Please disregard the post below. I was resetting the vertex data elsewhere. Thanks, Mike
________________________________ From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Schmidt, Michael M Sent: Monday, December 10, 2007 2:38 PM To: osg-users@lists.openscenegraph.org Subject: [osg-users] Shader Vertex Problems Hi, I'm getting odd behavior with a vertex shader. The following pseudo-code snippets do not produce the same results. Can anyone tell me why? Program 1: //Outside the shader, set a shader attribute to negative offset. vertex_shader_attribute = -offset; ... //Then in the shader, set temp to the attribute. temp = vertex_shader_attribute; Program 2: //Outside the shader, set a shader attribute to the vertex x minus an offset vertex_shader_attribute = vertex.x - offset; ... //Then in the shader, set temp to attribute minus gl_Vertex x. temp = vertex_shader_attribute - gl_Vertex.x; The "temp" should be set to -offset in both cases, but I'm not seeing the same behavior in my app. The "temp" value is the only thing that changes between programs. Is gl_Vertex equal to the vertex passed into geom->setVertexArray()? Thanks, Mike
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