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<h1>vtkSobelGradientMagnitudePass Class Reference</h1><!-- doxytag: class="vtkSobelGradientMagnitudePass" --><!-- doxytag: inherits="vtkRenderPass" --><code>#include <<a class="el" href="a05344.html">vtkSobelGradientMagnitudePass.h</a>></code>
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Inheritance diagram for vtkSobelGradientMagnitudePass:</div>
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Collaboration diagram for vtkSobelGradientMagnitudePass:</div>
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<a href="a14544.html">List of all members.</a><hr><a name="_details"></a><h2>Detailed Description</h2>
Implement a post-processing edge detection with a Sobel gradient magnitude render pass.
<p>
Detect the edges of the image renderered by its delegate. Edge-detection uses a Sobel high-pass filter (3x3 kernel).<p>
This pass expects an initialized depth buffer and color buffer. Initialized buffers means they have been cleared with farest z-value and background color/gradient/transparent color. An opaque pass may have been performed right after the initialization.<p>
The delegate is used once.<p>
Its delegate is usually set to a <a class="el" href="a00230.html" title="Implement the camera render pass.">vtkCameraPass</a> or to a post-processing pass.<p>
This pass requires a OpenGL context that supports texture objects (TO), framebuffer objects (FBO) and GLSL. If not, it will emit an error message and will render its delegate and return.<p>
<dl class="user" compact><dt><b>Implementation:</b></dt><dd>To compute the gradient magnitude, the x and y components of the gradient (Gx and Gy) have to be computed first. Each computation of Gx and Gy uses a separable filter. The first pass takes the image from the delegate as the single input texture. The first pass has two outputs, one for the first part of Gx, Gx1, result of a convolution with (-1 0 1), one for the first part of Gy, Gy1, result of a convolution with (1 2 1). The second pass has two inputs, Gx1 and Gy1. Kernel (1 2 1)^T is applied to Gx1 and kernel (-1 0 1)^T is applied to Gx2. It gives the values for Gx and Gy. Thoses values are then used to compute the magnitude of the gradient which is stored in the render target. The gradient computation happens per component (R,G,B). A is arbitrarly set to 1 (full opacity).</dd></dl>
<dl class="user" compact><dt><b>Implementation:</b></dt><dd><div align="center">
<img src="vtkSobelGradientMagnitudePassFigure.png" alt="vtkSobelGradientMagnitudePassFigure.png">
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<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="a01485.html" title="Perform part of the rendering of a vtkRenderer.">vtkRenderPass</a></dd></dl>
<dl class="user" compact><dt><b>Tests:</b></dt><dd><a class="el" href="c2_vtk_t_15.html#c2_vtk_t_vtkSobelGradientMagnitudePass">vtkSobelGradientMagnitudePass (Tests)</a> </dd></dl>
<p>Definition at line <a class="el" href="a05344.html#l00074">74</a> of file <a class="el" href="a05344.html">vtkSobelGradientMagnitudePass.h</a>.</p>
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<tr><td colspan="2"><br><h2>Public Types</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">typedef <a class="el" href="a01485.html">vtkRenderPass</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="a01567.html#55431d25d2efc03d56196ac61ba6181e">Superclass</a></td></tr>
<tr><td colspan="2"><br><h2>Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual const char * </td><td class="memItemRight" valign="bottom"><a class="el" href="a01567.html#bbbb06441c8e0179a8cf715c3e3e7a1d">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="a01567.html#40b2a901e1c5298fb84f8cd0ec788d22">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="a01567.html#118b5a5152ed3fc6c7e68c846beeee0f">PrintSelf</a> (ostream &os, <a class="el" href="a00869.html">vtkIndent</a> indent)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="a01567.html#7d9491685b893a785236c9f8e88a854e">Render</a> (const <a class="el" href="a01487.html">vtkRenderState</a> *s)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="a01567.html#c04295f3c5956a06573f2439ae02f66a">ReleaseGraphicsResources</a> (<a class="el" href="a01886.html">vtkWindow</a> *w)</td></tr>
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<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual <a class="el" href="a01485.html">vtkRenderPass</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="a01567.html#5232179df149c4234fdd86d1d5266df5">GetDelegatePass</a> ()</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="a01567.html#5988e10963fabb520dbf6afdc147bca7">SetDelegatePass</a> (<a class="el" href="a01485.html">vtkRenderPass</a> *delegatePass)</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="a01567.html">vtkSobelGradientMagnitudePass</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="a01567.html#5b0eefb73f746ad9129b651e60b1ceff">New</a> ()</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">static int </td><td class="memItemRight" valign="bottom"><a class="el" href="a01567.html#269ee0588fa83ded3bcd179f5e7579c3">IsTypeOf</a> (const char *type)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">static <br>
<a class="el" href="a01567.html">vtkSobelGradientMagnitudePass</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="a01567.html#9fbfa154327a528bceb467f3fc9da88b">SafeDownCast</a> (<a class="el" href="a01084.html">vtkObject</a> *o)</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="a01567.html#187807a1426c64b19316a7d9f35735b2">vtkSobelGradientMagnitudePass</a> ()</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual </td><td class="memItemRight" valign="bottom"><a class="el" href="a01567.html#e1312a5641b9301700435d759fd34c7b">~vtkSobelGradientMagnitudePass</a> ()</td></tr>
<tr><td colspan="2"><br><h2>Protected Attributes</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="a01485.html">vtkRenderPass</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="a01567.html#1337561ab713c06e7eaec67dcf0f6751">DelegatePass</a></td></tr>
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<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="a00563.html">vtkFrameBufferObject</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="a01567.html#821f31f3673f17f20e6ac62cbfa30374">FrameBufferObject</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="a01701.html">vtkTextureObject</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="a01567.html#ebfdbc4e65398f2082e9222cad94f92a">Pass1</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="a01701.html">vtkTextureObject</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="a01567.html#d89ab7878f9aa685a4cc05a887abb89f">Gx1</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="a01701.html">vtkTextureObject</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="a01567.html#ddcd12a194a3d214e81456f0fd8cb32c">Gy1</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="a01538.html">vtkShaderProgram2</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="a01567.html#b32d1355288ef3f83a631488d1f74c06">Program1</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="a01538.html">vtkShaderProgram2</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="a01567.html#0d346cc53d1e82cca1849429fde15150">Program2</a></td></tr>
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<hr><h2>Member Typedef Documentation</h2>
<a class="anchor" name="55431d25d2efc03d56196ac61ba6181e"></a><!-- doxytag: member="vtkSobelGradientMagnitudePass::Superclass" ref="55431d25d2efc03d56196ac61ba6181e" args="" -->
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<td class="memname">typedef <a class="el" href="a01485.html">vtkRenderPass</a> <a class="el" href="a01485.html">vtkSobelGradientMagnitudePass::Superclass</a> </td>
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<p>
<p>Reimplemented from <a class="el" href="a01485.html#7d46e12c5bb3c6f3bca9e6384b902e85">vtkRenderPass</a>.</p>
<p>Definition at line <a class="el" href="a05344.html#l00078">78</a> of file <a class="el" href="a05344.html">vtkSobelGradientMagnitudePass.h</a>.</p>
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<hr><h2>Constructor & Destructor Documentation</h2>
<a class="anchor" name="187807a1426c64b19316a7d9f35735b2"></a><!-- doxytag: member="vtkSobelGradientMagnitudePass::vtkSobelGradientMagnitudePass" ref="187807a1426c64b19316a7d9f35735b2" args="()" -->
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<td class="memname">vtkSobelGradientMagnitudePass::vtkSobelGradientMagnitudePass </td>
<td>(</td>
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<td><code> [protected]</code></td>
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Default constructor. DelegatePass is set to NULL.
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<a class="anchor" name="e1312a5641b9301700435d759fd34c7b"></a><!-- doxytag: member="vtkSobelGradientMagnitudePass::~vtkSobelGradientMagnitudePass" ref="e1312a5641b9301700435d759fd34c7b" args="()" -->
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<td class="memname">virtual vtkSobelGradientMagnitudePass::~vtkSobelGradientMagnitudePass </td>
<td>(</td>
<td class="paramname"> </td>
<td> ) </td>
<td><code> [protected, virtual]</code></td>
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Destructor.
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<hr><h2>Member Function Documentation</h2>
<a class="anchor" name="5b0eefb73f746ad9129b651e60b1ceff"></a><!-- doxytag: member="vtkSobelGradientMagnitudePass::New" ref="5b0eefb73f746ad9129b651e60b1ceff" args="()" -->
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<td class="memname">static <a class="el" href="a01567.html">vtkSobelGradientMagnitudePass</a>* vtkSobelGradientMagnitudePass::New </td>
<td>(</td>
<td class="paramname"> </td>
<td> ) </td>
<td><code> [static]</code></td>
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Create an object with Debug turned off, modified time initialized to zero, and reference counting on.
<p>Reimplemented from <a class="el" href="a01084.html#4d5b227267c076d6f9e38483370b6612">vtkObject</a>.</p>
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<a class="anchor" name="bbbb06441c8e0179a8cf715c3e3e7a1d"></a><!-- doxytag: member="vtkSobelGradientMagnitudePass::GetClassName" ref="bbbb06441c8e0179a8cf715c3e3e7a1d" args="()" -->
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<td class="memname">virtual const char* vtkSobelGradientMagnitudePass::GetClassName </td>
<td>(</td>
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<td><code> [virtual]</code></td>
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<p>Reimplemented from <a class="el" href="a01485.html#4fa0f5974948dd3e880f0e38609b240b">vtkRenderPass</a>.</p>
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<a class="anchor" name="269ee0588fa83ded3bcd179f5e7579c3"></a><!-- doxytag: member="vtkSobelGradientMagnitudePass::IsTypeOf" ref="269ee0588fa83ded3bcd179f5e7579c3" args="(const char *type)" -->
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<td class="memname">static int vtkSobelGradientMagnitudePass::IsTypeOf </td>
<td>(</td>
<td class="paramtype">const char * </td>
<td class="paramname"> <em>name</em> </td>
<td> ) </td>
<td><code> [static]</code></td>
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<p>
Return 1 if this class type is the same type of (or a subclass of) the named class. Returns 0 otherwise. This method works in combination with vtkTypeRevisionMacro found in vtkSetGet.h.
<p>Reimplemented from <a class="el" href="a01485.html#abd3fc851cd94a491579a4657cc08375">vtkRenderPass</a>.</p>
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<a class="anchor" name="40b2a901e1c5298fb84f8cd0ec788d22"></a><!-- doxytag: member="vtkSobelGradientMagnitudePass::IsA" ref="40b2a901e1c5298fb84f8cd0ec788d22" args="(const char *type)" -->
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<td class="memname">virtual int vtkSobelGradientMagnitudePass::IsA </td>
<td>(</td>
<td class="paramtype">const char * </td>
<td class="paramname"> <em>name</em> </td>
<td> ) </td>
<td><code> [virtual]</code></td>
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<p>
Return 1 if this class is the same type of (or a subclass of) the named class. Returns 0 otherwise. This method works in combination with vtkTypeRevisionMacro found in vtkSetGet.h.
<p>Reimplemented from <a class="el" href="a01485.html#5a216c68cd9bfec1bfcc2cf01f4d45c4">vtkRenderPass</a>.</p>
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<a class="anchor" name="9fbfa154327a528bceb467f3fc9da88b"></a><!-- doxytag: member="vtkSobelGradientMagnitudePass::SafeDownCast" ref="9fbfa154327a528bceb467f3fc9da88b" args="(vtkObject *o)" -->
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<td class="memname">static <a class="el" href="a01567.html">vtkSobelGradientMagnitudePass</a>* vtkSobelGradientMagnitudePass::SafeDownCast </td>
<td>(</td>
<td class="paramtype"><a class="el" href="a01084.html">vtkObject</a> * </td>
<td class="paramname"> <em>o</em> </td>
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<td><code> [static]</code></td>
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<p>Reimplemented from <a class="el" href="a01485.html#fc4a69eda64c5df5a01bf500eadaccd5">vtkRenderPass</a>.</p>
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<a class="anchor" name="118b5a5152ed3fc6c7e68c846beeee0f"></a><!-- doxytag: member="vtkSobelGradientMagnitudePass::PrintSelf" ref="118b5a5152ed3fc6c7e68c846beeee0f" args="(ostream &os, vtkIndent indent)" -->
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<td class="memname">void vtkSobelGradientMagnitudePass::PrintSelf </td>
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<td class="paramname"> <em>indent</em></td><td> </td>
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<td>)</td>
<td></td><td></td><td><code> [virtual]</code></td>
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Methods invoked by print to print information about the object including superclasses. Typically not called by the user (use <a class="el" href="a01085.html#edadf6378465fd81c2592ef64262e2a5">Print()</a> instead) but used in the hierarchical print process to combine the output of several classes.
<p>Reimplemented from <a class="el" href="a01485.html#c9a79594183476baa2f8ff082e76222e">vtkRenderPass</a>.</p>
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<a class="anchor" name="7d9491685b893a785236c9f8e88a854e"></a><!-- doxytag: member="vtkSobelGradientMagnitudePass::Render" ref="7d9491685b893a785236c9f8e88a854e" args="(const vtkRenderState *s)" -->
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<td class="memname">virtual void vtkSobelGradientMagnitudePass::Render </td>
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Perform rendering according to a render state <code>s</code>. <dl class="pre" compact><dt><b>Precondition:</b></dt><dd>s_exists: s!=0 </dd></dl>
<p>Implements <a class="el" href="a01485.html#e294a805df37151e743034fd59c2f377">vtkRenderPass</a>.</p>
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<a class="anchor" name="c04295f3c5956a06573f2439ae02f66a"></a><!-- doxytag: member="vtkSobelGradientMagnitudePass::ReleaseGraphicsResources" ref="c04295f3c5956a06573f2439ae02f66a" args="(vtkWindow *w)" -->
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<td class="memname">void vtkSobelGradientMagnitudePass::ReleaseGraphicsResources </td>
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<td class="paramname"> <em>w</em> </td>
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Release graphics resources and ask components to release their own resources. <dl class="pre" compact><dt><b>Precondition:</b></dt><dd>w_exists: w!=0 </dd></dl>
<p>Reimplemented from <a class="el" href="a01485.html#8190d964eef4e437093bba6761e3371b">vtkRenderPass</a>.</p>
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<a class="anchor" name="5232179df149c4234fdd86d1d5266df5"></a><!-- doxytag: member="vtkSobelGradientMagnitudePass::GetDelegatePass" ref="5232179df149c4234fdd86d1d5266df5" args="()" -->
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<td class="memname">virtual <a class="el" href="a01485.html">vtkRenderPass</a>* vtkSobelGradientMagnitudePass::GetDelegatePass </td>
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Delegate for rendering the image to be blurred. If it is NULL, nothing will be rendered and a warning will be emitted. It is usually set to a <a class="el" href="a00230.html" title="Implement the camera render pass.">vtkCameraPass</a> or to a post-processing pass. Initial value is a NULL pointer.
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<a class="anchor" name="5988e10963fabb520dbf6afdc147bca7"></a><!-- doxytag: member="vtkSobelGradientMagnitudePass::SetDelegatePass" ref="5988e10963fabb520dbf6afdc147bca7" args="(vtkRenderPass *delegatePass)" -->
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<td class="memname">virtual void vtkSobelGradientMagnitudePass::SetDelegatePass </td>
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<td class="paramtype"><a class="el" href="a01485.html">vtkRenderPass</a> * </td>
<td class="paramname"> <em>delegatePass</em> </td>
<td> ) </td>
<td><code> [virtual]</code></td>
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Delegate for rendering the image to be blurred. If it is NULL, nothing will be rendered and a warning will be emitted. It is usually set to a <a class="el" href="a00230.html" title="Implement the camera render pass.">vtkCameraPass</a> or to a post-processing pass. Initial value is a NULL pointer.
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<hr><h2>Member Data Documentation</h2>
<a class="anchor" name="1337561ab713c06e7eaec67dcf0f6751"></a><!-- doxytag: member="vtkSobelGradientMagnitudePass::DelegatePass" ref="1337561ab713c06e7eaec67dcf0f6751" args="" -->
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<td class="memname"><a class="el" href="a01485.html">vtkRenderPass</a>* <a class="el" href="a01567.html#1337561ab713c06e7eaec67dcf0f6751">vtkSobelGradientMagnitudePass::DelegatePass</a><code> [protected]</code> </td>
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<p>Definition at line <a class="el" href="a05344.html#l00105">105</a> of file <a class="el" href="a05344.html">vtkSobelGradientMagnitudePass.h</a>.</p>
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<a class="anchor" name="821f31f3673f17f20e6ac62cbfa30374"></a><!-- doxytag: member="vtkSobelGradientMagnitudePass::FrameBufferObject" ref="821f31f3673f17f20e6ac62cbfa30374" args="" -->
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<td class="memname"><a class="el" href="a00563.html">vtkFrameBufferObject</a>* <a class="el" href="a01567.html#821f31f3673f17f20e6ac62cbfa30374">vtkSobelGradientMagnitudePass::FrameBufferObject</a><code> [protected]</code> </td>
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Graphics resources.
<p>Definition at line <a class="el" href="a05344.html#l00109">109</a> of file <a class="el" href="a05344.html">vtkSobelGradientMagnitudePass.h</a>.</p>
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<a class="anchor" name="ebfdbc4e65398f2082e9222cad94f92a"></a><!-- doxytag: member="vtkSobelGradientMagnitudePass::Pass1" ref="ebfdbc4e65398f2082e9222cad94f92a" args="" -->
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<td class="memname"><a class="el" href="a01701.html">vtkTextureObject</a>* <a class="el" href="a01567.html#ebfdbc4e65398f2082e9222cad94f92a">vtkSobelGradientMagnitudePass::Pass1</a><code> [protected]</code> </td>
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Graphics resources.
<p>Definition at line <a class="el" href="a05344.html#l00110">110</a> of file <a class="el" href="a05344.html">vtkSobelGradientMagnitudePass.h</a>.</p>
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<a class="anchor" name="d89ab7878f9aa685a4cc05a887abb89f"></a><!-- doxytag: member="vtkSobelGradientMagnitudePass::Gx1" ref="d89ab7878f9aa685a4cc05a887abb89f" args="" -->
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<td class="memname"><a class="el" href="a01701.html">vtkTextureObject</a>* <a class="el" href="a01567.html#d89ab7878f9aa685a4cc05a887abb89f">vtkSobelGradientMagnitudePass::Gx1</a><code> [protected]</code> </td>
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Graphics resources.
<p>Definition at line <a class="el" href="a05344.html#l00111">111</a> of file <a class="el" href="a05344.html">vtkSobelGradientMagnitudePass.h</a>.</p>
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<a class="anchor" name="ddcd12a194a3d214e81456f0fd8cb32c"></a><!-- doxytag: member="vtkSobelGradientMagnitudePass::Gy1" ref="ddcd12a194a3d214e81456f0fd8cb32c" args="" -->
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<td class="memname"><a class="el" href="a01701.html">vtkTextureObject</a>* <a class="el" href="a01567.html#ddcd12a194a3d214e81456f0fd8cb32c">vtkSobelGradientMagnitudePass::Gy1</a><code> [protected]</code> </td>
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<p>
Graphics resources.
<p>Definition at line <a class="el" href="a05344.html#l00112">112</a> of file <a class="el" href="a05344.html">vtkSobelGradientMagnitudePass.h</a>.</p>
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<a class="anchor" name="b32d1355288ef3f83a631488d1f74c06"></a><!-- doxytag: member="vtkSobelGradientMagnitudePass::Program1" ref="b32d1355288ef3f83a631488d1f74c06" args="" -->
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<td class="memname"><a class="el" href="a01538.html">vtkShaderProgram2</a>* <a class="el" href="a01567.html#b32d1355288ef3f83a631488d1f74c06">vtkSobelGradientMagnitudePass::Program1</a><code> [protected]</code> </td>
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<p>
Graphics resources.
<p>Definition at line <a class="el" href="a05344.html#l00113">113</a> of file <a class="el" href="a05344.html">vtkSobelGradientMagnitudePass.h</a>.</p>
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<a class="anchor" name="0d346cc53d1e82cca1849429fde15150"></a><!-- doxytag: member="vtkSobelGradientMagnitudePass::Program2" ref="0d346cc53d1e82cca1849429fde15150" args="" -->
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<td class="memname"><a class="el" href="a01538.html">vtkShaderProgram2</a>* <a class="el" href="a01567.html#0d346cc53d1e82cca1849429fde15150">vtkSobelGradientMagnitudePass::Program2</a><code> [protected]</code> </td>
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<p>
Graphics resources.
<p>Definition at line <a class="el" href="a05344.html#l00114">114</a> of file <a class="el" href="a05344.html">vtkSobelGradientMagnitudePass.h</a>.</p>
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<hr>The documentation for this class was generated from the following file:<ul>
<li>dox/Rendering/<a class="el" href="a05344.html">vtkSobelGradientMagnitudePass.h</a></ul>
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<hr size="1"><address style="text-align: right;"><small>Generated on Wed Jun 3 19:34:56 2009 for VTK by
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