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<p class="MsoNormal">Hi Robert!<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">After a lot of hours staying up last night, this morning I found the solution. It was surprisingly easy.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">When I get back to work on Monday I will post the code that hopefully will help other people in the future. It didn’t have to be as complicated as we were going from before. Especially not with VS/PS 3.0+. Fixed-function pipeline is
all but obsolete these days.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">-M<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b>From:</b> osg-users [mailto:osg-users-bounces@lists.openscenegraph.org]
<b>On Behalf Of </b>Robert Osfield<br>
<b>Sent:</b> Saturday, April 14, 2018 2:15 AM<br>
<b>To:</b> OpenSceneGraph Users <osg-users@lists.openscenegraph.org><br>
<b>Subject:</b> EXTERNAL: Re: [osg-users] Writing texture coordinates on a mesh without going through traversal code?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">HI Marlin,<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I would hope that you can implement what you need without getting your hands dirty with internals of the OSG. It sound like you want something similar to osg::ClipPlaneNode. Have a look at osgclip to see how it works.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Robert.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On 13 April 2018 at 22:30, Rowley, Marlin R <<a href="mailto:marlin.r.rowley@lmco.com" target="_blank">marlin.r.rowley@lmco.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Hello!<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">I’m trying to generate my own texture coordinates (on-the-fly) by having a callback that runs when a piece of geometry intersects my object. So for example, I create a realworld
frustum and when my frustum has a shader that’s bound to some arbitrary object in the world. When my frustum intersects this object, I would like to generate texture coordinates on this object based on how far or near I am to the frustum’s near/far planes
(it’s perspective frustum). We had the following code for doing this:<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;background:#1E1E1E">
<span style="font-size:14.5pt;font-family:Consolas;color:#569CD6">void</span><span style="font-size:14.5pt;font-family:Consolas;color:gainsboro"> </span><span style="font-size:14.5pt;font-family:Consolas;color:#4EC9B0">ViewshedOSG</span><span style="font-size:14.5pt;font-family:Consolas;color:#B4B4B4">::</span><span style="font-size:14.5pt;font-family:Consolas;color:#C8C8C8">updateTextureCoordinates</span><span style="font-size:14.5pt;font-family:Consolas;color:#B4B4B4">()</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;background:#1E1E1E">
<span style="font-size:14.5pt;font-family:Consolas;color:#B4B4B4">{</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;background:#1E1E1E">
<span style="font-size:14.5pt;font-family:Consolas;color:#57A64A">// write the plane equation for all 3 planes</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;background:#1E1E1E">
<span style="font-size:14.5pt;font-family:Consolas;color:#57A64A">// that make up the camera view frustum. We can</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;background:#1E1E1E">
<span style="font-size:14.5pt;font-family:Consolas;color:#57A64A">// then access this from the shader to test whether</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;background:#1E1E1E">
<span style="font-size:14.5pt;font-family:Consolas;color:#57A64A">// we are in the frustum's volume or not.</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;background:#1E1E1E">
<span style="font-size:14.5pt;font-family:Consolas;color:gainsboro"> </span><span style="font-size:14.5pt;font-family:Consolas;color:#C8C8C8">osg</span><span style="font-size:14.5pt;font-family:Consolas;color:#B4B4B4">::</span><span style="font-size:14.5pt;font-family:Consolas;color:#4EC9B0">Matrixd</span><span style="font-size:14.5pt;font-family:Consolas;color:gainsboro"> </span><span style="font-size:14.5pt;font-family:Consolas;color:#C8C8C8">projection</span><span style="font-size:14.5pt;font-family:Consolas;color:gainsboro"> </span><span style="font-size:14.5pt;font-family:Consolas;color:#B4B4B4">=</span><span style="font-size:14.5pt;font-family:Consolas;color:gainsboro"> </span><span style="font-size:14.5pt;font-family:Consolas;color:#DADADA">mCamera</span><span style="font-size:14.5pt;font-family:Consolas;color:#B4B4B4">-></span><span style="font-size:14.5pt;font-family:Consolas;color:#C8C8C8">getViewMatrix</span><span style="font-size:14.5pt;font-family:Consolas;color:#B4B4B4">();</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;background:#1E1E1E">
<span style="font-size:14.5pt;font-family:Consolas;color:gainsboro"> </span>
<span style="font-size:14.5pt;font-family:Consolas;color:#DADADA">mTexGen</span><span style="font-size:14.5pt;font-family:Consolas;color:#B4B4B4">-></span><span style="font-size:14.5pt;font-family:Consolas;color:#C8C8C8">setPlanesFromMatrix</span><span style="font-size:14.5pt;font-family:Consolas;color:#B4B4B4">(</span><span style="font-size:14.5pt;font-family:Consolas;color:#C8C8C8">projection</span><span style="font-size:14.5pt;font-family:Consolas;color:gainsboro"> </span><span style="font-size:14.5pt;font-family:Consolas;color:#B4B4B4">*</span><span style="font-size:14.5pt;font-family:Consolas;color:gainsboro"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;background:#1E1E1E">
<span style="font-size:14.5pt;font-family:Consolas;color:gainsboro"> </span>
<span style="font-size:14.5pt;font-family:Consolas;color:#C8C8C8">osg</span><span style="font-size:14.5pt;font-family:Consolas;color:#B4B4B4">::</span><span style="font-size:14.5pt;font-family:Consolas;color:#4EC9B0">Matrix</span><span style="font-size:14.5pt;font-family:Consolas;color:#B4B4B4">::</span><span style="font-size:14.5pt;font-family:Consolas;color:#C8C8C8">translate</span><span style="font-size:14.5pt;font-family:Consolas;color:#B4B4B4">(</span><span style="font-size:14.5pt;font-family:Consolas;color:#B5CEA8">1.0</span><span style="font-size:14.5pt;font-family:Consolas;color:#B4B4B4">,</span><span style="font-size:14.5pt;font-family:Consolas;color:gainsboro"> </span><span style="font-size:14.5pt;font-family:Consolas;color:#B5CEA8">1.0</span><span style="font-size:14.5pt;font-family:Consolas;color:#B4B4B4">,</span><span style="font-size:14.5pt;font-family:Consolas;color:gainsboro"> </span><span style="font-size:14.5pt;font-family:Consolas;color:#B5CEA8">1.0</span><span style="font-size:14.5pt;font-family:Consolas;color:#B4B4B4">)</span><span style="font-size:14.5pt;font-family:Consolas;color:gainsboro"> </span><span style="font-size:14.5pt;font-family:Consolas;color:#B4B4B4">*</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;background:#1E1E1E">
<span style="font-size:14.5pt;font-family:Consolas;color:gainsboro"> </span>
<span style="font-size:14.5pt;font-family:Consolas;color:#C8C8C8">osg</span><span style="font-size:14.5pt;font-family:Consolas;color:#B4B4B4">::</span><span style="font-size:14.5pt;font-family:Consolas;color:#4EC9B0">Matrix</span><span style="font-size:14.5pt;font-family:Consolas;color:#B4B4B4">::</span><span style="font-size:14.5pt;font-family:Consolas;color:#C8C8C8">scale</span><span style="font-size:14.5pt;font-family:Consolas;color:#B4B4B4">(</span><span style="font-size:14.5pt;font-family:Consolas;color:#B5CEA8">0.5f</span><span style="font-size:14.5pt;font-family:Consolas;color:#B4B4B4">,</span><span style="font-size:14.5pt;font-family:Consolas;color:gainsboro"> </span><span style="font-size:14.5pt;font-family:Consolas;color:#B5CEA8">0.5f</span><span style="font-size:14.5pt;font-family:Consolas;color:#B4B4B4">,</span><span style="font-size:14.5pt;font-family:Consolas;color:gainsboro"> </span><span style="font-size:14.5pt;font-family:Consolas;color:#B5CEA8">0.5f</span><span style="font-size:14.5pt;font-family:Consolas;color:#B4B4B4">));</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;background:#1E1E1E">
<span style="font-size:14.5pt;font-family:Consolas;color:#57A64A">// Bring our models viewspace coordinates back</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;background:#1E1E1E">
<span style="font-size:14.5pt;font-family:Consolas;color:#57A64A">// into model space coordinate of the camera frustum</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;background:#1E1E1E">
<span style="font-size:14.5pt;font-family:Consolas;color:#C8C8C8">osg</span><span style="font-size:14.5pt;font-family:Consolas;color:#B4B4B4">::</span><span style="font-size:14.5pt;font-family:Consolas;color:#4EC9B0">RefMatrix</span><span style="font-size:14.5pt;font-family:Consolas;color:gainsboro"> </span><span style="font-size:14.5pt;font-family:Consolas;color:#B4B4B4">*</span><span style="font-size:14.5pt;font-family:Consolas;color:gainsboro"> </span><span style="font-size:14.5pt;font-family:Consolas;color:#C8C8C8">refMatrix</span><span style="font-size:14.5pt;font-family:Consolas;color:gainsboro"> </span><span style="font-size:14.5pt;font-family:Consolas;color:#B4B4B4">=</span><span style="font-size:14.5pt;font-family:Consolas;color:gainsboro"> </span><span style="font-size:14.5pt;font-family:Consolas;color:#569CD6">new</span><span style="font-size:14.5pt;font-family:Consolas;color:gainsboro"> </span><span style="font-size:14.5pt;font-family:Consolas;color:#C8C8C8">osg</span><span style="font-size:14.5pt;font-family:Consolas;color:#B4B4B4">::</span><span style="font-size:14.5pt;font-family:Consolas;color:#4EC9B0">RefMatrix</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;background:#1E1E1E">
<span style="font-size:14.5pt;font-family:Consolas;color:gainsboro"> </span>
<span style="font-size:14.5pt;font-family:Consolas;color:#B4B4B4">(</span><span style="font-size:14.5pt;font-family:Consolas;color:#DADADA">mCamera</span><span style="font-size:14.5pt;font-family:Consolas;color:#B4B4B4">-></span><span style="font-size:14.5pt;font-family:Consolas;color:#C8C8C8">getInverseViewMatrix</span><span style="font-size:14.5pt;font-family:Consolas;color:#B4B4B4">()</span><span style="font-size:14.5pt;font-family:Consolas;color:gainsboro"> </span><span style="font-size:14.5pt;font-family:Consolas;color:#B4B4B4">*</span><span style="font-size:14.5pt;font-family:Consolas;color:gainsboro"> </span><span style="font-size:14.5pt;font-family:Consolas;color:#B4B4B4">*</span><span style="font-size:14.5pt;font-family:Consolas;color:gainsboro">_cv</span><span style="font-size:14.5pt;font-family:Consolas;color:#B4B4B4">-></span><span style="font-size:14.5pt;font-family:Consolas;color:gainsboro">getModelViewMatrix</span><span style="font-size:14.5pt;font-family:Consolas;color:#B4B4B4">());</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;background:#1E1E1E">
<span style="font-size:14.5pt;font-family:Consolas;color:#57A64A">// Copy the texture generator to the mesh where you </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;background:#1E1E1E">
<span style="font-size:14.5pt;font-family:Consolas;color:#57A64A">// can index it's coordinates from the ViewshedID</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;background:#1E1E1E">
<span style="font-size:14.5pt;font-family:Consolas;color:gainsboro"> _cv</span><span style="font-size:14.5pt;font-family:Consolas;color:#B4B4B4">-></span><span style="font-size:14.5pt;font-family:Consolas;color:gainsboro">getRenderStage</span><span style="font-size:14.5pt;font-family:Consolas;color:#B4B4B4">()-></span><span style="font-size:14.5pt;font-family:Consolas;color:gainsboro">getPositionalStateContainer</span><span style="font-size:14.5pt;font-family:Consolas;color:#B4B4B4">()-></span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;background:#1E1E1E">
<span style="font-size:14.5pt;font-family:Consolas;color:gainsboro"> addPositionedTextureAttribute</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;background:#1E1E1E">
<span style="font-size:14.5pt;font-family:Consolas;color:gainsboro"> </span>
<span style="font-size:14.5pt;font-family:Consolas;color:#B4B4B4">(</span><span style="font-size:14.5pt;font-family:Consolas;color:#DADADA">mId</span><span style="font-size:14.5pt;font-family:Consolas;color:#B4B4B4">,</span><span style="font-size:14.5pt;font-family:Consolas;color:gainsboro"> </span><span style="font-size:14.5pt;font-family:Consolas;color:#C8C8C8">refMatrix</span><span style="font-size:14.5pt;font-family:Consolas;color:#B4B4B4">,</span><span style="font-size:14.5pt;font-family:Consolas;color:gainsboro"> </span><span style="font-size:14.5pt;font-family:Consolas;color:#DADADA">mTexGen</span><span style="font-size:14.5pt;font-family:Consolas;color:#B4B4B4">.</span><span style="font-size:14.5pt;font-family:Consolas;color:#C8C8C8">get</span><span style="font-size:14.5pt;font-family:Consolas;color:#B4B4B4">());</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;background:#1E1E1E">
<span style="font-size:14.5pt;font-family:Consolas;color:#B4B4B4">}</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">However, this code was based on a cull visitor calling this function from a callback. I have my own callback and it’s not based on a visitor. Is there anyway to get the objects
modelview matrix() without calling it from a cull visitor? Also only need to write the ‘addPositionedTextureAttribute’ on the geometry in order to access the coordinates through a shader.<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">I’m trying to keep this simple. Am I in the right direction?<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Thanks,<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">-M<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1F497D">----------------------------------------</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1F497D">Marlin Rowley</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1F497D">Software Engineer, Staff</span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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