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<h1>vtkViewDependentErrorMetric Class Reference</h1><!-- doxytag: class="vtkViewDependentErrorMetric" --><!-- doxytag: inherits="vtkGenericSubdivisionErrorMetric" --><code>#include <<a class="el" href="a04192.html">vtkViewDependentErrorMetric.h</a>></code>
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Inheritance diagram for vtkViewDependentErrorMetric:</div>
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<a href="a15734.html">List of all members.</a><hr><a name="_details"></a><h2>Detailed Description</h2>
Objects that compute a screen-based error during cell tessellation.
<p>
It is a concrete error metric, based on a geometric criterium in the screen space: the variation of the projected edge from a projected straight line<p>
<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="a00584.html" title="helper class to perform cell tessellation">vtkGenericCellTessellator</a> <a class="el" href="a00607.html" title="Objects that compute error during cell tessellation.">vtkGenericSubdivisionErrorMetric</a></dd></dl>
<dl class="user" compact><dt><b>Tests:</b></dt><dd><a class="el" href="c2_vtk_t_18.html#c2_vtk_t_vtkViewDependentErrorMetric">vtkViewDependentErrorMetric (Tests)</a> </dd></dl>
<p>Definition at line <a class="el" href="a04192.html#l00039">39</a> of file <a class="el" href="a04192.html">vtkViewDependentErrorMetric.h</a>.</p>
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<tr><td class="memItemLeft" nowrap align="right" valign="top">typedef <br>
<a class="el" href="a00607.html">vtkGenericSubdivisionErrorMetric</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="a01832.html#0a0393b8722bfb9bf76f917a7edf0770">Superclass</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">static int </td><td class="memItemRight" valign="bottom"><a class="el" href="a01832.html#19dbd1953a5c7cde206a4e9412a97593">IsTypeOf</a> (const char *type)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">static <br>
<a class="el" href="a01832.html">vtkViewDependentErrorMetric</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="a01832.html#7572256304b20848457a1446a5916a0b">SafeDownCast</a> (<a class="el" href="a01084.html">vtkObject</a> *o)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual const char * </td><td class="memItemRight" valign="bottom"><a class="el" href="a01832.html#e57abc37288cc0148b51c4d17c738184">GetClassName</a> ()</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual int </td><td class="memItemRight" valign="bottom"><a class="el" href="a01832.html#2553453e6ab091cf6ecda64ed85bd9d1">IsA</a> (const char *type)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="a01832.html#0ef3748655e23031e61061d0bea93b3b">PrintSelf</a> (ostream &os, <a class="el" href="a00869.html">vtkIndent</a> indent)</td></tr>
<tr><td colspan="2"><br><h2>Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="a01832.html#9ee14b22d587981c6a2c1e9b4badc7e1">SetPixelTolerance</a> (double value)</td></tr>
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<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual double </td><td class="memItemRight" valign="bottom"><a class="el" href="a01832.html#8a13c6bb18cd7a23e8c493c6eb406403">GetPixelTolerance</a> ()</td></tr>
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<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual <a class="el" href="a01833.html">vtkViewport</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="a01832.html#e499dcd48693c32abff10d7863f5e9ff">GetViewport</a> ()</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="a01832.html#f0f3aae7ca58b89006b77cedbb9edc26">SetViewport</a> (<a class="el" href="a01833.html">vtkViewport</a> *viewport)</td></tr>
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<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="a01832.html#5d12bffa8f243351fff6c1dfcabad1bb">RequiresEdgeSubdivision</a> (double *leftPoint, double *midPoint, double *rightPoint, double alpha)</td></tr>
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<tr><td class="memItemLeft" nowrap align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="a01832.html#7845193fb190a9cd04ec8e24479e9452">GetError</a> (double *leftPoint, double *midPoint, double *rightPoint, double alpha)</td></tr>
<tr><td colspan="2"><br><h2>Static Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">static <br>
<a class="el" href="a01832.html">vtkViewDependentErrorMetric</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="a01832.html#340a257728bd9146e9c5b4d52eb6852e">New</a> ()</td></tr>
<tr><td colspan="2"><br><h2>Protected Member Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="a01832.html#5e31af59fec154e9d53b2427d32dd482">vtkViewDependentErrorMetric</a> ()</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="a01832.html#73675a14298ee778008378754a7834f4">~vtkViewDependentErrorMetric</a> ()</td></tr>
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<tr><td class="memItemLeft" nowrap align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="a01832.html#fd8280ef0a03fd38d05f66427257cf05">Distance2LinePoint</a> (double x[2], double y[2], double z[2])</td></tr>
<tr><td colspan="2"><br><h2>Protected Attributes</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="a01832.html#13ca95bbd6a724c1890dcd832e8b852b">PixelTolerance</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="a01833.html">vtkViewport</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="a01832.html#134e34f023af381b65f1f80fb44128f2">Viewport</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="a00335.html">vtkCoordinate</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="a01832.html#8d22f929596e2f596463abe85d502101">Coordinate</a></td></tr>
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<hr><h2>Member Typedef Documentation</h2>
<a class="anchor" name="0a0393b8722bfb9bf76f917a7edf0770"></a><!-- doxytag: member="vtkViewDependentErrorMetric::Superclass" ref="0a0393b8722bfb9bf76f917a7edf0770" args="" -->
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<td class="memname">typedef <a class="el" href="a00607.html">vtkGenericSubdivisionErrorMetric</a> <a class="el" href="a00607.html">vtkViewDependentErrorMetric::Superclass</a> </td>
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<p>
Standard VTK type and error macros.
<p>Reimplemented from <a class="el" href="a00607.html#a0b2ec014b9569164b5b24799417920e">vtkGenericSubdivisionErrorMetric</a>.</p>
<p>Definition at line <a class="el" href="a04192.html#l00048">48</a> of file <a class="el" href="a04192.html">vtkViewDependentErrorMetric.h</a>.</p>
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<hr><h2>Constructor & Destructor Documentation</h2>
<a class="anchor" name="5e31af59fec154e9d53b2427d32dd482"></a><!-- doxytag: member="vtkViewDependentErrorMetric::vtkViewDependentErrorMetric" ref="5e31af59fec154e9d53b2427d32dd482" args="()" -->
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<td class="memname">vtkViewDependentErrorMetric::vtkViewDependentErrorMetric </td>
<td>(</td>
<td class="paramname"> </td>
<td> ) </td>
<td><code> [protected]</code></td>
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<p>
</div>
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<a class="anchor" name="73675a14298ee778008378754a7834f4"></a><!-- doxytag: member="vtkViewDependentErrorMetric::~vtkViewDependentErrorMetric" ref="73675a14298ee778008378754a7834f4" args="()" -->
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<td class="memname">vtkViewDependentErrorMetric::~vtkViewDependentErrorMetric </td>
<td>(</td>
<td class="paramname"> </td>
<td> ) </td>
<td><code> [protected]</code></td>
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<hr><h2>Member Function Documentation</h2>
<a class="anchor" name="340a257728bd9146e9c5b4d52eb6852e"></a><!-- doxytag: member="vtkViewDependentErrorMetric::New" ref="340a257728bd9146e9c5b4d52eb6852e" args="()" -->
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<td class="memname">static <a class="el" href="a01832.html">vtkViewDependentErrorMetric</a>* vtkViewDependentErrorMetric::New </td>
<td>(</td>
<td class="paramname"> </td>
<td> ) </td>
<td><code> [static]</code></td>
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<p>
Construct the error metric with a default squared screen-based geometric accuracy measured in pixels equal to 0.25 (0.5^2).
<p>Reimplemented from <a class="el" href="a01084.html#4d5b227267c076d6f9e38483370b6612">vtkObject</a>.</p>
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<a class="anchor" name="e57abc37288cc0148b51c4d17c738184"></a><!-- doxytag: member="vtkViewDependentErrorMetric::GetClassName" ref="e57abc37288cc0148b51c4d17c738184" args="()" -->
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<td class="memname">virtual const char* vtkViewDependentErrorMetric::GetClassName </td>
<td>(</td>
<td class="paramname"> </td>
<td> ) </td>
<td><code> [virtual]</code></td>
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<p>
Standard VTK type and error macros.
<p>Reimplemented from <a class="el" href="a00607.html#0b9df77911ca43eeb0714fb1b4daf85b">vtkGenericSubdivisionErrorMetric</a>.</p>
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<a class="anchor" name="19dbd1953a5c7cde206a4e9412a97593"></a><!-- doxytag: member="vtkViewDependentErrorMetric::IsTypeOf" ref="19dbd1953a5c7cde206a4e9412a97593" args="(const char *type)" -->
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<td class="memname">static int vtkViewDependentErrorMetric::IsTypeOf </td>
<td>(</td>
<td class="paramtype">const char * </td>
<td class="paramname"> <em>type</em> </td>
<td> ) </td>
<td><code> [static]</code></td>
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</table>
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<div class="memdoc">
<p>
Standard VTK type and error macros.
<p>Reimplemented from <a class="el" href="a00607.html#df5f1a0f09465ab24f7b7839ffc707ce">vtkGenericSubdivisionErrorMetric</a>.</p>
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</div><p>
<a class="anchor" name="2553453e6ab091cf6ecda64ed85bd9d1"></a><!-- doxytag: member="vtkViewDependentErrorMetric::IsA" ref="2553453e6ab091cf6ecda64ed85bd9d1" args="(const char *type)" -->
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<td class="memname">virtual int vtkViewDependentErrorMetric::IsA </td>
<td>(</td>
<td class="paramtype">const char * </td>
<td class="paramname"> <em>type</em> </td>
<td> ) </td>
<td><code> [virtual]</code></td>
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<div class="memdoc">
<p>
Standard VTK type and error macros.
<p>Reimplemented from <a class="el" href="a00607.html#938a91c7c0a3e9b9f95b452eea241d95">vtkGenericSubdivisionErrorMetric</a>.</p>
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<a class="anchor" name="7572256304b20848457a1446a5916a0b"></a><!-- doxytag: member="vtkViewDependentErrorMetric::SafeDownCast" ref="7572256304b20848457a1446a5916a0b" args="(vtkObject *o)" -->
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<td class="memname">static <a class="el" href="a01832.html">vtkViewDependentErrorMetric</a>* vtkViewDependentErrorMetric::SafeDownCast </td>
<td>(</td>
<td class="paramtype"><a class="el" href="a01084.html">vtkObject</a> * </td>
<td class="paramname"> <em>o</em> </td>
<td> ) </td>
<td><code> [static]</code></td>
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</table>
</div>
<div class="memdoc">
<p>
Standard VTK type and error macros.
<p>Reimplemented from <a class="el" href="a00607.html#92adca7e599b317994fff3754d11fac1">vtkGenericSubdivisionErrorMetric</a>.</p>
</div>
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<a class="anchor" name="0ef3748655e23031e61061d0bea93b3b"></a><!-- doxytag: member="vtkViewDependentErrorMetric::PrintSelf" ref="0ef3748655e23031e61061d0bea93b3b" args="(ostream &os, vtkIndent indent)" -->
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<td class="memname">void vtkViewDependentErrorMetric::PrintSelf </td>
<td>(</td>
<td class="paramtype">ostream & </td>
<td class="paramname"> <em>os</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="a00869.html">vtkIndent</a> </td>
<td class="paramname"> <em>indent</em></td><td> </td>
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<td></td>
<td>)</td>
<td></td><td></td><td><code> [virtual]</code></td>
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<p>
Standard VTK type and error macros.
<p>Reimplemented from <a class="el" href="a00607.html#e12923231878439ccf130d2c0b3344cb">vtkGenericSubdivisionErrorMetric</a>.</p>
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<a class="anchor" name="8a13c6bb18cd7a23e8c493c6eb406403"></a><!-- doxytag: member="vtkViewDependentErrorMetric::GetPixelTolerance" ref="8a13c6bb18cd7a23e8c493c6eb406403" args="()" -->
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<td class="memname">virtual double vtkViewDependentErrorMetric::GetPixelTolerance </td>
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Return the squared screen-based geometric accurary measured in pixels. An accuracy less or equal to 0.25 (0.5^2) ensures that the screen-space interpolation of a mid-point matchs exactly with the projection of the mid-point (a value less than 1 but greater than 0.25 is not enough, because of 8-neighbors). Maybe it is useful for lower accuracy in case of anti-aliasing? <dl class="post" compact><dt><b>Postcondition:</b></dt><dd>positive_result: result>0 </dd></dl>
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<a class="anchor" name="9ee14b22d587981c6a2c1e9b4badc7e1"></a><!-- doxytag: member="vtkViewDependentErrorMetric::SetPixelTolerance" ref="9ee14b22d587981c6a2c1e9b4badc7e1" args="(double value)" -->
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<td class="memname">void vtkViewDependentErrorMetric::SetPixelTolerance </td>
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Set the squared screen-based geometric accuracy measured in pixels. Subdivision will be required if the square distance between the projection of the real point and the straight line passing through the projection of the vertices of the edge is greater than `value'. For instance, 0.25 will give better result than 1. <dl class="pre" compact><dt><b>Precondition:</b></dt><dd>positive_value: value>0 </dd></dl>
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<a class="anchor" name="e499dcd48693c32abff10d7863f5e9ff"></a><!-- doxytag: member="vtkViewDependentErrorMetric::GetViewport" ref="e499dcd48693c32abff10d7863f5e9ff" args="()" -->
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<td class="memname">virtual <a class="el" href="a01833.html">vtkViewport</a>* vtkViewDependentErrorMetric::GetViewport </td>
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Set/Get the renderer with `renderer' on which the error metric is based. The error metric use the active camera of the renderer.
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<a class="anchor" name="f0f3aae7ca58b89006b77cedbb9edc26"></a><!-- doxytag: member="vtkViewDependentErrorMetric::SetViewport" ref="f0f3aae7ca58b89006b77cedbb9edc26" args="(vtkViewport *viewport)" -->
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<td class="memname">void vtkViewDependentErrorMetric::SetViewport </td>
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<td class="paramtype"><a class="el" href="a01833.html">vtkViewport</a> * </td>
<td class="paramname"> <em>viewport</em> </td>
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Set/Get the renderer with `renderer' on which the error metric is based. The error metric use the active camera of the renderer.
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<a class="anchor" name="5d12bffa8f243351fff6c1dfcabad1bb"></a><!-- doxytag: member="vtkViewDependentErrorMetric::RequiresEdgeSubdivision" ref="5d12bffa8f243351fff6c1dfcabad1bb" args="(double *leftPoint, double *midPoint, double *rightPoint, double alpha)" -->
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<td class="memname">int vtkViewDependentErrorMetric::RequiresEdgeSubdivision </td>
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<td class="paramtype">double * </td>
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Does the edge need to be subdivided according to the distance between the line passing through its endpoints in screen space and the projection of its mid point? The edge is defined by its `leftPoint' and its `rightPoint'. `leftPoint', `midPoint' and `rightPoint' have to be initialized before calling <a class="el" href="a01832.html#5d12bffa8f243351fff6c1dfcabad1bb">RequiresEdgeSubdivision()</a>. Their format is global coordinates, parametric coordinates and point centered attributes: xyx rst abc de... `alpha' is the normalized abscissa of the midpoint along the edge. (close to 0 means close to the left point, close to 1 means close to the right point) <dl class="pre" compact><dt><b>Precondition:</b></dt><dd>leftPoint_exists: leftPoint!=0 <p>
midPoint_exists: midPoint!=0 <p>
rightPoint_exists: rightPoint!=0 <p>
clamped_alpha: alpha>0 && alpha<1 <p>
valid_size: sizeof(leftPoint)=sizeof(midPoint)=sizeof(rightPoint) =GetAttributeCollection()->GetNumberOfPointCenteredComponents()+6 </dd></dl>
<p>Implements <a class="el" href="a00607.html#6eda4e9fc072d7f94e2746bcc36c545a">vtkGenericSubdivisionErrorMetric</a>.</p>
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<a class="anchor" name="7845193fb190a9cd04ec8e24479e9452"></a><!-- doxytag: member="vtkViewDependentErrorMetric::GetError" ref="7845193fb190a9cd04ec8e24479e9452" args="(double *leftPoint, double *midPoint, double *rightPoint, double alpha)" -->
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<td class="memname">double vtkViewDependentErrorMetric::GetError </td>
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<td class="paramname"> <em>leftPoint</em>, </td>
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<td class="paramtype">double * </td>
<td class="paramname"> <em>midPoint</em>, </td>
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<td class="paramtype">double * </td>
<td class="paramname"> <em>rightPoint</em>, </td>
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<td class="paramtype">double </td>
<td class="paramname"> <em>alpha</em></td><td> </td>
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Return the error at the mid-point. The type of error depends on the state of the concrete error metric. For instance, it can return an absolute or relative error metric. See <a class="el" href="a01832.html#5d12bffa8f243351fff6c1dfcabad1bb">RequiresEdgeSubdivision()</a> for a description of the arguments. <dl class="pre" compact><dt><b>Precondition:</b></dt><dd>leftPoint_exists: leftPoint!=0 <p>
midPoint_exists: midPoint!=0 <p>
rightPoint_exists: rightPoint!=0 <p>
clamped_alpha: alpha>0 && alpha<1 <p>
valid_size: sizeof(leftPoint)=sizeof(midPoint)=sizeof(rightPoint) =GetAttributeCollection()->GetNumberOfPointCenteredComponents()+6 </dd></dl>
<dl class="post" compact><dt><b>Postcondition:</b></dt><dd>positive_result: result>=0 </dd></dl>
<p>Implements <a class="el" href="a00607.html#07919cd89a86d00d25d6f31e9fccc5d2">vtkGenericSubdivisionErrorMetric</a>.</p>
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<a class="anchor" name="fd8280ef0a03fd38d05f66427257cf05"></a><!-- doxytag: member="vtkViewDependentErrorMetric::Distance2LinePoint" ref="fd8280ef0a03fd38d05f66427257cf05" args="(double x[2], double y[2], double z[2])" -->
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<td class="memname">double vtkViewDependentErrorMetric::Distance2LinePoint </td>
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Square distance between a straight line (defined by points x and y) and a point z. Property: if x and y are equal, the line is a point and the result is the square distance between points x and z.
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<hr><h2>Member Data Documentation</h2>
<a class="anchor" name="13ca95bbd6a724c1890dcd832e8b852b"></a><!-- doxytag: member="vtkViewDependentErrorMetric::PixelTolerance" ref="13ca95bbd6a724c1890dcd832e8b852b" args="" -->
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<td class="memname">double <a class="el" href="a01832.html#13ca95bbd6a724c1890dcd832e8b852b">vtkViewDependentErrorMetric::PixelTolerance</a><code> [protected]</code> </td>
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<p>Definition at line <a class="el" href="a04192.html#l00124">124</a> of file <a class="el" href="a04192.html">vtkViewDependentErrorMetric.h</a>.</p>
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<a class="anchor" name="134e34f023af381b65f1f80fb44128f2"></a><!-- doxytag: member="vtkViewDependentErrorMetric::Viewport" ref="134e34f023af381b65f1f80fb44128f2" args="" -->
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<td class="memname"><a class="el" href="a01833.html">vtkViewport</a>* <a class="el" href="a01832.html#134e34f023af381b65f1f80fb44128f2">vtkViewDependentErrorMetric::Viewport</a><code> [protected]</code> </td>
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<p>Definition at line <a class="el" href="a04192.html#l00125">125</a> of file <a class="el" href="a04192.html">vtkViewDependentErrorMetric.h</a>.</p>
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<a class="anchor" name="8d22f929596e2f596463abe85d502101"></a><!-- doxytag: member="vtkViewDependentErrorMetric::Coordinate" ref="8d22f929596e2f596463abe85d502101" args="" -->
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<td class="memname"><a class="el" href="a00335.html">vtkCoordinate</a>* <a class="el" href="a01832.html#8d22f929596e2f596463abe85d502101">vtkViewDependentErrorMetric::Coordinate</a><code> [protected]</code> </td>
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<p>Definition at line <a class="el" href="a04192.html#l00127">127</a> of file <a class="el" href="a04192.html">vtkViewDependentErrorMetric.h</a>.</p>
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<hr>The documentation for this class was generated from the following file:<ul>
<li>dox/Filtering/<a class="el" href="a04192.html">vtkViewDependentErrorMetric.h</a></ul>
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<hr size="1"><address style="text-align: right;"><small>Generated on Wed Jun 3 19:44:03 2009 for VTK by
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