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madu

specular not working in LH

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I am trying to transform OpenGL from a right-handed coordinate system into a left-handed coordinate system like in DirectX. So I reversed the signs in the perspective matrix for z and w, and reversed the order in which vertices are passed. This seems to work, lighting works as normal, but the specular light doesn''t. What am I doing wrong?

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Are your polys textured? if so you need to add the line

glLightModeli(GL_LIGHT_MODEL_COLOR_CONTROL, GL_SEPARATE_SPECULAR_COLOR);

Otherwise the texture hides the specular highlight. If (as in Microsoft GL) these symbolic constants are undefined you can define them thus:


#ifndef SEPARATE_SPECULAR_COLOR
#define GL_SEPARATE_SPECULAR_COLOR 0x81FA
#endif

#ifndef GL_LIGHT_MODEL_COLOR_CONTROL
#define GL_LIGHT_MODEL_COLOR_CONTROL 0x81F8
#endif

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