Hi... I Currently have a problem with the glActiveTextureARB function. I have a VertexBuffer for my geometry and 2 Tex Coord buffers for Lightmap + Texture... Iam absolutely sure that the tex coords in my buffers are right. My problem is that if i want to use both in different Textures (TEXTURE0 and TEXTURE1 which is a must for Lightmapped Textured), one of them doesnt work ( looks completely wrong ) So I tried to draw one by one This does work: glActiveTextureARB(GL_TEXTURE0_ARB); glEnableClientState(GL_TEXTURE_COORD_ARRAY); glTexCoordPointer(2, GL_FLOAT, sizeof(CVector2), m_pTexCoords2); // m_pTexCoords2 is my Lightmap Texture Coordinate buffer glEnable(GL_TEXTURE_2D); glBindTexture(GL_TEXTURE_2D, m_Lightmaps[pFace->iLightmapID]); glActiveTextureARB(GL_TEXTURE1_ARB); glDisable(GL_TEXTURE_2D); glDrawArrays(...); However this doesnt work glActiveTextureARB(GL_TEXTURE1_ARB); glEnableClientState(GL_TEXTURE_COORD_ARRAY); glTexCoordPointer(2, GL_FLOAT, sizeof(CVector2), m_pTexCoords2); // m_pTexCoords2 is my Lightmap Texture Coordinate buffer glEnable(GL_TEXTURE_2D); glBindTexture(GL_TEXTURE_2D, m_Lightmaps[pFace->iLightmapID]); glActiveTextureARB(GL_TEXTURE0_ARB); glDisable(GL_TEXTURE_2D); glDrawArrays(...); I need to get it working for both Texture slots. Can anyone give me a hint whats wrong? Thanks

EnableClientState and TexCoordPointer require you to use glClientActiveTexture.

Hmm whats the difference between glActiveTextureARB and glClientActiveTextureARB?

Thanks alot! It works now

Oh.. and FYI ( I figured this out the hard way ), don''t enable arrayPointers that you don''t use. If you do, when you try to use glDrawArrays or simular functions, the program will crash.