<div dir="ltr"><div><div>Hi Guy,<br><br></div>Have you enabled the tracking of model,view and projection matrices as well as the vertex attribute aliasing?<br>I use this in my own code:<br><br>// switch on the uniforms that track the modelview and projection matrices<br>mViewer->getCamera()->getGraphicsContext()->getState()->setUseModelViewAndProjectionUniforms(true);<br></div>//proper initialization of vertex attribute<br><div>mViewer->getCamera()->getGraphicsContext()->getState()->setUseVertexAttributeAliasing(true);<br> </div><div>As vertex shader I use (untested after removing irrelevant parts, but should work):</div><div>#version 330 core<br>layout(location = 0) in vec4 position;<br>layout(location = 1) in vec3 normal;<br>layout(location = 2) in vec4 color;<br>layout(location = 3) in vec4 texCoords;<br><br>out vec2 TexCoords;<br><br>uniform mat4 osg_ModelViewProjectionMatrix;<br><br>void main()<br>{<br> gl_Position = osg_ModelViewProjectionMatrix * position;<br></div><div> TexCoords = texCoords.st;<br>}<br></div><div><br></div><div><br></div><div>you can then pick up the texture coordinates again in the fragment shader using:</div><div>in vec2 TexCoords;<br></div><div><br></div><div>Goodluck!</div><div><br></div><div>Antiro<br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Sat, Sep 16, 2017 at 12:35 AM, Volckaert, Guy (CA - MTS) <span dir="ltr"><<a href="mailto:Guy.Volckaert@meggitt.com" target="_blank">Guy.Volckaert@meggitt.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div link="#0563C1" vlink="#954F72" lang="EN-CA">
<div class="m_6710583989884086570WordSection1">
<p class="MsoNormal">Hi,<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Sorry to bother you guys... but I was wondering if you can help identify why my pass through vertex shader isn't working. In essence, if I enable the vertex shader, then the scene disappears (I only see that blue background color). If I
disable it then the scene appears correctly. No errors are generated by OSG after linking the vertex shader. I know that my fragment shader is working because if I set the gl_FragColor to red then the scene is completely red.
<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Here are my pass-thru shaders:<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">[code]<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">VERTEX SHADER<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">=============<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">attribute vec4 osg_Vertex;<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">void main( void )<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">{<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> gl_Position = osg_Vertex;<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">}<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">FRAGMENT SHADER<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">===============<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">uniform sampler2D tRttTexture;<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">void main( void )<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">{<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> vec3 vColor = texture2D( tRttTexture, gl_TexCoord[0].st ).rgb;<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> // Output color.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> gl_FragColor = vec4( vColor, 1.0 );<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">}<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">[/code]<u></u><u></u></span></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">The shader is applied on a fullscreen quad using typical Ortho2D projection. Here is the code that loads the shader which is applied to the post process geode containing a single geometry quad:<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">[code]<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">void loadShaders( )<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">{<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> osg::StateSet* pStateSet = g_pPolyGeode-><wbr>getOrCreateStateSet( );<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> osg::ref_ptr<osg::Program> pProgram = new osg::Program;<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> pProgram->setName( "PostProcessProgram" );
<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> osg::ref_ptr<osg::Shader> pVertShader = osg::Shader::readShaderFile( osg::Shader::VERTEX, osgDB::findDataFile( "shaders/osgprerender.vert" ) );<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> if( pVertShader )<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> {<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> pVertShader->setName( "osgprerender.vert" );<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> pProgram->addShader( pVertShader );<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> pProgram-><wbr>addBindAttribLocation( "osg_Vertex", 0 );<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> }<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> osg::ref_ptr<osg::Shader> pFragShader = osg::Shader::readShaderFile( osg::Shader::FRAGMENT, osgDB::findDataFile( "shaders/osgprerender.frag" ) );<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> if( pFragShader )<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> {<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> pFragShader->setName( "osgprerender.frag" );<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> pProgram->addShader( pFragShader );<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> }<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> // RTT texture.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> pStateSet->addUniform( new osg::Uniform( "tRttTexture", 0 ) );<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> pStateSet-><wbr>setAttributeAndModes( pProgram, osg::StateAttribute::ON );<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">}<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">[/code]<u></u><u></u></span></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">What am I doing wrong? I tried different variation of the shader but nothing works. Here are the variations that I tried:<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">[code]<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">VARIATION #1<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">===========<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">void main( void )<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">{<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> gl_Position = gl_Vertex;<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">}<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">VARIATION #2<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">===========<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">void main( void )<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">{<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">}<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">VARIATION #3<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">===========<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">attribute vec4 osg_Vertex;<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">void main( void )<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">{<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> gl_Position = gl_ModelViewProjectionMatrix * osg_Vertex;<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">}<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">VARIATION #4<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">===========<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">void main( void )<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">{<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> gl_Position = ftransform();<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">}<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">[/code]<u></u><u></u></span></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Any help would be really appreciated... The full source code is attached.<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Thank you!<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Cheers,<u></u><u></u></p>
<p class="MsoNormal">Guy<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1f497d">Guy Volckaert</span></b><b><span style="color:#1f497d">, ing.</span></b><span style="color:#1f497d"><br>
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