Hi! How can I use a multiply-effect in OpenGL. Textures should get multiplied. The texture is over another texture and shoulg get multiplied. How?

multi-texturing where the second texture units blend mode is set to GL_MODULATE, ie,
glTexEnvi(GL_TEXTURE_ENV,GL_TEXTURE_ENV_MODE,GL_MODULATE);

or simply use two passes, with the blend mode as glBlendFunc(GL_ZERO,GL_SRC_COLOUR); for the second pass

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[edited by - RipTorn on January 18, 2003 6:42:58 AM]