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POShader and opengl transformations
 

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  1. POShader and opengl transformations
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    <p>When i add shaders (in cg) to my opengl program all the local transformations (glRotatef, glTranslatef and glScalef between glPushMatrix and glPopMatrix) stop working. Transforms outside push/pop still working though. So what might be the problem here?</p> <p>update: I have a rotating cube in the center of the scene:</p> <pre><code>glPushMatrix(); glRotatef(angle, 1, 0, 0); drawBox(); glPopMatrix(); </code></pre> <p>and after that i send worldview and worldviewprojection matrices to shader:</p> <pre><code>cgGLSetStateMatrixParameter( myCgVertexParam_modelViewProj, CG_GL_MODELVIEW_PROJECTION_MATRIX, CG_GL_MATRIX_IDENTITY ); cgGLSetStateMatrixParameter( myCgVertexParam_modelView, CG_GL_MODELVIEW_MATRIX, CG_GL_MATRIX_IDENTITY ); </code></pre> <p>Vertex shader code:</p> <pre><code>void C9E2v_fog(float4 position : POSITION, float4 color : COLOR, out float4 oPosition : POSITION, out float4 oColor : COLOR, out float fogExponent : TEXCOORD1, uniform float fogDensity, // Based on log2 uniform float4x4 modelViewProj : MODELVIEW_PROJECTION_MATRIX, uniform float4x4 modelView : MODELVIEW_MATRIX) { // Assume nonprojective modelview matrix float3 eyePosition = mul(modelView, position).xyz; float fogDistance = length(eyePosition); fogExponent = fogDistance * fogDensity; oPosition = mul(modelViewProj, position); //oDecalCoords = decalCoords; oColor = color; } </code></pre> <p>So in the end cube doesnt rotate, but if i do write (no push/pop)</p> <pre><code>glRotatef(angle, 1, 0, 0); drawBox(); </code></pre> <p>everything works fine. How do i fix that?</p>
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    1. USspacevillain
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      1. VTUpMod
    1. COCan you elaborate on "stop working"? Specify expected output and actual output... Some sample code would not be amiss either.
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      1. USLarsH
    2. COi updated the main post, please check it
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      1. USspacevillain
 

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