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opennurbs/opennurbs_subd_eval.cpp
Will Pearson f2dc7fba67 Update source to v6.14.19098.19271
2019-04-09 10:44:41 -07:00

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#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"
#if defined(OPENNURBS_SUBD_WIP)
ON_SubD* ON_SubDSectorType::SectorRingSubD(
double radius,
double sector_angle_radians,
ON_SubD* subd
) const
{
if (subd)
*subd = ON_SubD::Empty;
if (!IsValid())
return ON_SUBD_RETURN_ERROR(nullptr);
const unsigned int R = PointRingCount();
if (R < 3)
return ON_SUBD_RETURN_ERROR(nullptr);
const unsigned int F = FaceCount();
if ( F < 1)
return ON_SUBD_RETURN_ERROR(nullptr);
const unsigned int N = EdgeCount();
if (N < 2)
return ON_SUBD_RETURN_ERROR(nullptr);
if (F != N && F + 1 != N)
return ON_SUBD_RETURN_ERROR(nullptr);
const ON_SubD::SubDType subdivision_type = SubDType();
const ON_SubD::VertexTag vertex_tag = VertexTag();
const unsigned f_edge_count = ON_SubD::FacetEdgeCount(subdivision_type);
if (3 != f_edge_count && 4 != f_edge_count)
return ON_SUBD_RETURN_ERROR(nullptr);
const unsigned int ring_ei_delta = f_edge_count - 2;
if (nullptr == subd)
subd = new ON_SubD;
ON_SubD::VertexTag vertex_tag0;
ON_SubD::VertexTag vertex_tag1;
ON_SubD::EdgeTag edge_tag0;
ON_SubD::EdgeTag edge_tag1;
switch (vertex_tag)
{
case ON_SubD::VertexTag::Smooth:
sector_angle_radians = 2.0*ON_PI;
vertex_tag0 = ON_SubD::VertexTag::Smooth;
vertex_tag1 = ON_SubD::VertexTag::Smooth;
edge_tag0 = ON_SubD::EdgeTag::Smooth;
edge_tag1 = ON_SubD::EdgeTag::Smooth;
break;
case ON_SubD::VertexTag::Crease:
if ( !(sector_angle_radians > 0.0 && sector_angle_radians < 2.0*ON_PI) )
sector_angle_radians = 0.5*ON_PI;
vertex_tag0 = ON_SubD::VertexTag::Crease;
vertex_tag1 = ON_SubD::VertexTag::Crease;
edge_tag0 = ON_SubD::EdgeTag::Crease;
edge_tag1 = ON_SubD::EdgeTag::Crease;
break;
case ON_SubD::VertexTag::Corner:
sector_angle_radians = CornerSectorAngleRadians();
vertex_tag0 = ON_SubD::VertexTag::Crease;
vertex_tag1 = ON_SubD::VertexTag::Crease;
edge_tag0 = ON_SubD::EdgeTag::Crease;
edge_tag1 = ON_SubD::EdgeTag::Crease;
break;
case ON_SubD::VertexTag::Dart:
sector_angle_radians = 2.0*ON_PI;
vertex_tag0 = ON_SubD::VertexTag::Crease;
vertex_tag1 = ON_SubD::VertexTag::Smooth;
edge_tag0 = ON_SubD::EdgeTag::Crease;
edge_tag1 = ON_SubD::EdgeTag::Smooth;
break;
default:
return ON_SUBD_RETURN_ERROR(nullptr);
break;
}
unsigned int sector_angle_index = ON_SubDSectorType::AngleIndexFromAngleRadians(sector_angle_radians);
if (sector_angle_index <= ON_SubDSectorType::MaximumAngleIndex
&& fabs(ON_SubDSectorType::AngleRadiansFromAngleIndex(sector_angle_index) - sector_angle_radians) <= 1.0e-6
)
{
sector_angle_radians = ON_SubDSectorType::AngleRadiansFromAngleIndex(sector_angle_index);
}
else
{
sector_angle_radians = ON_UNSET_UINT_INDEX;
}
const double smooth_edge_w0 = this->SectorWeight();
ON_SimpleArray< ON_SubDVertex* > V(R);
ON_SimpleArray< ON_SubDEdge* > E(N);
ON_3dPoint vertexP = ON_3dPoint::Origin;
for (unsigned int vi = 0; vi < R; vi++)
{
ON_SubD::VertexTag vertex_tag_vi;
if ( 0 == vi )
vertex_tag_vi = vertex_tag; // center vertex
else if ( 1 == vi )
vertex_tag_vi = vertex_tag0; // first edge
else if ( R == vi+1 && N > F )
vertex_tag_vi = vertex_tag1; // last edge
else
vertex_tag_vi = ON_SubD::VertexTag::Smooth; // interior edge or an outer face vertex
if (radius > 0.0)
{
double cos_a, sin_a;
if (sector_angle_index == ON_UNSET_UINT_INDEX)
{
double a = (vi / ((double)(R-1)))*sector_angle_radians;
cos_a = cos(a);
sin_a = sin(a);
}
else
{
ON_SubDMatrix::EvaluateCosAndSin(2*sector_angle_index*vi, (R-1)*ON_SubDSectorType::MaximumAngleIndex,&cos_a,&sin_a);
}
const double r = (3 == f_edge_count) || (1 == (vi%2)) ? radius : (2.0*radius);
vertexP.x = r*cos_a;
vertexP.y = r*sin_a;
}
ON_SubDVertex* vertex = subd->AddVertex( vertex_tag_vi, vertexP);
V.Append(vertex);
}
//V[0]->m_vertex_edge_order = ON_SubD::VertexEdgeOrder::radial;
for (unsigned int vei = 0; vei < N; vei++)
{
ON_SubD::EdgeTag edge_tag_vei;
if ( 0 == vei )
edge_tag_vei = edge_tag0; // first edge
else if ( vei+1 == N )
edge_tag_vei = edge_tag1; // last edge
else
edge_tag_vei = ON_SubD::EdgeTag::Smooth; // interior edge
double w0 = (ON_SubD::EdgeTag::Smooth == edge_tag_vei) ? smooth_edge_w0 : ON_SubDSectorType::IgnoredSectorWeight;
unsigned int ev1i = 1 + vei*ring_ei_delta;
E.Append(
subd->AddEdgeWithSectorCoefficients(
edge_tag_vei,
V[0], w0,
V[ev1i], ON_SubDSectorType::IgnoredSectorWeight)
);
}
ON_SubDVertex* f_vertex[4] = {};
ON_SubDEdge* f_edge[4] = {};
ON_SubDEdgePtr f_edgeptr[4] = {};
f_vertex[0] = V[0];
f_vertex[f_edge_count - 1] = const_cast<ON_SubDVertex*>(E[0]->m_vertex[1]);
f_edge[f_edge_count - 1] = E[0];
for (unsigned int vfi = 0; vfi < F; vfi++)
{
f_edge[0] = f_edge[f_edge_count - 1];
f_edge[f_edge_count-1] = E[(vfi + 1) % N];
f_vertex[1] = const_cast<ON_SubDVertex*>(f_edge[0]->m_vertex[1]);
f_vertex[f_edge_count - 1] = const_cast<ON_SubDVertex*>(f_edge[f_edge_count - 1]->m_vertex[1]);
f_edgeptr[0] = ON_SubDEdgePtr::Create(f_edge[0], 0);
f_edgeptr[f_edge_count - 1] = ON_SubDEdgePtr::Create(f_edge[f_edge_count - 1], 1);
if (4 == f_edge_count)
{
f_vertex[2] = V[2 + 2 * vfi];
f_edge[1] = subd->AddEdgeWithSectorCoefficients(ON_SubD::EdgeTag::Smooth, f_vertex[1], ON_SubDSectorType::IgnoredSectorWeight, f_vertex[2], ON_SubDSectorType::IgnoredSectorWeight);
f_edge[2] = subd->AddEdgeWithSectorCoefficients(ON_SubD::EdgeTag::Smooth, f_vertex[2], ON_SubDSectorType::IgnoredSectorWeight, f_vertex[3], ON_SubDSectorType::IgnoredSectorWeight);
f_edgeptr[1] = ON_SubDEdgePtr::Create(f_edge[1], 0);
f_edgeptr[2] = ON_SubDEdgePtr::Create(f_edge[2], 0);
}
else
{
f_edge[1] = subd->AddEdgeWithSectorCoefficients(ON_SubD::EdgeTag::Smooth, f_vertex[1], ON_SubDSectorType::IgnoredSectorWeight, f_vertex[2], ON_SubDSectorType::IgnoredSectorWeight);
f_edgeptr[1] = ON_SubDEdgePtr::Create(f_edge[1], 0);
}
subd->AddFace(f_edge_count, f_edgeptr);
}
return subd;
}
static bool TestPoint(
const ON_3dPoint* SP,
unsigned int SPi,
ON_3dPoint Q,
unsigned int Pi,
double* e,
unsigned int* ei
)
{
ON_3dPoint P = SP[SPi];
double z = fabs(P[(Pi + 1) % 3]) + fabs(P[(Pi + 1) % 3])+ fabs(Q[(Pi + 1) % 3]) + fabs(Q[(Pi + 1) % 3]);
if (!(0.0 == z))
{
// ON_ERROR("point coordinate is not zero.");
return ON_SUBD_RETURN_ERROR(false);
}
if (fabs(P[Pi]) > 1.0)
{
// ON_ERROR("point coordinate P[Pi] > 1.");
return ON_SUBD_RETURN_ERROR(false);
}
if (fabs(Q[Pi]) > 1.0)
{
// ON_ERROR("point coordinate Q[Pi] > 1.");
return ON_SUBD_RETURN_ERROR(false);
}
double d = fabs(P[Pi] - Q[Pi]);
if (d > e[Pi])
{
e[Pi] = d;
*ei = SPi;
#if defined(ON_DEBUG)
if (d > 0.0001)
{
// almost certainly a bug
ON_SubDIncrementErrorCount();
}
#endif
}
return true;
}
//double ON_QNaN()
//{
// const char* sIgnored = "";
// return nan(sIgnored);
//}
//
//bool ON_IsNaN(double x)
//{
// return (0 != isnan(x));
//}
//
//void ON_SetToQNaN(double* x)
//{
// if (nullptr != x)
// *x = ON_QNaN();
//}
//
//bool ON_IsNaN(ON_3dPoint& point)
//{
// return (ON_IsNaN(point.x) || ON_IsNaN(point.y) || ON_IsNaN(point.z));
//}
//
//void ON_SetToQNaN(ON_3dPoint* point)
//{
// if (nullptr != point)
// {
// point->x = ON_QNaN();
// point->y = ON_QNaN();
// point->z = ON_QNaN();
// }
//}
static bool ClearCachedPoints(
unsigned int component_ring_count,
const ON_SubDComponentPtr* component_ring
)
{
if ( component_ring_count < 4 || nullptr == component_ring)
return ON_SUBD_RETURN_ERROR(false);
ON_SubDVertex* vertex = component_ring[0].Vertex();
if ( nullptr == vertex)
return ON_SUBD_RETURN_ERROR(false);
vertex->ClearSavedSubdivisionPoint();
vertex->ClearSavedLimitPoints();
for (unsigned int i = 1; i < component_ring_count; i++)
{
ON_SubDEdge* edge = component_ring[i].Edge();
if ( nullptr == edge)
return ON_SUBD_RETURN_ERROR(false);
edge->ClearSavedSubdivisionPoint();
i++;
if (i >= component_ring_count)
break;
ON_SubDFace* face = component_ring[i].Face();
if ( nullptr == face)
return ON_SUBD_RETURN_ERROR(false);
face->ClearSavedSubdivisionPoint();
}
return true;
}
double ON_SubDMatrix::TestEvaluation() const
{
if ( nullptr == m_S || m_R < 3 )
return ON_SUBD_RETURN_ERROR(ON_UNSET_VALUE);
if (!m_sector_type.IsValid())
return ON_SUBD_RETURN_ERROR(ON_UNSET_VALUE);
const ON_SubD::SubDType subd_type = m_sector_type.SubDType();
//ON_SubD::VertexTag center_vertex_tag = m_sector_type.VertexTag();
const unsigned int F = m_sector_type.FaceCount();
if (0 == F)
return ON_SUBD_RETURN_ERROR(ON_UNSET_VALUE);
const unsigned int N = m_sector_type.EdgeCount();
if (0 == N)
return ON_SUBD_RETURN_ERROR(ON_UNSET_VALUE);
const unsigned int R = m_sector_type.PointRingCount();
if (0 == R)
return ON_SUBD_RETURN_ERROR(ON_UNSET_VALUE);
if (R != m_R)
return ON_SUBD_RETURN_ERROR(ON_UNSET_VALUE);
const unsigned f_edge_count = m_sector_type.FacetEdgeCount();
if (0 == f_edge_count)
return ON_SUBD_RETURN_ERROR(ON_UNSET_VALUE);
double rc = TestMatrix();
const double*const* S = m_S;
unsigned int SP_low_precision_index = ON_UNSET_UINT_INDEX;
ON_SimpleArray< ON_3dPoint > _P(R);
ON_3dPoint* SP = _P.Array();
ON_SimpleArray< double > _Scol(R);
double* Scol = _Scol.Array();
ON_SubD subd;
if (&subd != m_sector_type.SectorRingSubD(0.0,0.0,&subd))
return ON_SUBD_RETURN_ERROR(ON_UNSET_VALUE);
const ON_SubDVertex* vertex0 = subd.FirstVertex();
if (nullptr == vertex0)
return ON_SUBD_RETURN_ERROR(ON_UNSET_VALUE);
if (N != vertex0->m_edge_count)
return ON_SUBD_RETURN_ERROR(ON_UNSET_VALUE);
if (F != vertex0->m_face_count)
return ON_SUBD_RETURN_ERROR(ON_UNSET_VALUE);
ON_SubDSectorIterator sit;
if ( nullptr == sit.Initialize(vertex0) )
return ON_SUBD_RETURN_ERROR(ON_UNSET_VALUE);
ON_SimpleArray<const ON_SubDVertex*> vertex_ring_array(subd.VertexCount());
for (const ON_SubDVertex* vertex = vertex0; nullptr != vertex; vertex = vertex->m_next_vertex)
{
vertex_ring_array.Append(vertex);
}
if ( R != vertex_ring_array.UnsignedCount())
return ON_SUBD_RETURN_ERROR(ON_UNSET_VALUE);
const ON_SubDVertex*const* vertex_ring = vertex_ring_array.Array();
ON_SimpleArray<ON_SubDComponentPtr> component_ring_array;
const unsigned int component_ring_count = ON_SubD::GetSectorComponentRing(sit,component_ring_array);
if ( component_ring_count < 4 || component_ring_count != m_sector_type.ComponentRingCount())
return ON_SUBD_RETURN_ERROR(ON_UNSET_VALUE);
const ON_SubDComponentPtr* component_ring = component_ring_array.Array();
ON_SimpleArray< ON_3dPoint > _ringP0;
ON_SimpleArray< ON_3dPoint > _ringP1;
for (unsigned int vi = 0; vi < R; vi++)
Scol[vi] = ON_DBL_QNAN;
for (unsigned int vi = 0; vi < R; vi++)
{
double N_vertex_point_precision[3] = { 0 };
double N_outer_point_precision[3] = { 0 };
double N_Scol_precision[3] = { 0 };
for (unsigned int Pi = 0; Pi < 3; Pi++)
{
if (false == ClearCachedPoints(component_ring_count,component_ring))
return ON_SUBD_RETURN_ERROR(ON_UNSET_VALUE);
const_cast<ON_SubDVertex*>(vertex_ring[vi])->m_P[Pi] = 1.0;
if ( R != ON_SubD::GetSectorPointRing(subd_type,false,component_ring_count,component_ring,_ringP0))
return ON_SUBD_RETURN_ERROR(ON_UNSET_VALUE);
const ON_3dPoint* ringP0 = _ringP0.Array();
// vertex_ring[]->m_P and ringP0[] should be same point lists
for (unsigned int i = 0; i < R; i++)
{
if (0.0 == ringP0[i][(Pi+1)%3] && 0.0 == ringP0[i][(Pi+2)%3])
{
if ( ringP0[i][Pi] == ((i == vi) ? 1.0 : 0.0) )
continue;
}
// vertex_ring[] is not in the expected order or
// there is a bug in ON_SubD::GetSectorPointRing
return ON_SUBD_RETURN_ERROR(ON_UNSET_VALUE);
}
if ( R != ON_SubD::GetSectorSubdivisionPointRing(subd_type,component_ring_count,component_ring,_ringP1))
return ON_SUBD_RETURN_ERROR(ON_UNSET_VALUE);
const ON_3dPoint* ringP1 = _ringP1.Array();
for (unsigned int i = 0; i < R; i++)
{
SP[i] = ON_3dPoint::Origin;
for (unsigned int j = 0; j < R; j++)
{
SP[i] += S[i][j] * ringP0[j];
}
}
if (!(SP[vi][Pi] > 0.0))
{
// ON_ERROR("SP[vi][Pi] is not positive.");
return ON_SUBD_RETURN_ERROR(ON_UNSET_VALUE);
}
if (false == TestPoint(SP, 0, ringP1[0], Pi, N_vertex_point_precision, &SP_low_precision_index))
return ON_SUBD_RETURN_ERROR(ON_UNSET_VALUE);
for (unsigned int j = 1; j < R; j++)
{
if (false == TestPoint(SP, j, ringP1[j], Pi, N_outer_point_precision, &SP_low_precision_index))
return ON_SUBD_RETURN_ERROR(ON_UNSET_VALUE);
}
for (unsigned int i = 0; i < R; i++)
{
double d = fabs(S[i][vi] - ringP1[i][Pi]);
if (d > N_Scol_precision[Pi])
N_Scol_precision[Pi] = d;
}
if (!(N_vertex_point_precision[0] == N_vertex_point_precision[Pi]))
{
ON_ERROR("x,y,z vertex point precisions are not identical.");
return ON_SUBD_RETURN_ERROR(ON_UNSET_VALUE);
}
if (!(N_outer_point_precision[0] == N_outer_point_precision[Pi]))
{
ON_ERROR("x,y,z outer point precisions are not identical.");
return ON_SUBD_RETURN_ERROR(ON_UNSET_VALUE);
}
if (!(N_Scol_precision[0] == N_Scol_precision[Pi]))
{
ON_ERROR("x,y,z S column precisions are not identical.");
return ON_SUBD_RETURN_ERROR(ON_UNSET_VALUE);
}
if (rc < N_vertex_point_precision[0])
rc = N_vertex_point_precision[0];
if (rc < N_outer_point_precision[0])
rc = N_outer_point_precision[0];
if (rc < N_Scol_precision[0])
rc = N_Scol_precision[0];
const_cast<ON_SubDVertex*>(vertex_ring[vi])->m_P[Pi] = 0.0;
}
}
return rc; // basic tests passed.
}
static bool GetSectorLimitPointHelper(
ON_SubD::SubDType subdivision_type,
const ON_SubDSectorIterator& sit,
ON_SubDSectorLimitPoint& limit_point
)
{
const ON_SubDSectorType sector_type = ON_SubDSectorType::Create(subdivision_type,sit);
if (false == sector_type.IsValid())
return ON_SUBD_RETURN_ERROR(false);
const unsigned int R = sector_type.PointRingCount();
if (R < 3)
return ON_SUBD_RETURN_ERROR(false);
double stack_point_ring[41*3];
double* point_ring = stack_point_ring;
const unsigned int point_ring_stride = 3;
unsigned int point_ring_capacity = (unsigned int)(sizeof(stack_point_ring)/(point_ring_stride*sizeof(stack_point_ring[0])));
if (point_ring_capacity < R )
{
point_ring = new(std::nothrow) double[point_ring_stride*R];
if ( nullptr == point_ring)
return ON_SUBD_RETURN_ERROR(false);
point_ring_capacity = R;
}
if ( R != ON_SubD::GetSectorPointRing(subdivision_type,true,sit,point_ring_capacity,point_ring_stride,point_ring) )
return ON_SUBD_RETURN_ERROR(false);
bool rc = false;
for (;;)
{
const ON_SubDMatrix& SM = ON_SubDMatrix::FromCache(sector_type);
if (R != SM.m_R || nullptr == SM.m_LP)
break;
if (false == SM.EvaluateLimitPoint(R, point_ring_stride, point_ring, limit_point))
break;
rc = true;
break;
}
if ( point_ring != stack_point_ring)
delete[] point_ring;
return rc
? true
: ON_SUBD_RETURN_ERROR(false);
}
static ON_SubDSectorLimitPoint* LimitPointPool(
const ON_SubDSectorLimitPoint* pReturnToPool // If nullptr, then one is allocated
)
{
static ON_FixedSizePool limit_point_fsp;
if (0 == limit_point_fsp.SizeofElement())
{
if (nullptr != pReturnToPool)
return ON_SUBD_RETURN_ERROR(nullptr);
limit_point_fsp.Create(sizeof(ON_SubDSectorLimitPoint), 0, 0);
}
if (nullptr != pReturnToPool)
{
limit_point_fsp.ReturnElement((void*)pReturnToPool);
return nullptr;
}
ON_SubDSectorLimitPoint* lp = (ON_SubDSectorLimitPoint*)limit_point_fsp.AllocateDirtyElement();
if (nullptr == lp)
return ON_SUBD_RETURN_ERROR(nullptr);
return lp;
}
bool ON_SubDVertex::GetLimitPoint(
ON_SubD::SubDType subd_type,
const ON_SubDFace* sector_face,
bool bUseSavedLimitPoint,
ON_SubDSectorLimitPoint& limit_point
) const
{
bool rc = false;
ON_SubDSectorIterator sit;
const ON_SubDFace* limit_point_sector_face = nullptr;
if (nullptr != sector_face)
{
for (unsigned int vfi = 0; vfi < m_face_count; vfi++)
{
if (sector_face == m_faces[vfi])
{
rc = true;
break;
}
}
if (false == rc)
{
// sector_face is not referenced by this vertex
limit_point = ON_SubDSectorLimitPoint::Unset;
return ON_SUBD_RETURN_ERROR(false);
}
}
if (bUseSavedLimitPoint && subd_type == SavedLimitPointType() )
{
if (nullptr == m_limit_point.m_sector_face)
{
// single sector
limit_point = m_limit_point;
limit_point.m_next_sector_limit_point = nullptr;
return true;
}
if (nullptr == sector_face)
{
// this vertex has multiple sectors
limit_point = ON_SubDSectorLimitPoint::Unset;
return ON_SUBD_RETURN_ERROR(false);
}
if (nullptr == sit.Initialize(sector_face, 0, this))
{
limit_point = ON_SubDSectorLimitPoint::Unset;
return ON_SUBD_RETURN_ERROR(false);
}
limit_point_sector_face = sit.IncrementToCrease(-1);
if (nullptr == limit_point_sector_face)
{
// no creases
limit_point = ON_SubDSectorLimitPoint::Unset;
return ON_SUBD_RETURN_ERROR(false);
}
for (const ON_SubDSectorLimitPoint* lp = &m_limit_point; nullptr != lp; lp = lp->m_next_sector_limit_point)
{
if (limit_point_sector_face == lp->m_sector_face)
{
limit_point = *lp;
limit_point.m_next_sector_limit_point = nullptr;
return true;
}
}
// cache does not contain this limit point.
}
if (nullptr == (nullptr == sector_face ? sit.Initialize(this) : sit.Initialize(sector_face, 0, this)))
{
limit_point = ON_SubDSectorLimitPoint::Unset;
return ON_SUBD_RETURN_ERROR(false);
}
if (nullptr == sit.Initialize(sector_face,0,this))
{
limit_point = ON_SubDSectorLimitPoint::Unset;
return ON_SUBD_RETURN_ERROR(false);
}
limit_point_sector_face = sit.IncrementToCrease(-1);
rc = GetSectorLimitPointHelper(subd_type, sit, limit_point);
if (false == rc)
{
limit_point = ON_SubDSectorLimitPoint::Unset;
return ON_SUBD_RETURN_ERROR(false);
}
limit_point.m_sector_face = limit_point_sector_face;
if (bUseSavedLimitPoint)
{
ON_SubDSectorLimitPoint saved_limit_point = limit_point;
saved_limit_point.m_next_sector_limit_point = (ON_SubDSectorLimitPoint*)1; // causes unnecessary test to be skipped
SetSavedLimitPoint(subd_type, saved_limit_point);
}
return rc;
}
ON_SubD::SubDType ON_SubDVertex::GetSavedLimitPointLocation(
double limit_point[3]
) const
{
const ON_SubD::SubDType subd_type = SavedLimitPointType();
if (ON_SubD::SubDType::Unset != subd_type)
{
limit_point[0] = m_limit_point.m_limitP[0];
limit_point[1] = m_limit_point.m_limitP[1];
limit_point[2] = m_limit_point.m_limitP[2];
}
return subd_type;
}
static bool SetLimitPointSectorCheck(
const ON_SubDVertex* vertex,
ON_SubDSectorLimitPoint& limit_point
)
{
const unsigned int vertex_face_count = vertex->m_face_count;
if ( vertex_face_count < 1 || nullptr == vertex->m_faces)
return ON_SUBD_RETURN_ERROR(false);
ON_SubDSectorIterator sit;
const ON_SubDFace* limit_point_sector_face = limit_point.m_sector_face;
if (nullptr != limit_point_sector_face)
{
bool rc = false;
for (unsigned int vfi = 0; vfi < vertex_face_count; vfi++)
{
if (limit_point_sector_face == vertex->m_faces[vfi])
{
rc = true;
break;
}
}
if (false == rc)
return ON_SUBD_RETURN_ERROR(false); // sector_face is not referenced by this vertex
if (nullptr == sit.Initialize(limit_point_sector_face, 0, vertex))
return ON_SUBD_RETURN_ERROR(false);
}
else if (nullptr == sit.Initialize(vertex))
return ON_SUBD_RETURN_ERROR(false);
limit_point_sector_face = sit.IncrementToCrease(-1);
unsigned int sector_face_count = 0;
const ON_SubDFace* sector_face0 = sit.CurrentFace();
for (const ON_SubDFace* sector_face = sector_face0; nullptr != sector_face && sector_face_count <= vertex_face_count; sector_face = sit.NextFace(ON_SubDSectorIterator::StopAt::AnyCrease))
{
if (sector_face == sector_face0 && sector_face_count == vertex_face_count && vertex->IsSmoothOrDart())
{
// interior vertex
limit_point_sector_face = nullptr;
break;
}
sector_face_count++;
}
if (sector_face_count > vertex_face_count)
{
// error in topology information
return ON_SUBD_RETURN_ERROR(false);
}
if (sector_face_count == vertex_face_count)
{
// vertex has 1 sector (bounded or interior)
limit_point_sector_face = nullptr;
}
else if (nullptr == limit_point_sector_face )
{
// vertex has multiple sectors and
// limit_point.m_sector_face must be the "first" face in the sector
return ON_SUBD_RETURN_ERROR(false);
}
limit_point.m_sector_face = limit_point_sector_face;
return true;
}
bool ON_SubDVertex::SetSavedLimitPoint(
ON_SubD::SubDType subd_type,
ON_SubDSectorLimitPoint limit_point
) const
{
const bool bSkipSectorCheck = (1U == (ON__UINT_PTR)limit_point.m_next_sector_limit_point);
limit_point.m_next_sector_limit_point = nullptr;
if ( ON_SubD::SubDType::Unset != subd_type
&& limit_point.IsSet()
&& (bSkipSectorCheck || SetLimitPointSectorCheck(this,limit_point))
)
{
if (nullptr == limit_point.m_sector_face
|| ON_UNSET_VALUE == m_limit_point.m_limitP[0]
|| 0 == ON_SUBD_CACHE_LIMIT_FLAG(m_saved_points_flags)
)
{
// vertex has 1 sector or this is the first cached limit point
ClearSavedLimitPoints();
m_limit_point = limit_point;
m_limit_point.m_next_sector_limit_point = nullptr;
}
else
{
// get a point from the pool
ON_SubDSectorLimitPoint* lp = LimitPointPool(nullptr);
if ( nullptr == lp)
return ON_SUBD_RETURN_ERROR(false);
// set the point
*lp = limit_point;
// first limit point location wins
ON_SubDLimitMeshFragment::SealPoints(true, m_limit_point.m_limitP, lp->m_limitP);
// it is expected that the limit normal and tangents will be substantually different.
lp->m_next_sector_limit_point = nullptr;
// append the point to the vertex's linked list.
const ON_SubDSectorLimitPoint* p = &m_limit_point;
while(nullptr != p->m_next_sector_limit_point)
{
p = p->m_next_sector_limit_point;
}
const_cast<ON_SubDSectorLimitPoint*>(p)->m_next_sector_limit_point = lp;
}
if ( subd_type != ON_SubD::SubDTypeFromUnsigned(m_saved_points_flags & ON_SUBD_CACHE_TYPE_MASK) )
m_saved_points_flags = 0U;
m_saved_points_flags |= (ON_SUBD_CACHE_LIMIT_FLAG_MASK | ((unsigned char)subd_type));
return true;
}
ClearSavedLimitPoints();
if (ON_SubD::SubDType::Unset != subd_type)
return ON_SUBD_RETURN_ERROR(false);
return true;
}
void ON_SubDVertex::ClearSavedLimitPoints() const
{
ON_SUBD_CACHE_CLEAR_LIMIT_FLAG(m_saved_points_flags);
if (ON_UNSET_VALUE != m_limit_point.m_limitP[0] && nullptr != m_limit_point.m_sector_face)
{
// return multiple sector limit points to pool
const ON_SubDSectorLimitPoint* next_p = m_limit_point.m_next_sector_limit_point;
for (const ON_SubDSectorLimitPoint* p = next_p; nullptr != p; p = next_p)
{
next_p = p->m_next_sector_limit_point;
LimitPointPool(p);
}
}
m_limit_point = ON_SubDSectorLimitPoint::Unset;
}
ON_SubD::SubDType ON_SubDVertex::SavedLimitPointType() const
{
return
(0 != (ON_SUBD_CACHE_LIMIT_FLAG_MASK & m_saved_points_flags))
? ((ON_SubD::SubDType)ON_SUBD_CACHE_TYPE(m_saved_points_flags))
: ON_SubD::SubDType::Unset;
}
#endif
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