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POLighting issues in OpenGL
 

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    <p>I have a triangle mesh that has no texture, but a set color ( sort of blue ) and alpha ( 0.7f ). This mesh is run time generated and the normals are correct. I find that with lighting on, the color of my object changes as it moves around the level. Also, the lighting doesn't look right. When i draw this object, this is the code:</p> <pre><code>glEnable( GL_COLOR_MATERIAL ); float matColor[] = { cur-&gt;GetRed(), cur-&gt;GetGreen(), cur-&gt;GetBlue(), cur-&gt;GetAlpha() }; float white[] = { 0.3f, 0.3f, 0.3f, 1.0f }; glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, matColor); glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, white); </code></pre> <p>Another odd thing i noticed is that the lighting fails when i disable GL_FRONT_AND_BACK and use just GL_FRONT or GL_BACK. Here is my lighting set up ( done once at beginning of renderer ):</p> <pre><code>m_lightAmbient[] = { 0.2f, 0.2f, 0.2f, 1.0f }; m_lightSpecular[] = { 1.0f, 1.0f, 1.0f, 1.0f }; m_lightPosition[] = { 0.0f, 1200.0f, 0.0f, 1.0f }; glLightfv(GL_LIGHT0, GL_AMBIENT, m_lightAmbient); glLightfv(GL_LIGHT0, GL_SPECULAR, m_lightSpecular); glLightfv(GL_LIGHT0, GL_POSITION, m_lightPosition); </code></pre> <p>EDIT: I've done a lot to make the normals "more" correct ( since i'm generating the surface myself ), but the objects color still changes depending where it is. Why is this? Does openGL have some special environment blending i don't know about? EDIT: Turns out the color changing was because a previous texture was on the texture stack, and even though it wasn't being drawn, glMaterialfv was blending with it.</p>
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