary>
/// All face texture domain is (0,1)x(0,1).
///</summary>
UnitSquare = 5,
///<summary>
/// Code outside of opennurbs set the values. No other information is available.
///</summary>
Custom = 7,
};
*/
unsigned char obsolete_texture_domain_type = 0;
switch (texture_coordinate_type)
{
case ON_SubDTextureCoordinateType::Unset:
obsolete_texture_domain_type = 0; // OBSOLETE ON_SubDTextureDomainType::Unset = 0
break;
case ON_SubDTextureCoordinateType::Unpacked:
obsolete_texture_domain_type = 1; // OBSOLETE ON_SubDTextureDomainType::PerFace = 1
break;
case ON_SubDTextureCoordinateType::Packed:
obsolete_texture_domain_type = 2; // OBSOLETE ON_SubDTextureDomainType::Packed = 2
break;
case ON_SubDTextureCoordinateType::Zero:
obsolete_texture_domain_type = 3; // OBSOLETE ON_SubDTextureDomainType::Zero = 3
break;
case ON_SubDTextureCoordinateType::Nan:
obsolete_texture_domain_type = 4; // OBSOLETE ON_SubDTextureDomainType::Nan = 4
break;
case ON_SubDTextureCoordinateType::FromFaceTexturePoints:
obsolete_texture_domain_type = 6; // no corresponding OBSOLETE ON_SubDTextureDomainType
break;
case ON_SubDTextureCoordinateType::FromMapping:
obsolete_texture_domain_type = 7; // OBSOLETE ON_SubDTextureDomainType::Custom = 7
break;
default:
obsolete_texture_domain_type = 0;
break;
}
return obsolete_texture_domain_type;
}
ON_SubDTextureCoordinateType ON_SubD::TextureCoordinateTypeFromObsoleteTextureDomainType(
unsigned int obsolete_texture_domain_type_as_unsigned
)
{
/*
OBSOLETE enum class ON_SubDTextureDomainType : unsigned char
{
///<summary>
/// Texture domains are not set.
///</summary>
Unset = 0,
///<summary>
/// Each face texture domain is a unique rectangle of normlized texture space.
///</summary>
PerFace = 1,
///<summary>
/// Each face texture domain is a unique rectangle of normlized texture space.
/// When possible, faces are partitioned into quad groups. Adjactent members
/// of the group are assigned adjacent rectangles in texture space.
///</summary>
Packed = 2,
///<summary>
/// All face texture domain values are zero.
///</summary>
Zero = 3,
///<summary>
/// All face texture domain values are nan.
///</summary>
Nan = 4,
///<summary>
/// All face texture domain is (0,1)x(0,1).
///</summary>
UnitSquare = 5,
///<summary>
/// Code outside of opennurbs set the values. No other information is available.
///</summary>
Custom = 7,
};
*/
switch (obsolete_texture_domain_type_as_unsigned)
{
case 0: // OBSOLETE ON_SubDTextureDomainType::Unset = 0
return ON_SubDTextureCoordinateType::Unset;
break;
case 1: // OBSOLETE ON_SubDTextureDomainType::PerFace = 1
return ON_SubDTextureCoordinateType::Unpacked;
break;
case 2: // OBSOLETE ON_SubDTextureDomainType::Packed = 2
return ON_SubDTextureCoordinateType::Packed;
break;
case 3: // OBSOLETE ON_SubDTextureDomainType:: Zero = 3
return ON_SubDTextureCoordinateType::Zero;
break;
case 4: // OBSOLETE ON_SubDTextureDomainType::Nan = 4
return ON_SubDTextureCoordinateType::Nan;
break;
case 5: // OBSOLETE ON_SubDTextureDomainType::UnitSquare = 5
return ON_SubDTextureCoordinateType::Unset;
break;
case 6: // no corresponding OBSOLETE ON_SubDTextureDomainType
return ON_SubDTextureCoordinateType::FromFaceTexturePoints;
break;
case 7: // OBSOLETE ON_SubDTextureDomainType::Custom = 7
return ON_SubDTextureCoordinateType::FromMapping;
break;
}
return ON_SubDTextureCoordinateType::Unset;
}
ON_SubDTextureCoordinateType ON_SubD::TextureCoordinateTypeFromUnsigned
(
unsigned int texture_coordinate_type_as_unsigned
)
{
switch (texture_coordinate_type_as_unsigned)
{
ON_ENUM_FROM_UNSIGNED_CASE(ON_SubDTextureCoordinateType::Unset);
ON_ENUM_FROM_UNSIGNED_CASE(ON_SubDTextureCoordinateType::Unpacked);
ON_ENUM_FROM_UNSIGNED_CASE(ON_SubDTextureCoordinateType::Packed);
ON_ENUM_FROM_UNSIGNED_CASE(ON_SubDTextureCoordinateType::Zero);
ON_ENUM_FROM_UNSIGNED_CASE(ON_SubDTextureCoordinateType::Nan);
ON_ENUM_FROM_UNSIGNED_CASE(ON_SubDTextureCoordinateType::FromFaceTexturePoints);
ON_ENUM_FROM_UNSIGNED_CASE(ON_SubDTextureCoordinateType::FromMapping);
}
return ON_SUBD_RETURN_ERROR(ON_SubDTextureCoordinateType::Unset);
}
const ON_wString ON_SubD::TextureCoordinateTypeToString(
ON_SubDTextureCoordinateType texture_coordinate_type
)
{
const wchar_t* s;
switch (texture_coordinate_type)
{
case ON_SubDTextureCoordinateType::Unset:
s = L"Unset";
break;
case ON_SubDTextureCoordinateType::Unpacked:
s = L"Unpacked";
break;
case ON_SubDTextureCoordinateType::Packed:
s = L"Packed";
break;
case ON_SubDTextureCoordinateType::Zero:
s = L"Zero";
break;
case ON_SubDTextureCoordinateType::Nan:
s = L"Nan";
break;
case ON_SubDTextureCoordinateType::FromFaceTexturePoints:
s = L"FromFaceTexturePoints";
break;
case ON_SubDTextureCoordinateType::FromMapping:
s = L"FromMapping";
break;
default:
s = nullptr;
break;
}
return (nullptr != s && 0 != s[0])
? ON_wString(s)
: ON_wString::FormatToString(L"ON_SubDTextureCoordinateType(%u)", ((unsigned)static_cast<unsigned char>(texture_coordinate_type)));
}
//////////////////////////////////////////////////////////////////////////////
//
// ON_SubDimple - texture coordinates
//
#if 1
#pragma region ON_SubD - texture coordinates
void ON_SubDimple::SetTextureMappingTag(const ON_MappingTag &mapping_tag) const
{
if (0 != ON_MappingTag::CompareAll(this->m_texture_mapping_tag, mapping_tag))
{
this->m_texture_mapping_tag = mapping_tag;
ChangeRenderContentSerialNumber();
}
}
const ON_MappingTag ON_SubDimple::TextureMappingTag(bool bIgnoreTextureCoordinateType) const
{
return
(bIgnoreTextureCoordinateType || ON_SubDTextureCoordinateType::FromMapping == TextureCoordinateType())
? m_texture_mapping_tag
: ON_MappingTag::Unset;
}
#pragma endregion
#endif
const ON_MappingTag ON_SubDimple::FragmentColorsMappingTag() const
{
return m_fragment_colors_mapping_tag;
}
void ON_SubDimple::SetFragmentColorsMappingTag(const ON_MappingTag& mapping_tag) const
{
if (0 != ON_MappingTag::CompareAll(this->m_fragment_colors_mapping_tag, mapping_tag))
{
this->m_fragment_colors_mapping_tag = mapping_tag;
ChangeRenderContentSerialNumber();
}
}
//////////////////////////////////////////////////////////////////////////////
//
// ON_SubD - texture coordinates
//
#if 1
#pragma region ON_SubD - texture coordinates
ON_SubDTextureCoordinateType ON_SubD::TextureCoordinateType() const
{
const ON_SubDimple* subdimple = SubDimple();
return (nullptr != subdimple) ? subdimple->TextureCoordinateType() : ON_SubDTextureCoordinateType::Unset;
}
ON_SubDTextureCoordinateType ON_SubDimple::TextureCoordinateType() const
{
return m_texture_coordinate_type;
}
unsigned int ON_SubD::TexturePointsAreSet() const
{
unsigned int count = 0;
ON_SubDFaceIterator fit(*this);
for (const ON_SubDFace* f = fit.FirstFace(); nullptr != f; f = fit.NextFace())
{
if (f->TexturePointsAreSet())
++count;
}
return count;
}
unsigned int ON_SubD::ClearTexturePoints() const
{
const bool bUpdateFragments = ON_SubDTextureCoordinateType::FromFaceTexturePoints == this->TextureCoordinateType();
const ON_SubDimple* subdimple = SubDimple();
const unsigned count = (nullptr != subdimple) ? subdimple->ClearTexturePoints() : 0;
if (bUpdateFragments)
this->Internal_SetFragmentTextureCoordinatesWithoutMapping();
return count;
}
unsigned int ON_SubDimple::ClearTexturePoints() const
{
bool bSetPacked = ON_SubDTextureCoordinateType::FromFaceTexturePoints == this->TextureCoordinateType();
if ( bSetPacked)
this->SetTextureCoordinateType(ON_SubDTextureCoordinateType::Unset);
const ON_SubDLevel& level = this->ActiveLevel();
unsigned int count = 0;
for (const ON_SubDFace* f = level.m_face[0]; nullptr != f; f = f->m_next_face)
{
if (f->TexturePointsAreSet())
++count;
this->ReturnFaceTexturePoints(f);
if (bSetPacked && false == f->PackRectIsSet())
bSetPacked = false;
}
if (bSetPacked)
this->SetTextureCoordinateType(ON_SubDTextureCoordinateType::Packed);
return count;
}
void ON_SubDimple::SetTextureCoordinateType(
ON_SubDTextureCoordinateType texture_coordinate_type
) const
{
if (m_texture_coordinate_type != texture_coordinate_type)
{
ChangeRenderContentSerialNumber();
m_texture_coordinate_type = texture_coordinate_type;
}
}
const ON_2udex ON_SubD::TextureDomainGridSize(
unsigned minimum_rectangle_count,
double image_width,
double image_height
)
{
if (0 == minimum_rectangle_count)
return ON_2udex(1, 1);
unsigned i = (unsigned)floor(sqrt((double)(minimum_rectangle_count)));
while (i < minimum_rectangle_count && i*i < minimum_rectangle_count)
++i;
unsigned int j = i;
if (j > 1 && (j - 1)*i >= minimum_rectangle_count)
--j;
return (image_height > image_width) ? ON_2udex(j, i) : ON_2udex(i, j);
}
double ON_SubDFace::PackRectGapInPixels(
double pack_rect_distance_in_pixels
)
{
// In order to produce repeatable rendering results,
// it is critical that TextureImageSuggestedMinimumSize be a
// constant and context independent value.
// As is clearly stated in the definition of ON_SubD::TextureImageSuggestedMinimumSize,
// this code assumes ON_SubD::TextureImageSuggestedMinimumSize is a power of 2 and
// ON_SubD::TextureImageSuggestedMinimumSize >= 512.
// As a result the following code assumes min_distance_in_pixels >= 8.0 and an integer value;
const double min_distance_in_pixels = ((double)(ON_SubD::TextureImageSuggestedMinimumSize))/64.0;
if (pack_rect_distance_in_pixels >= min_distance_in_pixels)
{
if (pack_rect_distance_in_pixels <= 2.0 * min_distance_in_pixels)
return 1.0;
if (pack_rect_distance_in_pixels <= 4.0 * min_distance_in_pixels)
return 2.0;
return 3.0;
}
return 0.0;
}
const ON_2udex ON_SubDFace::GetNgonSubPackRectSizeAndDelta(
unsigned int ngon_edge_count,
ON_2dVector ngon_face_pack_rect_size,
ON_2dVector& ngon_sub_pack_rect_size,
ON_2dVector& ngon_sub_pack_rect_delta
)
{
ON_2udex grid_size(0, 0);
ngon_sub_pack_rect_size = ON_2dVector::ZeroVector;
ngon_sub_pack_rect_delta = ON_2dVector::ZeroVector;
// This function determines how to partition ngon_face_pack_rect_size into
// ngon_edge_count sub quads that the ngon will use when it is rendered.
// Validate input parameters
if (ngon_edge_count < 5 || ngon_edge_count > ON_SubDFace::MaximumEdgeCount)
{
ON_SUBD_ERROR("Invalid ngon_edge_count parameter. Value must be >= 5 and <= ON_SubDFace::MaximumEdgeCount.");
return grid_size;
}
if (false == (ngon_face_pack_rect_size.x > 0.0 && ngon_face_pack_rect_size.x < ON_UNSET_POSITIVE_VALUE))
{
ON_SUBD_ERROR("Invalid ngon_face_pack_rect_size.x parameter. Value must be > 0.");
return grid_size;
}
if (false == (ngon_face_pack_rect_size.y > 0.0 && ngon_face_pack_rect_size.y < ON_UNSET_POSITIVE_VALUE))
{
ON_SUBD_ERROR("Invalid ngon_face_pack_rect_size.y parameter. Value must be > 0.");
return grid_size;
}
// The ngon's face pack rect will be partitioned into grid_size.i X grid_size.j sub pack rects.
const int pack_rect_aspectdex
= (ngon_face_pack_rect_size.x > ngon_face_pack_rect_size.y)
? 1
: ((ngon_face_pack_rect_size.x < ngon_face_pack_rect_size.y) ? -1 : 0)
;
grid_size = ON_SubD::TextureDomainGridSize(ngon_edge_count, 0.0, 0.0);
if (grid_size.i * grid_size.j < ngon_edge_count)
{
ON_SUBD_ERROR("Failed to get a valid grid_size.");
return ON_2udex(0, 0);
}
else
{
const int grid_aspectdex
= (grid_size.i > grid_size.j)
? 1
: ((grid_size.i < grid_size.j) ? -1 : 0)
;
if (grid_aspectdex * pack_rect_aspectdex < 0)
grid_size = ON_2udex(grid_size.j, grid_size.i);
}
// Estimate image pixels assigned to this ngon's pack rect.
// In order to produce repeatable rendering results,
// it is critical that TextureImageSuggestedMinimumSize be a
// constant and context independent value.
//
// The portion of the image assgned to the ngon face pack rect
// is rect_image_width X rect_image_height pixels.
// All variables ending in "size" have pixels as units.
const double subd_image_size = ON_SubD::TextureImageSuggestedMinimumSize;
const double rect_image_size[2] = {
subd_image_size * ngon_face_pack_rect_size.x,
subd_image_size * ngon_face_pack_rect_size.y
};
double subrect_image_size[2] = {
rect_image_size[0] / ((double)(grid_size.i)),
rect_image_size[1] / ((double)(grid_size.j))
};
double subrect_gap_size[2] = {
ON_SubDFace::PackRectGapInPixels(subrect_image_size[0]),
ON_SubDFace::PackRectGapInPixels(subrect_image_size[1])
};
// As is clearly stated in the definition of ON_SubD::TextureImageSuggestedMinimumSize,
// this code assumes ON_SubD::TextureImageSuggestedMinimumSize is a power of 2 and
// ON_SubD::TextureImageSuggestedMinimumSize >= 512.
// As a result the following code assumes min_distance_in_pixels >= 8.0 and an integer value;
//const double min_distance_in_pixels = ((double)(ON_SubD::TextureImageSuggestedMinimumSize)) / 64.0;
bool bApplyGap[2] = { false,false };
for (int i = 0; i < 2; ++i)
{
bApplyGap[i] = (subrect_gap_size[i] >= 1.0 && 8.0 * subrect_gap_size[i] <= subrect_image_size[i]);
if (bApplyGap[i])
subrect_image_size[i] = floor(subrect_image_size[i]) - subrect_gap_size[i];
}
// Dividing by subd_image_size converts pixel values to normalized dimensionless pack subrect values.
ngon_sub_pack_rect_size = ON_2dVector(
bApplyGap[0] ? (subrect_image_size[0] / subd_image_size) : (1.0 - ON_EPSILON) * (ngon_face_pack_rect_size.x / ((double)(grid_size.i))),
bApplyGap[1] ? (subrect_image_size[1] / subd_image_size) : (1.0 - ON_EPSILON) * (ngon_face_pack_rect_size.y / ((double)(grid_size.j)))
);
ngon_sub_pack_rect_delta = ON_2dVector(
ngon_sub_pack_rect_size.x + (bApplyGap[0] ? (subrect_gap_size[0] / subd_image_size) : 0.0),
ngon_sub_pack_rect_size.y + (bApplyGap[1] ? (subrect_gap_size[1] / subd_image_size) : 0.0)
);
return grid_size;
}
void ON_SubD::SetTextureCoordinateType(
ON_SubDTextureCoordinateType texture_coordinate_type
) const
{
const ON_SubDimple* subdimple = SubDimple();
if (nullptr != subdimple)
subdimple->SetTextureCoordinateType(texture_coordinate_type);
}
bool ON_SubD::TextureMappingRequired() const
{
if (ON_SubDTextureCoordinateType::FromMapping == TextureCoordinateType())
{
const ON_MappingTag texture_mapping_tag = TextureMappingTag(false);
if (
ON_TextureMapping::TYPE::no_mapping != texture_mapping_tag.m_mapping_type
&& ON_TextureMapping::TYPE::srfp_mapping != texture_mapping_tag.m_mapping_type
&& texture_mapping_tag.IsSet()
)
return true; // need an explicit ON_TextureMapping class to evaluate texture coordinates.
}
return false;
}
ON_SubDTextureCoordinateType ON_SubD::Internal_BestChoiceTextureCoordinateType(
const class ON_TextureMapping& available_mapping
) const
{
ON_SubDTextureCoordinateType subd_texture_coordinate_type = TextureCoordinateType();
if (ON_SubDTextureCoordinateType::FromMapping == subd_texture_coordinate_type)
{
const ON_MappingTag texture_mapping_tag = TextureMappingTag(false);
switch (texture_mapping_tag.m_mapping_type)
{
case ON_TextureMapping::TYPE::no_mapping:
subd_texture_coordinate_type = ON_SubDTextureCoordinateType::Unset;
break;
case ON_TextureMapping::TYPE::srfp_mapping:
subd_texture_coordinate_type = ON_SubDTextureCoordinateType::Packed; // <- breakpoint here when debugging texture issues
break;
default:
{
const bool bMappingAvailable
= ON_TextureMapping::TYPE::srfp_mapping != texture_mapping_tag.m_mapping_type
&& texture_mapping_tag.IsSet()
&& texture_mapping_tag.m_mapping_type == available_mapping.m_type
&& texture_mapping_tag.m_mapping_crc == available_mapping.MappingCRC()
;
if (false == bMappingAvailable)
subd_texture_coordinate_type = ON_SubDTextureCoordinateType::Unset; // <- breakpoint here when debugging texture issues
}
break;
}
}
if (ON_SubDTextureCoordinateType::Unset == subd_texture_coordinate_type)
subd_texture_coordinate_type = ON_SubD::DefaultTextureCoordinateType;
return subd_texture_coordinate_type;
}
bool ON_SubD::Internal_SetFragmentTextureCoordinatesWithoutMapping() const
{
// face_corners[] initialized to unpacked.
ON_SubDTextureCoordinateType subd_texture_coordinate_type = Internal_BestChoiceTextureCoordinateType(ON_TextureMapping::Unset);
bool bPacked = false;
bool bUnpacked = false;
bool bConstant = false;
bool bFromFaceTexturePoints = false;
ON_3dPoint face_corners[4];
switch (subd_texture_coordinate_type)
{
default:
// no break here
case ON_SubDTextureCoordinateType::FromMapping:
ON_SUBD_ERROR("Bug - these cases should have been eliminated in code above.");
subd_texture_coordinate_type = ON_SubDTextureCoordinateType::Packed;
// no break here
case ON_SubDTextureCoordinateType::Packed:
bPacked = true;
// If packing information is present, these values get updated for each face.
face_corners[0] = ON_3dPoint::NanPoint;
face_corners[1] = ON_3dPoint::NanPoint;
face_corners[2] = ON_3dPoint::NanPoint;
face_corners[3] = ON_3dPoint::NanPoint;
break;
case ON_SubDTextureCoordinateType::Unpacked:
bUnpacked = true;
// fragment grid order for unit texture corners
face_corners[0] = ON_3dPoint(0, 0, 0);
face_corners[1] = ON_3dPoint(1, 0, 0);
face_corners[2] = ON_3dPoint(0, 1, 0);
face_corners[3] = ON_3dPoint(1, 1, 0);
break;
case ON_SubDTextureCoordinateType::Zero:
bConstant = true;
face_corners[0] = ON_3dPoint::Origin;
face_corners[1] = ON_3dPoint::Origin;
face_corners[2] = ON_3dPoint::Origin;
face_corners[3] = ON_3dPoint::Origin;
break;
case ON_SubDTextureCoordinateType::Nan:
bConstant = true;
face_corners[0] = ON_3dPoint::NanPoint;
face_corners[1] = ON_3dPoint::NanPoint;
face_corners[2] = ON_3dPoint::NanPoint;
face_corners[3] = ON_3dPoint::NanPoint;
break;
case ON_SubDTextureCoordinateType::FromFaceTexturePoints:
bFromFaceTexturePoints = true;
face_corners[0] = ON_3dPoint::NanPoint;
face_corners[1] = ON_3dPoint::NanPoint;
face_corners[2] = ON_3dPoint::NanPoint;
face_corners[3] = ON_3dPoint::NanPoint;
break;
}
ON_SHA1_Hash hash = ON_SHA1_Hash::EmptyContentHash;
if (bPacked || bUnpacked || bConstant || bFromFaceTexturePoints)
{
ON_SubDFaceIterator fit(*this);
// DELETE // // estimate face image size - used to add empty space around ngon-subdfragments
// DELETE // const unsigned int face_image_size = ON_SubD::TextureImageSuggestedMinimumSize(ON_SubD::TextureDomainGridSize(fit.FaceCount(), 0, 0));
for (const ON_SubDFace* f = fit.FirstFace(); nullptr != f; f = fit.NextFace())
{
if (f->m_edge_count < 3)
continue;
const ON_SubDMeshFragment* fragment = f->MeshFragments();
if (nullptr == fragment)
continue;
const unsigned short frag_count = (4 == f->m_edge_count) ? 1 : f->m_edge_count;
if (bUnpacked || bConstant)
{
for (unsigned short frag_dex = 0; frag_dex < frag_count && nullptr != fragment; ++frag_dex, fragment = fragment->m_next_fragment)
fragment->SetTextureCoordinateCornersForExperts(true, face_corners, true);
continue;
}
if (bFromFaceTexturePoints && f->TexturePointsAreSet())
{
// All the code in this if clause handles setting custom texture coordinates.
ON_3dPoint frag_texture_corners[4];
if (1 == frag_count)
{
// f is a quad face and there is one fragment
frag_texture_corners[0] = f->TexturePoint(0);
frag_texture_corners[1] = f->TexturePoint(1);
frag_texture_corners[2] = f->TexturePoint(2);
frag_texture_corners[3] = f->TexturePoint(3);
fragment->SetTextureCoordinateCornersForExperts(false, frag_texture_corners, true);
}
else if ( frag_count >= 3)
{
// f is a n-gon with n subd fragments
const int k = 2;
frag_texture_corners[(2 + k) % 4] = f->TextureCenterPoint();
ON_Line L(f->TexturePoint(f->m_edge_count - 1), f->TexturePoint(0));
frag_texture_corners[(1 + k) % 4] = L.PointAt(0.5);
for (unsigned short frag_dex = 0; frag_dex < frag_count && nullptr != fragment; ++frag_dex, fragment = fragment->m_next_fragment)
{
L.from = L.to;
L.to = f->TexturePoint((frag_dex + 1) % frag_count);
frag_texture_corners[(3 + k) % 4] = frag_texture_corners[(1 + k) % 4];
frag_texture_corners[(0 + k) % 4] = L.from;
frag_texture_corners[(1 + k) % 4] = L.PointAt(0.5);
fragment->SetTextureCoordinateCornersForExperts(false, frag_texture_corners, true);
}
}
continue;
}
// The remaining code in this scope handles setting packed texture coordinates on face fragments.
// We end up here when bPacked or a face is missing texture points.
if (f->PackRectIsSet())
{
// even when bPacked is false, use packed coordinates as a fallback
face_corners[0] = f->PackRectCorner(true, 0);
face_corners[1] = f->PackRectCorner(true, 1);
face_corners[2] = f->PackRectCorner(true, 2);
face_corners[3] = f->PackRectCorner(true, 3);
}
else
{
face_corners[0] = ON_2dPoint::NanPoint;
face_corners[1] = ON_2dPoint::NanPoint;
face_corners[2] = ON_2dPoint::NanPoint;
face_corners[3] = ON_2dPoint::NanPoint;
}
if (1 == frag_count || 3 == frag_count)
{
// A quad ON_SubDFace has a single fragment and that fragment gets the entire face_texture_domain
// A 3-gon ON_SubDFace has 3 fragments that get a portion of the entire face_texture_domain
for (unsigned short frag_dex = 0; frag_dex < frag_count && nullptr != fragment; ++frag_dex, fragment = fragment->m_next_fragment)
fragment->SetQuadOr3gonFaceFragmentTextureCoordinateCorners(true, face_corners, true);
}
else if (frag_count >= 5)
{
// A n-gon ON_SubDFace (n has n fragments that get a portion of the entire face_texture_domain
// General case n-gon with n >= 5.
// This face in an n-gon with n fragments that each get a portion of the
// texture domain assigned to the face.
const ON_2dVector face_pack_rect_size = f->PackRectIsSet() ? f->PackRectSize() : ON_2dVector(1.0, 1.0);
ON_2dVector ngon_sub_pack_rect_size = ON_2dVector::NanVector;
ON_2dVector ngon_sub_pack_rect_delta = ON_2dVector::NanVector;
const ON_2udex ngon_grid_size = ON_SubDFace::GetNgonSubPackRectSizeAndDelta(
frag_count,
face_pack_rect_size,
ngon_sub_pack_rect_size,
ngon_sub_pack_rect_delta
);
for (unsigned short frag_dex = 0; frag_dex < frag_count && nullptr != fragment; ++frag_dex, fragment = fragment->m_next_fragment)
fragment->SetNgonFaceFragmentTextureCoordinateCorners(true, face_corners, face_pack_rect_size, ngon_grid_size, ngon_sub_pack_rect_size, ngon_sub_pack_rect_delta, true);
}
}
hash = ON_SubD::TextureSettingsHash(subd_texture_coordinate_type, ON_MappingTag::Unset);
ChangeRenderContentSerialNumber();
}
Internal_SetFragmentTextureCoordinatesTextureSettingsHash(hash);
return true;
}
void ON_SubD::SetTextureMappingTag(const ON_MappingTag &mapping_tag) const
{
const ON_SubDimple* subdimple = SubDimple();
if (nullptr != subdimple)
subdimple->SetTextureMappingTag(mapping_tag);
}
void ON_SubD::ClearFragmentTextureCoordinatesTextureSettingsHash() const
{
Internal_SetFragmentTextureCoordinatesTextureSettingsHash(ON_SHA1_Hash::EmptyContentHash);
}
static bool SetGridMeshMappingTCs(const unsigned int pointCount, const double* P, const size_t P_stride, const double* N, const size_t N_stride, double* T, const size_t T_stride, const ON_TextureMapping& mapping, const ON_Xform* P_xform, const ON_Xform* N_xform)
{
return false;
}
bool ON_SubD::SetFragmentTextureCoordinates(
const class ON_TextureMapping& mapping,
bool bLazy
) const
{
const ON_SubDTextureCoordinateType subd_texture_coordinate_type = Internal_BestChoiceTextureCoordinateType(mapping);
const ON_MappingTag mapping_tag = this->TextureMappingTag(false);
const ON_SHA1_Hash hash = ON_SubD::TextureSettingsHash(subd_texture_coordinate_type, mapping_tag);
if (bLazy)
{
// fragment texture coordinates match what's be asked for.
const ON_SHA1_Hash current_hash = FragmentTextureCoordinatesTextureSettingsHash();
if (hash == current_hash)
return true;
}
if (ON_SubDTextureCoordinateType::FromMapping != subd_texture_coordinate_type || false == this->TextureMappingRequired())
return Internal_SetFragmentTextureCoordinatesWithoutMapping();
// we have a valid and nontrivial mapping.
const ON_Xform subd_xform(mapping_tag.Transform());
const bool bApplySubDXform = ON_MappingTag::TransformTreatedIsIdentity(&subd_xform) ? false : true;
ON_Xform P_xform, N_xform;
if (bApplySubDXform)
subd_xform.GetMappingXforms(P_xform, N_xform);
ON_3dPoint tc;
ON_SubDMeshFragmentIterator frit(*this);
for (const ON_SubDMeshFragment* fragment = frit.FirstFragment(); nullptr != fragment; fragment = frit.NextFragment())
{
const unsigned P_count = fragment->PointCount();
if (P_count < 4)
continue;
const double* P = fragment->m_P;
const size_t P_stride = fragment->m_P_stride;
unsigned T_count = fragment->TextureCoordinateCount();
if (P_count != T_count)
continue;
double* T = fragment->m_T;
if (nullptr == T)
continue;
size_t T_stride = fragment->m_T_stride;
if (0 == T_stride)
{
T_stride = 3;
T_count = 1;
}
const unsigned N_count = fragment->NormalCount();
const double* N = (N_count == P_count) ? fragment->m_N : &ON_3dVector::ZeroVector.x;
const size_t N_stride = (N_count == P_count) ? fragment->m_N_stride : 0;
if (T_count != P_count || N_count != P_count || !SetGridMeshMappingTCs(P_count, P, P_stride, N, N_stride, T, T_stride, mapping, bApplySubDXform ? &P_xform : nullptr, bApplySubDXform ? &N_xform : nullptr))
{
for (double* T1 = T + T_stride * T_count; T < T1; T += T_stride, P += P_stride, N += N_stride)
{
const bool ok = bApplySubDXform ?
mapping.Evaluate(ON_3dPoint(P), ON_3dVector(N), &tc, P_xform, N_xform) :
mapping.Evaluate(ON_3dPoint(P), ON_3dVector(N), &tc);
if (!ok)
tc = ON_3dPoint::NanPoint;
T[0] = tc.x;
T[1] = tc.y;
T[2] = tc.z;
}
}
}
Internal_SetFragmentTextureCoordinatesTextureSettingsHash(hash);
return true;
}
void ON_SubD::Internal_SetFragmentTextureCoordinatesTextureSettingsHash(ON_SHA1_Hash hash) const
{
const ON_SubDimple* subdimple = SubDimple();
if (nullptr != subdimple)
subdimple->Internal_SetFragmentTextureCoordinatesTextureSettingsHash(hash);
}
const ON_SHA1_Hash ON_SubD::FragmentTextureCoordinatesTextureSettingsHash() const
{
const ON_SubDimple* subdimple = SubDimple();
return (nullptr != subdimple) ? subdimple->FragmentTextureCoordinatesTextureSettingsHash() : ON_SHA1_Hash::EmptyContentHash;
}
const ON_MappingTag ON_SubD::TextureMappingTag(bool bIgnoreTextureCoordinateType) const
{
const ON_SubDimple* subdimple = SubDimple();
return (nullptr != subdimple) ? subdimple->TextureMappingTag(bIgnoreTextureCoordinateType) : ON_MappingTag();
}
const ON_SHA1_Hash ON_SubD::TextureSettingsHash(ON_SubDTextureCoordinateType texture_coordinate_type, const ON_MappingTag& texture_mapping_tag)
{
bool bHashMapping = false;
switch (texture_coordinate_type)
{
case ON_SubDTextureCoordinateType::Unset:
break;
case ON_SubDTextureCoordinateType::Unpacked:
break;
case ON_SubDTextureCoordinateType::Packed:
break;
case ON_SubDTextureCoordinateType::Zero:
break;
case ON_SubDTextureCoordinateType::Nan:
break;
case ON_SubDTextureCoordinateType::FromFaceTexturePoints:
break;
case ON_SubDTextureCoordinateType::FromMapping:
switch (texture_mapping_tag.m_mapping_type)
{
case ON_TextureMapping::TYPE::no_mapping:
texture_coordinate_type = ON_SubD::DefaultTextureCoordinateType;
break;
case ON_TextureMapping::TYPE::srfp_mapping:
texture_coordinate_type = ON_SubDTextureCoordinateType::Packed;
break;
default:
if (texture_mapping_tag.IsSet())
bHashMapping = true;
else
texture_coordinate_type = ON_SubD::DefaultTextureCoordinateType;
break;
}
break;
default:
ON_SUBD_ERROR("Invalid texture_coordinate_type parameter");
texture_coordinate_type = ON_SubDTextureCoordinateType::Unset;
break;
}
ON_SHA1 sha1;
sha1.AccumulateBytes(&texture_coordinate_type, sizeof(texture_coordinate_type)); // 1 byte
if (bHashMapping)
sha1.AccumulateSubHash(texture_mapping_tag.Hash());
return sha1.Hash();
}
const ON_SHA1_Hash ON_SubD::TextureSettingsHash() const
{
return ON_SubD::TextureSettingsHash(this->TextureCoordinateType(), this->TextureMappingTag(false));
}
#pragma endregion
#endif
//////////////////////////////////////////////////////////////////////////////
//
// ON_SubDFace - texture coordinates
//
void ON_SubDFace::SetMaterialChannelIndex(int material_channel_index) const
{
if ( material_channel_index > 0 && material_channel_index <= ON_Material::MaximumMaterialChannelIndex )
{
m_material_channel_index = (unsigned short)material_channel_index;
}
else
{
if (0 != material_channel_index)
{
ON_ERROR("Invalid material_channel_index value.");
}
ClearMaterialChannelIndex(); // makes it easier to detect when per face setting is cleared.
}
}
void ON_SubDFace::ClearMaterialChannelIndex() const
{
m_material_channel_index = 0;
}
int ON_SubDFace::MaterialChannelIndex() const
{
return (int)m_material_channel_index;
}
void ON_SubDFace::SetPerFaceColor(
ON_Color color
) const
{
if (ON_Color::UnsetColor == color)
ClearPerFaceColor(); // makes it easier to detect when the per face setting is cleared.
else
m_per_face_color = color;
}
void ON_SubDFace::ClearPerFaceColor() const
{
m_per_face_color = ON_Color::UnsetColor;
}
const ON_Color ON_SubDFace::PerFaceColor() const
{
return m_per_face_color;
}
unsigned int ON_SubD::ClearPerFaceMaterialChannelIndices()
{
unsigned change_count = 0;
ON_SubDFaceIterator fit(*this);
for (const ON_SubDFace* f = fit.FirstFace(); nullptr != f; f = fit.NextFace())
{
if (0 != f->MaterialChannelIndex())
{
f->ClearMaterialChannelIndex();
++change_count;
}
}
if (change_count>0)
ChangeRenderContentSerialNumber();
return change_count;
}
bool ON_SubD::HasPerFaceMaterialChannelIndices() const
{
ON_SubDFaceIterator fit(*this);
for (const ON_SubDFace* f = fit.FirstFace(); nullptr != f; f = fit.NextFace())
{
if (0 != f->MaterialChannelIndex())
return true;
}
return false;
}
unsigned int ON_SubD::ClearPerFaceColors() const
{
unsigned change_count = 0;
ON_SubDFaceIterator fit(*this);
for (const ON_SubDFace* f = fit.FirstFace(); nullptr != f; f = fit.NextFace())
{
if (ON_Color::UnsetColor != f->PerFaceColor())
{
f->ClearPerFaceColor();
++change_count;
}
}
if (change_count > 0)
ChangeRenderContentSerialNumber();
return change_count;
}
bool ON_SubD::HasPerFaceColors() const
{
ON_SubDFaceIterator fit(*this);
for (const ON_SubDFace* f = fit.FirstFace(); nullptr != f; f = fit.NextFace())
{
if (ON_Color::UnsetColor != f->PerFaceColor())
return true;
}
return false;
}
void ON_SubD::SetPerFaceColorsFromPackId() const
{
if (FaceCount() <= 0)
return;
ON_SubDFaceIterator fit(*this);
for (const ON_SubDFace* f = fit.FirstFace(); nullptr != f; f = fit.NextFace())
{
const unsigned pack_id = f->PackId();
if (0 == pack_id)
f->ClearPerFaceColor();
else
f->SetPerFaceColor(ON_Color::RandomColor(pack_id));
}
ChangeRenderContentSerialNumber(); // face color changes.
}
bool ON_SubD::HasPerFaceColorsFromPackId() const
{
ON_SubDFaceIterator fit(*this);
const ON_SubDFace* f = fit.FirstFace();
if (nullptr == f)
return false;
bool bHasPerFaceColorsFromPackId = false;
for (/*empty init*/; nullptr != f; f = fit.NextFace())
{
const ON_Color f_color = f->PerFaceColor();
if (((unsigned int)f_color) == ((unsigned int)ON_Color::UnsetColor))
continue;
const unsigned pack_id = f->PackId();
const ON_Color pack_id_color
= (0 == pack_id)
? ON_Color::UnsetColor
: ON_Color::RandomColor(pack_id);
if (((unsigned int)pack_id_color) != ((unsigned int)f_color))
return false;
bHasPerFaceColorsFromPackId = true;
}
return bHasPerFaceColorsFromPackId;
}
void ON_SubD::SetComponentMarkBitsFromSymmetryMotif() const
{
this->ClearComponentMarkBits(true, true, true);
}
void ON_SubD::SetPerFaceColorsFromSymmetryMotif() const
{
if (FaceCount() < 1)
return;
this->ClearPerFaceColors();
ChangeRenderContentSerialNumber(); // face color changes.
}
bool ON_SubD::HasPerFaceColorsFromSymmetryMotif() const
{
return false;
}
//////////////////////////////////////////////////////////////////////////////
//
// ON_SubDMeshFragment - texture coordinates
//
#if 1
#pragma region ON_SubDMeshFragment - texture coordinates
bool ON_SubDMeshFragment::TextureCoordinatesExist() const
{
return (0 != (m_vertex_count_etc & ON_SubDMeshFragment::EtcTextureCoordinatesExistBit));
}
void ON_SubDMeshFragment::SetTextureCoordinatesExist(bool bTextureCoordinatesExist) const
{
if (bTextureCoordinatesExist)
m_vertex_count_etc |= ON_SubDMeshFragment::EtcTextureCoordinatesExistBit;
else
m_vertex_count_etc &= ~ON_SubDMeshFragment::EtcTextureCoordinatesExistBit;
}
unsigned int ON_SubDMeshFragment::TextureCoordinateCount() const
{
return (TextureCoordinatesExist() && nullptr != m_T && (0 == m_T_stride || m_T_stride >= 3)) ? VertexCount() : 0U;
}
unsigned int ON_SubDMeshFragment::TextureCoordinateCapacity() const
{
return (nullptr != m_T && m_T_stride >= 3) ? VertexCapacity() : 0U;
}
const double* ON_SubDMeshFragment::TextureCoordinateArray(ON_SubDComponentLocation subd_appearance)const
{
return (ON_SubDComponentLocation::ControlNet == subd_appearance) ? &m_ctrlnetT[0][0] : m_T;
}
size_t ON_SubDMeshFragment::TextureCoordinateArrayStride(ON_SubDComponentLocation subd_appearance)const
{
return (ON_SubDComponentLocation::ControlNet == subd_appearance) ? 3 : m_T_stride;
}
unsigned ON_SubDMeshFragment::TextureCoordinateArrayCount(ON_SubDComponentLocation subd_appearance) const
{
return (ON_SubDComponentLocation::ControlNet == subd_appearance) ? (TextureCoordinatesExist()?4U:0U) : TextureCoordinateCount();
}
bool ON_SubDMeshFragment::GetTextureCoordinteCorners(
bool bGridOrder,
ON_3dPoint texture_coordinate_coeners[4]
) const
{
// mutable double m_T_default_bbox[2][2];
if (nullptr != texture_coordinate_coeners)
{
int i;
texture_coordinate_coeners[0].x = m_ctrlnetT[0][0];
texture_coordinate_coeners[0].y = m_ctrlnetT[0][1];
texture_coordinate_coeners[0].z = m_ctrlnetT[0][2];
texture_coordinate_coeners[1].x = m_ctrlnetT[1][0];
texture_coordinate_coeners[1].y = m_ctrlnetT[1][1];
texture_coordinate_coeners[1].z = m_ctrlnetT[1][2];
i = bGridOrder ? 2 : 3;
texture_coordinate_coeners[i].x = m_ctrlnetT[2][0];
texture_coordinate_coeners[i].y = m_ctrlnetT[2][1];
texture_coordinate_coeners[i].z = m_ctrlnetT[2][2];
i = bGridOrder ? 3 : 2;
texture_coordinate_coeners[i].x = m_ctrlnetT[3][0];
texture_coordinate_coeners[i].y = m_ctrlnetT[3][1];
texture_coordinate_coeners[i].z = m_ctrlnetT[3][2];
return true;
}
return false;
}
static const ON_2dPoint Internal_NgonFragmentPackRectCorner(
bool bGridOrder,
const ON_2dPoint face_pack_rect_corners[4],
double s,
double t
)
{
// used for 3-gons and for n-gons with n >= 5
return (1.0 - s) * (1.0 - t) * face_pack_rect_corners[0] + s * (1.0 - t) * face_pack_rect_corners[1] + (1.0 - s) * t * face_pack_rect_corners[bGridOrder ? 2 : 3] + s * t * face_pack_rect_corners[bGridOrder ? 3 : 2];
}
static const ON_3dPoint Internal_NgonFragmentTextureCoordinateCorner(
bool bGridOrder,
const ON_3dPoint face_texture_coordinate_corners[4],
double s,
double t
)
{
// used for 3-gons and for n-gons with n >= 5
return (1.0 - s) * (1.0 - t) * face_texture_coordinate_corners[0] + s * (1.0 - t) * face_texture_coordinate_corners[1] + (1.0 - s) * t * face_texture_coordinate_corners[bGridOrder ? 2 : 3] + s * t * face_texture_coordinate_corners[bGridOrder ? 3 : 2];
}
void ON_SubDMeshFragment::SetPackRectCornersForExperts(
bool bGridOrder,
const ON_2dPoint pack_rect_corners[4]
)
{
if (nullptr != pack_rect_corners)
{
// m_ctrlnetT[] is in grid order.
// lower left
m_pack_rect[0][0] = pack_rect_corners[0].x;
m_pack_rect[0][1] = pack_rect_corners[0].y;
// lower right
m_pack_rect[1][0] = pack_rect_corners[1].x;
m_pack_rect[1][1] = pack_rect_corners[1].y;
// upper left
int i = bGridOrder ? 2 : 3;
m_pack_rect[2][0] = pack_rect_corners[i].x;
m_pack_rect[2][1] = pack_rect_corners[i].y;
// upper right
i = bGridOrder ? 3 : 2;
m_pack_rect[3][0] = pack_rect_corners[i].x;
m_pack_rect[3][1] = pack_rect_corners[i].y;
}
}
void ON_SubDMeshFragment::SetQuadOr3gonFaceFragmentTextureCoordinateCorners(
bool bGridOrder,
const ON_3dPoint face_texture_coordinate_corners[4],
bool bSetTextureCoordinates
) const
{
if (1 == m_face_fragment_count && 0 == m_face_fragment_index)
{
// A quad ON_SubDFace is rendered with one ON_SubDMeshFragments.
SetTextureCoordinateCornersForExperts(bGridOrder, face_texture_coordinate_corners, bSetTextureCoordinates);
}
else
{
ON_3dPoint fragment_corners[4];
if (3 == m_face_fragment_count)
{
// A 3-gon ON_SubDFace is rendered with three ON_SubDMeshFragments.
// The pack rect assigned to the face is divided into quarters and
// 3 of those quarters are assigned to the 3-gon fragments
// in a continuous manner.
const int i2 = bGridOrder ? 2 : 3;
const int i3 = bGridOrder ? 3 : 2;
fragment_corners[0] = ON_3dPoint::Midpoint(
ON_3dPoint::Midpoint(face_texture_coordinate_corners[0], face_texture_coordinate_corners[1]),
ON_3dPoint::Midpoint(face_texture_coordinate_corners[i2], face_texture_coordinate_corners[i3])
);
switch (m_face_fragment_index)
{
case 0:
// fragment_corners[] in counter-clockwise order for 3-gon's 1st fragment
fragment_corners[1] = ON_3dPoint::Midpoint(face_texture_coordinate_corners[0], face_texture_coordinate_corners[i2]);
fragment_corners[2] = face_texture_coordinate_corners[0];
fragment_corners[3] = ON_3dPoint::Midpoint(face_texture_coordinate_corners[0], face_texture_coordinate_corners[1]);
break;
case 1:
// fragment_corners[] in counter-clockwise order for 3-gon's 2nd fragment in
fragment_corners[1] = ON_3dPoint::Midpoint(face_texture_coordinate_corners[0], face_texture_coordinate_corners[1]);
fragment_corners[2] = face_texture_coordinate_corners[1];
fragment_corners[3] = ON_3dPoint::Midpoint(face_texture_coordinate_corners[1], face_texture_coordinate_corners[i3]);
break;
case 2:
// fragment_corners[] in counter-clockwise order for 3-gon's 3rd fragment
fragment_corners[1] = ON_3dPoint::Midpoint(face_texture_coordinate_corners[1], face_texture_coordinate_corners[i3]);
fragment_corners[2] = face_texture_coordinate_corners[i3];
fragment_corners[3] = ON_3dPoint::Midpoint(face_texture_coordinate_corners[i2], face_texture_coordinate_corners[i3]);
break;
default:
ON_SUBD_ERROR("Invalid m_face_fragment_index value");
fragment_corners[0] = ON_3dPoint::NanPoint;
fragment_corners[1] = ON_3dPoint::NanPoint;
fragment_corners[2] = ON_3dPoint::NanPoint;
fragment_corners[3] = ON_3dPoint::NanPoint;
break;
}
}
else
{
// n-gon with n >= 5 or ininitialized m_face_fragment_count.
// If m_face_fragment_count >= 5, then you should be calling SetNgonFaceFragmentTextureCoordinateCorners().
ON_SUBD_ERROR("Invalid m_face_fragment_count value");
fragment_corners[0] = ON_3dPoint::NanPoint;
fragment_corners[1] = ON_3dPoint::NanPoint;
fragment_corners[2] = ON_3dPoint::NanPoint;
fragment_corners[3] = ON_3dPoint::NanPoint;
}
SetTextureCoordinateCornersForExperts(false, fragment_corners, true);
}
}
bool ON_SubDFace::GetMeshFragmentPackRectCorners(
bool bGridOrder,
unsigned int fragment_index,
ON_2dPoint mesh_fragment_pack_rect_corners[4]
) const
{
if (nullptr == mesh_fragment_pack_rect_corners)
return true; // confused caller
if (fragment_index >= ( (4 == m_edge_count) ? 1U : ((unsigned)m_edge_count) ) )
{
return ON_SUBD_RETURN_ERROR(false);
}
if (PackRectIsSet())
{
switch (m_edge_count)
{
case 0:
case 1:
case 2:
mesh_fragment_pack_rect_corners[0] = ON_2dPoint::NanPoint;
mesh_fragment_pack_rect_corners[1] = ON_2dPoint::NanPoint;
mesh_fragment_pack_rect_corners[2] = ON_2dPoint::NanPoint;
mesh_fragment_pack_rect_corners[3] = ON_2dPoint::NanPoint;
return false;
break;
case 3: // triangle
{
// A 3-gon ON_SubDFace is rendered with three ON_SubDMeshFragments.
// The pack rect assigned to the face is divided into quarters and
// 3 of those quarters are assigned to the 3-gon fragments
// in a continuous manner.
const ON_2dPoint face_pack_rect_corners[4] =
{
PackRectCorner(bGridOrder, 0),
PackRectCorner(bGridOrder, 1),
PackRectCorner(bGridOrder, 2),
PackRectCorner(bGridOrder, 3)
};
const int i2 = bGridOrder ? 2 : 3;
const int i3 = bGridOrder ? 3 : 2;
mesh_fragment_pack_rect_corners[0] = ON_2dPoint::Midpoint(
ON_2dPoint::Midpoint(face_pack_rect_corners[0], face_pack_rect_corners[1]),
ON_2dPoint::Midpoint(face_pack_rect_corners[i2], face_pack_rect_corners[i3])
);
switch (fragment_index)
{
case 0:
// mesh_fragment_pack_rect_corners[] in counter-clockwise order for 3-gon's 1st fragment
mesh_fragment_pack_rect_corners[1] = ON_2dPoint::Midpoint(face_pack_rect_corners[0], face_pack_rect_corners[i2]);
mesh_fragment_pack_rect_corners[i2] = face_pack_rect_corners[0];
mesh_fragment_pack_rect_corners[i3] = ON_2dPoint::Midpoint(face_pack_rect_corners[0], face_pack_rect_corners[1]);
break;
case 1:
// mesh_fragment_pack_rect_corners[] in counter-clockwise order for 3-gon's 2nd fragment in
mesh_fragment_pack_rect_corners[1] = ON_2dPoint::Midpoint(face_pack_rect_corners[0], face_pack_rect_corners[1]);
mesh_fragment_pack_rect_corners[i2] = face_pack_rect_corners[1];
mesh_fragment_pack_rect_corners[i3] = ON_2dPoint::Midpoint(face_pack_rect_corners[1], face_pack_rect_corners[i3]);
break;
case 2:
// mesh_fragment_pack_rect_corners[] in counter-clockwise order for 3-gon's 3rd fragment
mesh_fragment_pack_rect_corners[1] = ON_2dPoint::Midpoint(face_pack_rect_corners[1], face_pack_rect_corners[i3]);
mesh_fragment_pack_rect_corners[i2] = face_pack_rect_corners[i3];
mesh_fragment_pack_rect_corners[i3] = ON_2dPoint::Midpoint(face_pack_rect_corners[i2], face_pack_rect_corners[i3]);
break;
}
}
return true;
break;
case 4: // quad
return this->GetFacePackRectCorners(bGridOrder,mesh_fragment_pack_rect_corners);
break;
default: // n-gon with n >= 5
{
// An n-gon ON_SubDFace is rendered with n ON_SubDMeshFragments.
ON_2dPoint face_pack_rect_corners[4];
if (this->GetFacePackRectCorners(bGridOrder, face_pack_rect_corners))
{
const ON_2dVector face_pack_rect_size = this->PackRectSize();
ON_2dVector ngon_sub_pack_rect_size;
ON_2dVector ngon_sub_pack_rect_delta;
const ON_2udex ngon_grid_size = ON_SubDFace::GetNgonSubPackRectSizeAndDelta(
m_edge_count,
face_pack_rect_size,
ngon_sub_pack_rect_size,
ngon_sub_pack_rect_delta
);
if (ngon_grid_size.i > 0 && ngon_grid_size.j > 0 && ON_SubDMeshFragment::GetNgonFaceFragmentPackRectCorners(
m_edge_count,
fragment_index,
bGridOrder,
face_pack_rect_corners,
face_pack_rect_size,
ngon_grid_size,
ngon_sub_pack_rect_size,
ngon_sub_pack_rect_delta,
mesh_fragment_pack_rect_corners
))
{
return true;
}
}
}
break;
}
}
mesh_fragment_pack_rect_corners[0] = ON_2dPoint::NanPoint;
mesh_fragment_pack_rect_corners[1] = ON_2dPoint::NanPoint;
mesh_fragment_pack_rect_corners[2] = ON_2dPoint::NanPoint;
mesh_fragment_pack_rect_corners[3] = ON_2dPoint::NanPoint;
return false;
}
static const ON_2dPoint Internal_PackRectCenterPoint(
const ON_2dPoint face_pack_rect_corners[4]
)
{
// This code works for face_pack_rect_corners[] in either grid order or counter clockwise order
// because swapping 2 and 3 does not change the result.
return ON_2dPoint::Midpoint(
ON_2dPoint::Midpoint(face_pack_rect_corners[0], face_pack_rect_corners[1]),
ON_2dPoint::Midpoint(face_pack_rect_corners[2], face_pack_rect_corners[3])
);
}
bool ON_SubDMeshFragment::Get3gonFaceFragmentPackRectCorners(
bool bFaceGridOrder,
const ON_2dPoint face_pack_rect_corners[4],
unsigned int fragment_index,
bool bFragmentGridOrder,
ON_2dPoint fragment_pack_rect_corners[4])
{
fragment_pack_rect_corners[0] = Internal_PackRectCenterPoint(face_pack_rect_corners);
// A 3-gon ON_SubDFace is rendered with three ON_SubDMeshFragments.
// The pack rect assigned to the face is divided into quarters and
// 3 of those quarters are assigned to the 3-gon fragments
// in a continuous manner.
const int i2 = bFaceGridOrder ? 2 : 3;
const int i3 = bFaceGridOrder ? 3 : 2;
const int j2 = bFragmentGridOrder ? 3 : 2;
const int j3 = bFragmentGridOrder ? 2 : 3;
fragment_pack_rect_corners[0] = Internal_PackRectCenterPoint(face_pack_rect_corners);
bool rc = true;
switch (fragment_index)
{
case 0:
// fragment_pack_rect_corners[] in counter-clockwise order for 3-gon's 1st fragment
fragment_pack_rect_corners[1] = ON_2dPoint::Midpoint(face_pack_rect_corners[0], face_pack_rect_corners[i2]);
fragment_pack_rect_corners[j2] = face_pack_rect_corners[0];
fragment_pack_rect_corners[j3] = ON_2dPoint::Midpoint(face_pack_rect_corners[0], face_pack_rect_corners[1]);
break;
case 1:
// fragment_pack_rect_corners[] in counter-clockwise order for 3-gon's 2nd fragment in
fragment_pack_rect_corners[1] = ON_2dPoint::Midpoint(face_pack_rect_corners[0], face_pack_rect_corners[1]);
fragment_pack_rect_corners[j2] = face_pack_rect_corners[1];
fragment_pack_rect_corners[j3] = ON_2dPoint::Midpoint(face_pack_rect_corners[1], face_pack_rect_corners[i3]);
break;
case 2:
// fragment_pack_rect_corners[] in counter-clockwise order for 3-gon's 3rd fragment
fragment_pack_rect_corners[1] = ON_2dPoint::Midpoint(face_pack_rect_corners[1], face_pack_rect_corners[i3]);
fragment_pack_rect_corners[j2] = face_pack_rect_corners[i3];
fragment_pack_rect_corners[j3] = ON_2dPoint::Midpoint(face_pack_rect_corners[i2], face_pack_rect_corners[i3]);
break;
default:
ON_SUBD_ERROR("Invalid m_face_fragment_index value");
fragment_pack_rect_corners[0] = ON_2dPoint::NanPoint;
fragment_pack_rect_corners[1] = ON_2dPoint::NanPoint;
fragment_pack_rect_corners[2] = ON_2dPoint::NanPoint;
fragment_pack_rect_corners[3] = ON_2dPoint::NanPoint;
rc = false;
break;
}
return rc;
}
void ON_SubDMeshFragment::SetQuadOr3gonFaceFragmentPackRectCorners(
bool bGridOrder,
const ON_2dPoint face_pack_rect_corners[4]
)
{
if (1 == m_face_fragment_count && 0 == m_face_fragment_index)
{
// A quad ON_SubDFace is rendered with one ON_SubDMeshFragments.
SetPackRectCornersForExperts(bGridOrder, face_pack_rect_corners);
}
else
{
ON_2dPoint fragment_corners[4];
if (3 == m_face_fragment_count)
{
// A 3-gon ON_SubDFace is rendered with three ON_SubDMeshFragments.
// The pack rect assigned to the face is divided into quarters and
// 3 of those quarters are assigned to the 3-gon fragments
// in a continuous manner.
const int i2 = bGridOrder ? 2 : 3;
const int i3 = bGridOrder ? 3 : 2;
fragment_corners[0] = Internal_PackRectCenterPoint(face_pack_rect_corners);
switch (m_face_fragment_index)
{
case 0:
// fragment_corners[] in counter-clockwise order for 3-gon's 1st fragment
fragment_corners[1] = ON_2dPoint::Midpoint(face_pack_rect_corners[0], face_pack_rect_corners[i2]);
fragment_corners[2] = face_pack_rect_corners[0];
fragment_corners[3] = ON_2dPoint::Midpoint(face_pack_rect_corners[0], face_pack_rect_corners[1]);
break;
case 1:
// fragment_corners[] in counter-clockwise order for 3-gon's 2nd fragment in
fragment_corners[1] = ON_2dPoint::Midpoint(face_pack_rect_corners[0], face_pack_rect_corners[1]);
fragment_corners[2] = face_pack_rect_corners[1];
fragment_corners[3] = ON_2dPoint::Midpoint(face_pack_rect_corners[1], face_pack_rect_corners[i3]);
break;
case 2:
// fragment_corners[] in counter-clockwise order for 3-gon's 3rd fragment
fragment_corners[1] = ON_2dPoint::Midpoint(face_pack_rect_corners[1], face_pack_rect_corners[i3]);
fragment_corners[2] = face_pack_rect_corners[i3];
fragment_corners[3] = ON_2dPoint::Midpoint(face_pack_rect_corners[i2], face_pack_rect_corners[i3]);
break;
default:
ON_SUBD_ERROR("Invalid m_face_fragment_index value");
fragment_corners[0] = ON_2dPoint::NanPoint;
fragment_corners[1] = ON_2dPoint::NanPoint;
fragment_corners[2] = ON_2dPoint::NanPoint;
fragment_corners[3] = ON_2dPoint::NanPoint;
break;
}
}
else
{
// n-gon with n >= 5 or ininitialized m_face_fragment_count.
// If m_face_fragment_count >= 5, then you should be calling SetNgonFaceFragmentPackRectCorners().
ON_SUBD_ERROR("Invalid m_face_fragment_count value");
fragment_corners[0] = ON_2dPoint::NanPoint;
fragment_corners[1] = ON_2dPoint::NanPoint;
fragment_corners[2] = ON_2dPoint::NanPoint;
fragment_corners[3] = ON_2dPoint::NanPoint;
}
SetPackRectCornersForExperts(false, fragment_corners);
}
}
static double Internal_ClampBetweenZeroAndOne(double x)
{
if (x < 0.0)
return 0.0;
if (x > 1.0)
return 1.0;
return x;
}
void ON_SubDMeshFragment::SetNgonFaceFragmentTextureCoordinateCorners(
bool bGridOrder,
const ON_3dPoint face_texture_coordinate_corners[4],
ON_2dVector face_pack_rect_size,
ON_2udex ngon_grid_size,
ON_2dVector ngon_sub_pack_rect_size,
ON_2dVector ngon_sub_pack_rect_delta,
bool bSetTextureCoordinates
) const
{
for (;;)
{
if (
face_texture_coordinate_corners[0] == face_texture_coordinate_corners[1]
&& face_texture_coordinate_corners[0] == face_texture_coordinate_corners[2]
&& face_texture_coordinate_corners[0] == face_texture_coordinate_corners[3]
)
{
// constant texture coordinates
SetTextureCoordinateCornersForExperts(true, face_texture_coordinate_corners, bSetTextureCoordinates);
return;
}
const unsigned ngon_edge_count = m_face_fragment_count;
const unsigned ngon_fragment_index = m_face_fragment_index;
if (ngon_edge_count < 5 || ngon_edge_count > ON_SubDFace::MaximumEdgeCount)
break;
if (ngon_fragment_index >= ngon_edge_count)
break;
if (ngon_grid_size.i * ngon_grid_size.j < ngon_edge_count)
break;
const ON_2udex frag_k(ngon_fragment_index % ngon_grid_size.i, ngon_fragment_index / ngon_grid_size.i);
const double s0 = Internal_ClampBetweenZeroAndOne(frag_k.i * (ngon_sub_pack_rect_delta.x/face_pack_rect_size.x));
const double s1 = Internal_ClampBetweenZeroAndOne(s0 + (ngon_sub_pack_rect_size.x/ face_pack_rect_size.x));
const double t0 = Internal_ClampBetweenZeroAndOne(frag_k.j * (ngon_sub_pack_rect_delta.y/ face_pack_rect_size.y));
const double t1 = Internal_ClampBetweenZeroAndOne(t0 + (ngon_sub_pack_rect_size.y/ face_pack_rect_size.y));
const ON_3dPoint fragment_texture_coordinate_corners[4] = {
Internal_NgonFragmentTextureCoordinateCorner(bGridOrder,face_texture_coordinate_corners,s0,t0),
Internal_NgonFragmentTextureCoordinateCorner(bGridOrder,face_texture_coordinate_corners,s1,t0),
Internal_NgonFragmentTextureCoordinateCorner(bGridOrder,face_texture_coordinate_corners,s0,t1),
Internal_NgonFragmentTextureCoordinateCorner(bGridOrder,face_texture_coordinate_corners,s1,t1)
};
// fragment_texture_coordinate_corners[] is in grid order
SetTextureCoordinateCornersForExperts(true, fragment_texture_coordinate_corners, bSetTextureCoordinates);
return;
}
ON_SUBD_ERROR("Invalid input.");
const ON_3dPoint nan_corners[4] = { ON_3dPoint ::NanPoint,ON_3dPoint::NanPoint ,ON_3dPoint::NanPoint ,ON_3dPoint::NanPoint };
SetTextureCoordinateCornersForExperts(bGridOrder, nan_corners, bSetTextureCoordinates);
}
bool ON_SubDMeshFragment::GetNgonFaceFragmentPackRectCorners(
unsigned int ngon_edge_count,
unsigned int ngon_fragment_index,
bool bGridOrder,
const ON_2dPoint face_pack_rect_corners[4],
ON_2dVector face_pack_rect_size,
ON_2udex ngon_grid_size,
ON_2dVector ngon_sub_pack_rect_size,
ON_2dVector ngon_sub_pack_rect_delta,
ON_2dPoint fragment_pack_rect_corners[4]
)
{
for (;;)
{
if (ngon_edge_count < 5 || ngon_edge_count > ON_SubDFace::MaximumEdgeCount)
break;
if (ngon_fragment_index >= ngon_edge_count)
break;
if (ngon_grid_size.i * ngon_grid_size.j < ngon_edge_count)
break;
if (nullptr == fragment_pack_rect_corners)
break;
const ON_2udex frag_k(ngon_fragment_index % ngon_grid_size.i, ngon_fragment_index / ngon_grid_size.i);
const double s0 = Internal_ClampBetweenZeroAndOne(frag_k.i * (ngon_sub_pack_rect_delta.x / face_pack_rect_size.x));
const double s1 = Internal_ClampBetweenZeroAndOne(s0 + (ngon_sub_pack_rect_size.x / face_pack_rect_size.x));
const double t0 = Internal_ClampBetweenZeroAndOne(frag_k.j * (ngon_sub_pack_rect_delta.y / face_pack_rect_size.y));
const double t1 = Internal_ClampBetweenZeroAndOne(t0 + (ngon_sub_pack_rect_size.y / face_pack_rect_size.y));
const int i2 = bGridOrder ? 2 : 3;
const int i3 = bGridOrder ? 3 : 2;
fragment_pack_rect_corners[0] = Internal_NgonFragmentPackRectCorner(bGridOrder,face_pack_rect_corners,s0,t0);
fragment_pack_rect_corners[1] = Internal_NgonFragmentPackRectCorner(bGridOrder,face_pack_rect_corners,s1,t0);
fragment_pack_rect_corners[i2] = Internal_NgonFragmentPackRectCorner(bGridOrder,face_pack_rect_corners,s0,t1);
fragment_pack_rect_corners[i3] = Internal_NgonFragmentPackRectCorner(bGridOrder,face_pack_rect_corners,s1,t1);
return true;
}
ON_SUBD_ERROR("Invalid input.");
if (nullptr != fragment_pack_rect_corners)
{
fragment_pack_rect_corners[0] = ON_2dPoint::NanPoint;
fragment_pack_rect_corners[1] = ON_2dPoint::NanPoint;
fragment_pack_rect_corners[2] = ON_2dPoint::NanPoint;
fragment_pack_rect_corners[3] = ON_2dPoint::NanPoint;
}
return false;
}
void ON_SubDMeshFragment::SetNgonFaceFragmentPackRectCorners(
bool bGridOrder,
const ON_2dPoint face_pack_rect_corners[4],
ON_2dVector face_pack_rect_size,
ON_2udex ngon_grid_size,
ON_2dVector ngon_sub_pack_rect_size,
ON_2dVector ngon_sub_pack_rect_delta
)
{
ON_2dPoint fragment_pack_rect_corners[4];
ON_SubDMeshFragment::GetNgonFaceFragmentPackRectCorners(
m_face_fragment_count,
m_face_fragment_index,
bGridOrder,
face_pack_rect_corners,
face_pack_rect_size,
ngon_grid_size,
ngon_sub_pack_rect_size,
ngon_sub_pack_rect_delta,
fragment_pack_rect_corners
);
SetPackRectCornersForExperts(bGridOrder, fragment_pack_rect_corners);
}
void ON_SubDMeshFragment::SetTextureCoordinateCornersForExperts(
bool bGridOrder,
const ON_3dPoint fragment_texture_coordinate_corners[4],
bool bSetTextureCoordinates
) const
{
if (nullptr != fragment_texture_coordinate_corners)
{
// m_ctrlnetT[] is in grid order.
// lower left
m_ctrlnetT[0][0] = fragment_texture_coordinate_corners[0].x;
m_ctrlnetT[0][1] = fragment_texture_coordinate_corners[0].y;
m_ctrlnetT[0][2] = fragment_texture_coordinate_corners[0].z;
// lower right
m_ctrlnetT[1][0] = fragment_texture_coordinate_corners[1].x;
m_ctrlnetT[1][1] = fragment_texture_coordinate_corners[1].y;
m_ctrlnetT[1][2] = fragment_texture_coordinate_corners[1].z;
// upper left
int i = bGridOrder ? 2 : 3;
m_ctrlnetT[2][0] = fragment_texture_coordinate_corners[i].x;
m_ctrlnetT[2][1] = fragment_texture_coordinate_corners[i].y;
m_ctrlnetT[2][2] = fragment_texture_coordinate_corners[i].z;
// upper right
i = bGridOrder ? 3 : 2;
m_ctrlnetT[3][0] = fragment_texture_coordinate_corners[i].x;
m_ctrlnetT[3][1] = fragment_texture_coordinate_corners[i].y;
m_ctrlnetT[3][2] = fragment_texture_coordinate_corners[i].z;
if (bSetTextureCoordinates)
SetTextureCoordinatesFromCorners();
}
}
const ON_3dPoint ON_SubDMeshFragment::VertexTextureCoordinate(
ON_2udex grid2dex
) const
{
return VertexTextureCoordinate(m_grid.PointIndexFromGrid2dex(grid2dex.i, grid2dex.j));
}
const ON_3dPoint ON_SubDMeshFragment::VertexTextureCoordinate(
unsigned grid2dex_i,
unsigned grid2dex_j
) const
{
return VertexTextureCoordinate(m_grid.PointIndexFromGrid2dex(grid2dex_i, grid2dex_j));
}
const ON_3dPoint ON_SubDMeshFragment::VertexTextureCoordinate(
unsigned grid_point_index
) const
{
return
(grid_point_index >= TextureCoordinateCount())
? ON_3dPoint::NanPoint
: ON_3dPoint(m_T + grid_point_index * m_T_stride);
}
const ON_3dPoint ON_SubDMeshFragment::VertexTextureCoordinateFromCorners(unsigned grid2dex_i, unsigned grid2dex_j) const
{
const unsigned n = m_grid.SideSegmentCount();
if (n <= 0U || grid2dex_i > n || grid2dex_j > n)
return ON_3dPoint::NanPoint;
const double s = ((double)grid2dex_i) / ((double)n);
const double t = ((double)grid2dex_j) / ((double)n);
const double c[4] = { (1.0 - s)*(1.0 - t), s*(1.0 - t), (1.0 - s)*t, s*t };
return ON_3dPoint(
c[0] * m_ctrlnetT[0][0] + c[1] * m_ctrlnetT[1][0] + c[2] * m_ctrlnetT[2][0] + c[3] * m_ctrlnetT[3][0],
c[0] * m_ctrlnetT[0][1] + c[1] * m_ctrlnetT[1][1] + c[2] * m_ctrlnetT[2][1] + c[3] * m_ctrlnetT[3][1],
c[0] * m_ctrlnetT[0][2] + c[1] * m_ctrlnetT[1][2] + c[2] * m_ctrlnetT[2][2] + c[3] * m_ctrlnetT[3][2]
);
}
const ON_3dPoint ON_SubDMeshFragment::VertexTextureCoordinateFromCorners(ON_2udex grid2dex) const
{
return VertexTextureCoordinateFromCorners(grid2dex.i, grid2dex.j);
}
const ON_3dPoint ON_SubDMeshFragment::VertexTextureCoordinateFromCorners(unsigned grid_point_index) const
{
return VertexTextureCoordinateFromCorners(m_grid.Grid2dexFromPointIndex(grid_point_index));
}
void ON_SubDMeshFragment::SetTextureCoordinatesFromCorners() const
{
Internal_SetTextureCoordinatesFromCorners(m_ctrlnetT[0], m_ctrlnetT[1], m_ctrlnetT[2], m_ctrlnetT[3], ON_DBL_QNAN, 3);
}
void ON_SubDMeshFragment::SetPackedTextureCoordinates() const
{
Internal_SetTextureCoordinatesFromCorners(m_pack_rect[0], m_pack_rect[1], m_pack_rect[2], m_pack_rect[3], 0.0, 2);
}
void ON_SubDMeshFragment::SetUnpackedTextureCoordinates() const
{
const double unpacked_corners[4][2] =
{
{0.0,0.0},
{1.0,0.0},
{0.0,1.0},
{1.0,1.0},
};
Internal_SetTextureCoordinatesFromCorners(unpacked_corners[0], unpacked_corners[1], unpacked_corners[2], unpacked_corners[3], 0.0, 2);
}
void ON_SubDMeshFragment::Internal_SetTextureCoordinatesFromCorners(
const double* corner0,
const double* corner1,
const double* corner2,
const double* corner3,
double default_coordinate_value,
int corner_dim
) const
{
const unsigned n = m_grid.SideSegmentCount();
if (n <= 0U || n > ON_SubDMeshFragment::MaximumSideSegmentCount)
return;
// TextureCoordinateCapacity() check insures m_T_stride >= 3
if (TextureCoordinateCapacity() < n * n)
return;
if (corner_dim <= 0)
return;
SetTextureCoordinatesExist(true);
double* T = m_T;
const double d = (double)n;
double s, t;
ON_3dPoint tc(default_coordinate_value, default_coordinate_value, default_coordinate_value);
bool bConstant[3] = { corner_dim < 1, corner_dim < 2, corner_dim < 3 };
for (int i = 0; i < corner_dim; ++i)
{
double c = corner0[i];
if (c == corner1[i] && c == corner2[i] && c == corner3[i])
{
tc[i] = c;
bConstant[i] = true;
}
else if (false == (c == c) || false == (corner1[i] == corner1[i]) || false == (corner2[i] == corner2[i]) || false == (corner3[i] == corner3[i]))
{
tc[i] = ON_DBL_QNAN;
bConstant[i] = true;
}
}
for (unsigned j = 0U; j <= n; ++j)
{
t = ((double)j) / d;
for (unsigned i = 0U; i <= n; ++i)
{
s = ((double)i) / d;
const double c[4] = { (1.0 - s) * (1.0 - t), s * (1.0 - t), (1.0 - s) * t, s * t };
if (false == bConstant[0])
tc.x = c[0] * corner0[0] + c[1] * corner1[0] + c[2] * corner2[0] + c[3] * corner3[0];
if (false == bConstant[1])
tc.y = c[0] * corner0[1] + c[1] * corner1[1] + c[2] * corner2[1] + c[3] * corner3[1];
if (false == bConstant[2])
tc.z = c[0] * corner0[2] + c[1] * corner1[2] + c[2] * corner2[2] + c[3] * corner3[2];
T[0] = tc.x;
T[1] = tc.y;
T[2] = tc.z;
T += m_T_stride;
}
}
return;
}
bool ON_SubDMeshFragment::SetVertexTextureCoordinate(
ON_2udex grid2dex,
ON_3dPoint texture_coordinate
) const
{
return SetVertexTextureCoordinate(m_grid.PointIndexFromGrid2dex(grid2dex.i, grid2dex.j), texture_coordinate);
}
bool ON_SubDMeshFragment::SetVertexTextureCoordinate(
unsigned grid2dex_i,
unsigned grid2dex_j,
ON_3dPoint texture_coordinate
) const
{
return SetVertexTextureCoordinate(m_grid.PointIndexFromGrid2dex(grid2dex_i, grid2dex_j), texture_coordinate);
}
bool ON_SubDMeshFragment::SetVertexTextureCoordinate(
unsigned grid_point_index,
ON_3dPoint texture_coordinate
) const
{
if (grid_point_index >= TextureCoordinateCapacity())
return false;
double* T = (m_T + grid_point_index * m_T_stride);
T[0] = texture_coordinate.x;
T[1] = texture_coordinate.y;
T[2] = texture_coordinate.z;
SetTextureCoordinatesExist(true);
return true;
}
#pragma endregion
#endif
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