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&#160;<span id="projectnumber">6.0</span>
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<a href="#pub-types">Public Types</a> &#124;
<a href="#pub-methods">Public Member Functions</a> &#124;
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<a href="class_o_n___clipping_region-members.html">List of all members</a> </div>
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<div class="title">ON_ClippingRegion Class Reference</div> </div>
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<p><code>#include &lt;<a class="el" href="opennurbs__xform_8h_source.html">opennurbs_xform.h</a>&gt;</code></p>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-types"></a>
Public Types</h2></td></tr>
<tr class="memitem:a630cfb58f6cb4c81050a174f2caf3822"><td class="memItemLeft" align="right" valign="top">enum &#160;</td><td class="memItemRight" valign="bottom">{ <br />
&#160;&#160;<a class="el" href="class_o_n___clipping_region.html#a630cfb58f6cb4c81050a174f2caf3822a0705e8187649b87a60fde84e06781d5a">max_clip_plane_count</a> = 16,
<a class="el" href="class_o_n___clipping_region.html#a630cfb58f6cb4c81050a174f2caf3822a6b9cd52921539546fec38665ae2de156">frustum_bitmask</a> = 0x0000003F,
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-methods"></a>
Public Member Functions</h2></td></tr>
<tr class="memitem:ac1e2510084a6196240903aca69917dec"><td class="memItemLeft" align="right" valign="top">&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_o_n___clipping_region.html#ac1e2510084a6196240903aca69917dec">ON_ClippingRegion</a> ()</td></tr>
<tr class="separator:ac1e2510084a6196240903aca69917dec"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a89728f57e90f0d01cc57f6b8c7b9362b"><td class="memItemLeft" align="right" valign="top">double&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_o_n___clipping_region.html#a89728f57e90f0d01cc57f6b8c7b9362b">ClipPlaneTolerance</a> () const</td></tr>
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<tr class="memitem:a155acc9a6ab7d5611c684545469215a3"><td class="memItemLeft" align="right" valign="top"><a class="el" href="class_o_n___xform.html">ON_Xform</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_o_n___clipping_region.html#a155acc9a6ab7d5611c684545469215a3">InverseObjectToClipTransformation</a> () const</td></tr>
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<tr class="memitem:ace4529a5f9396a04bfa03e2e37a29ba5"><td class="memItemLeft" align="right" valign="top">int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_o_n___clipping_region.html#ace4529a5f9396a04bfa03e2e37a29ba5">InViewFrustum</a> (int count, const <a class="el" href="class_o_n__3f_point.html">ON_3fPoint</a> *p) const</td></tr>
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<tr class="memitem:ae83f89849669b70db2e2e4a2f9fe3bec"><td class="memItemLeft" align="right" valign="top">int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_o_n___clipping_region.html#ae83f89849669b70db2e2e4a2f9fe3bec">InViewFrustum</a> (int count, const <a class="el" href="class_o_n__4d_point.html">ON_4dPoint</a> *p) const</td></tr>
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<tr class="memitem:a978a5f37c2ddccec2b345f179d6f3316"><td class="memItemLeft" align="right" valign="top">int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_o_n___clipping_region.html#a978a5f37c2ddccec2b345f179d6f3316">IsVisible</a> (const <a class="el" href="class_o_n___bounding_box.html">ON_BoundingBox</a> &amp;bbox) const</td></tr>
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<tr class="memitem:a1b4529cfaba907fabaa4a0222dd14f79"><td class="memItemLeft" align="right" valign="top">int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_o_n___clipping_region.html#a1b4529cfaba907fabaa4a0222dd14f79">IsVisible</a> (int count, const <a class="el" href="class_o_n__3f_point.html">ON_3fPoint</a> *p) const</td></tr>
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<tr class="memitem:ad385554b3c9d0f845f99e24809a3cf98"><td class="memItemLeft" align="right" valign="top">int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_o_n___clipping_region.html#ad385554b3c9d0f845f99e24809a3cf98">IsVisible</a> (int count, const <a class="el" href="class_o_n__3d_point.html">ON_3dPoint</a> *p) const</td></tr>
<tr class="separator:ad385554b3c9d0f845f99e24809a3cf98"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a4f216e774a4e6d52ae042933c666885f"><td class="memItemLeft" align="right" valign="top">int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_o_n___clipping_region.html#a4f216e774a4e6d52ae042933c666885f">IsVisible</a> (int count, const <a class="el" href="class_o_n__4d_point.html">ON_4dPoint</a> *p) const</td></tr>
<tr class="separator:a4f216e774a4e6d52ae042933c666885f"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a410861f6c68a7063d55109faa9f8b94d"><td class="memItemLeft" align="right" valign="top"><a class="el" href="class_o_n___xform.html">ON_Xform</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_o_n___clipping_region.html#a410861f6c68a7063d55109faa9f8b94d">ObjectToClipTransformation</a> () const</td></tr>
<tr class="separator:a410861f6c68a7063d55109faa9f8b94d"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a5f04d3bc8093b56b9d14e58490635c82"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_o_n___clipping_region.html#a5f04d3bc8093b56b9d14e58490635c82">SetClipPlaneTolerance</a> (double clip_plane_tolerance)</td></tr>
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<tr class="memitem:a02c3fabe9f78cb4b1bde47247be2609a"><td class="memItemLeft" align="right" valign="top">unsigned int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_o_n___clipping_region.html#a02c3fabe9f78cb4b1bde47247be2609a">TransformPoint</a> (const <a class="el" href="class_o_n__4d_point.html">ON_4dPoint</a> &amp;P, <a class="el" href="class_o_n__4d_point.html">ON_4dPoint</a> &amp;Q) const</td></tr>
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<tr class="memitem:a1363176e7e0d5f8304e85f3fc4ce8e13"><td class="memItemLeft" align="right" valign="top">unsigned int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_o_n___clipping_region.html#a1363176e7e0d5f8304e85f3fc4ce8e13">TransformPoint</a> (const <a class="el" href="class_o_n__3f_point.html">ON_3fPoint</a> &amp;P, <a class="el" href="class_o_n__3d_point.html">ON_3dPoint</a> &amp;Q) const</td></tr>
<tr class="separator:a1363176e7e0d5f8304e85f3fc4ce8e13"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a639c50ec392c32dbd600e114fe0ef016"><td class="memItemLeft" align="right" valign="top">int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_o_n___clipping_region.html#a639c50ec392c32dbd600e114fe0ef016">TransformPoints</a> (int count, <a class="el" href="class_o_n__4d_point.html">ON_4dPoint</a> *p) const</td></tr>
<tr class="separator:a639c50ec392c32dbd600e114fe0ef016"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:aa2c5fd9b30d26a67ade5da3abde85426"><td class="memItemLeft" align="right" valign="top">int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_o_n___clipping_region.html#aa2c5fd9b30d26a67ade5da3abde85426">TransformPoints</a> (int count, <a class="el" href="class_o_n__4d_point.html">ON_4dPoint</a> *p, unsigned int *pflags) const</td></tr>
<tr class="separator:aa2c5fd9b30d26a67ade5da3abde85426"><td class="memSeparator" colspan="2">&#160;</td></tr>
</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-attribs"></a>
Public Attributes</h2></td></tr>
<tr class="memitem:a3f02f975bf398cc464f11f0e27264495"><td class="memItemLeft" align="right" valign="top"><a class="el" href="class_o_n___plane_equation.html">ON_PlaneEquation</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_o_n___clipping_region.html#a3f02f975bf398cc464f11f0e27264495">m_clip_plane</a> [<a class="el" href="class_o_n___clipping_region.html#a630cfb58f6cb4c81050a174f2caf3822a0705e8187649b87a60fde84e06781d5a">max_clip_plane_count</a>]</td></tr>
<tr class="separator:a3f02f975bf398cc464f11f0e27264495"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:aeeaac7ec9af8658fc46660240418c645"><td class="memItemLeft" align="right" valign="top">int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_o_n___clipping_region.html#aeeaac7ec9af8658fc46660240418c645">m_clip_plane_count</a></td></tr>
<tr class="memdesc:aeeaac7ec9af8658fc46660240418c645"><td class="mdescLeft">&#160;</td><td class="mdescRight">(0 &lt;= m_clip_plane_count &lt;= max_clip_plane_count) <a href="#aeeaac7ec9af8658fc46660240418c645">More...</a><br /></td></tr>
<tr class="separator:aeeaac7ec9af8658fc46660240418c645"><td class="memSeparator" colspan="2">&#160;</td></tr>
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<h2 class="groupheader">Member Enumeration Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#a630cfb58f6cb4c81050a174f2caf3822">&#9670;&nbsp;</a></span>anonymous enum</h2>
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<tr><th colspan="2">Enumerator</th></tr><tr><td class="fieldname"><a id="a630cfb58f6cb4c81050a174f2caf3822a0705e8187649b87a60fde84e06781d5a"></a>max_clip_plane_count&#160;</td><td class="fielddoc"><p>must be &lt;= 25 </p>
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<h2 class="groupheader">Constructor &amp; Destructor Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#ac1e2510084a6196240903aca69917dec">&#9670;&nbsp;</a></span>ON_ClippingRegion()</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#a89728f57e90f0d01cc57f6b8c7b9362b">&#9670;&nbsp;</a></span>ClipPlaneTolerance()</h2>
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<p>Returns: 3d world coordinates tolerance to use when testing objects to see if the planes in m_clip_plane[] hide the objects. <br />
Remarks: The constructor sets this value to zero. Rhino uses values around 1e-5. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#a18f80972a9f7827ccfba03d703dcdec4">&#9670;&nbsp;</a></span>GetLineClipPlaneParamters()</h2>
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<td class="paramtype"><a class="el" href="class_o_n__4d_point.html">ON_4dPoint</a>&#160;</td>
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<p>Description: Calculate the interval for the segment of a line that is in the clip plane region. Parameters: P0 - [in] start point P1 - [in] end point t0 - [out] start parameter t1 - [out] end parameter Returns: True if some portion of the line is visible and 0.0 &lt;= *t0 &lt;= *t1 &lt;= 1.0. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#a192cffa87dae29b2a87eab52d307786a">&#9670;&nbsp;</a></span>InClipPlaneRegion() <span class="overload">[1/5]</span></h2>
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<td class="memname">int ON_ClippingRegion::InClipPlaneRegion </td>
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<p>Description: The "clip plane region" is the convex hull of the planes in the m_clip_plane[] array. These functions determine if some portion of the convex hull of the test points is inside the clip plane region. Parameters: P - [in] point box - [in] bounding box count - [in] number of points p - [in] array of points bEnableClippingPlanes - [in] If true, then the additional clipping planes are tested. If false, then the additional clipping planes are ignored. Returns: 0 = No part of the of the convex hull of the tested points is in the clip plane region. 1 = A portion of the convex hull of the tested points may be in the clip plane region. 2 = The entire convex hull of the tested points is in the clip plane region. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#a6ca741216e2eac2f40d7df6fd31f9d77">&#9670;&nbsp;</a></span>InClipPlaneRegion() <span class="overload">[2/5]</span></h2>
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<td class="memname">int ON_ClippingRegion::InClipPlaneRegion </td>
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<td class="memname">int ON_ClippingRegion::InClipPlaneRegion </td>
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<td class="memname">int ON_ClippingRegion::InClipPlaneRegion </td>
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<td class="memname">int ON_ClippingRegion::InClipPlaneRegion </td>
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<h2 class="memtitle"><span class="permalink"><a href="#a155acc9a6ab7d5611c684545469215a3">&#9670;&nbsp;</a></span>InverseObjectToClipTransformation()</h2>
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<td class="memname"><a class="el" href="class_o_n___xform.html">ON_Xform</a> ON_ClippingRegion::InverseObjectToClipTransformation </td>
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<h2 class="memtitle"><span class="permalink"><a href="#ae2c500c3046db968860745ea85d769d7">&#9670;&nbsp;</a></span>InViewFrustum() <span class="overload">[1/5]</span></h2>
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<p>Description: The "view frustum" is the frustum the m_xform transformation maps to clipping coordinate box (-1,+1)^3. These functions determine if some portion of the convex hull of the test points is inside the view frustum. Parameters: P - [in] point box - [in] bounding box count - [in] number of points p - [in] array of points bEnableClippingPlanes - [in] If true, then the additional clipping planes are tested. If false, then the additional clipping planes are ignored. Returns: 0 = No part of the of the convex hull of the tested points is in the view frustum. 1 = A portion of the convex hull of the otested points may be in the view frustum. 2 = The entire convex hull of the tested points is in the view frustum. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#ad96cf966c69362395d0ce987fd479545">&#9670;&nbsp;</a></span>InViewFrustum() <span class="overload">[2/5]</span></h2>
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<td class="memname">int ON_ClippingRegion::InViewFrustum </td>
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<h2 class="memtitle"><span class="permalink"><a href="#a9934f1372ed3d54944e4acda50018442">&#9670;&nbsp;</a></span>IsVisible() <span class="overload">[1/5]</span></h2>
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<p>Description: The "visible area" is the intersection of the view frustum, defined by m_xform, and the clipping region, defined by the m_clip_plane[] array. These functions determing if some portion of the convex hull of the test points is visible. Parameters: P - [in] point box - [in] bounding box count - [in] number of points p - [in] array of points Returns: 0 = no part of the object is in the region. 1 = a portion of the object is in the region 2 = entire object is in clipping region </p>
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<td class="memname">int ON_ClippingRegion::IsVisible </td>
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<td class="memname">int ON_ClippingRegion::IsVisible </td>
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<h2 class="memtitle"><span class="permalink"><a href="#a410861f6c68a7063d55109faa9f8b94d">&#9670;&nbsp;</a></span>ObjectToClipTransformation()</h2>
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<td class="memname"><a class="el" href="class_o_n___xform.html">ON_Xform</a> ON_ClippingRegion::ObjectToClipTransformation </td>
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<h2 class="memtitle"><span class="permalink"><a href="#a5f04d3bc8093b56b9d14e58490635c82">&#9670;&nbsp;</a></span>SetClipPlaneTolerance()</h2>
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<td class="memname">void ON_ClippingRegion::SetClipPlaneTolerance </td>
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<p>Parameters: clip_plane_tolerance - [in] <br />
3d world coordinates tolerance to use when testing objects to see if the planes in m_clip_plane[] hide the objects. <br />
Remarks: The constructor sets this value to zero. Rhino uses values around 1e-5. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#a999410da26abca6a31fe8da9875679db">&#9670;&nbsp;</a></span>SetObjectToClipTransformation() <span class="overload">[1/2]</span></h2>
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<td class="memname">bool ON_ClippingRegion::SetObjectToClipTransformation </td>
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<p>Description: Sets the object to clip transformation to the viewport's workd to clip transformation. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#af8ab28dc3dcf8a18e3b964365c8d3f00">&#9670;&nbsp;</a></span>SetObjectToClipTransformation() <span class="overload">[2/2]</span></h2>
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<td class="memname">bool ON_ClippingRegion::SetObjectToClipTransformation </td>
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<td class="paramname"><em>object_to_clip_transformation</em></td><td>)</td>
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<td class="memname">unsigned int ON_ClippingRegion::TransformPoint </td>
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<td class="paramtype">const <a class="el" href="class_o_n__4d_point.html">ON_4dPoint</a> &amp;&#160;</td>
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<p>Description: Transform a pont and return the clipping information. Parameters: P - [in] point ot transform Q - [out] transformed point Returns: 0 when the point is in the visible region. <br />
Otherwise the bits are set to indicate which planes clip the intput point. 0x01 left of the view frusturm 0x02 right of the view frustum 0x04 below the view frustum 0x08 above the view frustum 0x10 behind the view frustum (too far) 0x20 in front of the view frustum (too near)</p>
<p>0x10 below m_clip_plane[0] 0x20 below m_clip_plane[1] ... 0x40000000 below m_clip_plane[24]</p>
<p>0x80000000 transformation created a non-positive weight </p>
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<td class="memname">unsigned int ON_ClippingRegion::TransformPoint </td>
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<h2 class="memtitle"><span class="permalink"><a href="#a639c50ec392c32dbd600e114fe0ef016">&#9670;&nbsp;</a></span>TransformPoints() <span class="overload">[1/2]</span></h2>
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<td class="memname">int ON_ClippingRegion::TransformPoints </td>
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<p>Description: Transform a list of 4d homogenous points while testing for visibility. Parameters: count - [in] number of points p - [in/out] array of points to test and transform If 0 is returned, some of the points may not be transformed. In all other cases, the output points are transformed by m_xform. pflags - [out] 0 when the point is in the visible region. <br />
Otherwise the bits are set to indicate which planes clip the intput point. 0x01 left of the view frusturm 0x02 right of the view frustum 0x04 below the view frustum 0x08 above the view frustum 0x10 behind the view frustum (too far) 0x20 in front of the view frustum (too near)</p>
<p>0x10 below m_clip_plane[0] 0x20 below m_clip_plane[1] ... 0x40000000 below m_clip_plane[24]</p>
<p>0x80000000 transformation created a non-positive weight Returns: 0 = convex hull of the points is not in the region. The m_cull_bits field reports which plane or planes culled the point set. 1 = a portion of the convex hull is in the region. The m_cull_bits field reports which plane or planes culled the point set. 2 = all points are in the region. The m_cull_bits field will be zero. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#aa2c5fd9b30d26a67ade5da3abde85426">&#9670;&nbsp;</a></span>TransformPoints() <span class="overload">[2/2]</span></h2>
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<td class="memname">int ON_ClippingRegion::TransformPoints </td>
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<td class="paramtype">int&#160;</td>
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<h2 class="groupheader">Member Data Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#a3f02f975bf398cc464f11f0e27264495">&#9670;&nbsp;</a></span>m_clip_plane</h2>
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<td class="memname"><a class="el" href="class_o_n___plane_equation.html">ON_PlaneEquation</a> ON_ClippingRegion::m_clip_plane[<a class="el" href="class_o_n___clipping_region.html#a630cfb58f6cb4c81050a174f2caf3822a0705e8187649b87a60fde84e06781d5a">max_clip_plane_count</a>]</td>
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<h2 class="memtitle"><span class="permalink"><a href="#aeeaac7ec9af8658fc46660240418c645">&#9670;&nbsp;</a></span>m_clip_plane_count</h2>
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<td class="memname">int ON_ClippingRegion::m_clip_plane_count</td>
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<p>(0 &lt;= m_clip_plane_count &lt;= max_clip_plane_count) </p>
<p>Up to 25 additional clipping planes in object coordinates. The convex region that is the intersection of the positive side of these planes is the active region. </p>
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