Sphere mapping, a.k.a. reflection mapping or environment mapping, is a texgen mode that simulates a reflective surface.
It is enabled by setting the texgen mode to GL_SPHERE_MAP.
There are no additional parameters.
glTexGeni(GL_S, GL_TEXTURE_GEN_MODE, GL_SPHERE_MAP) glTexGeni(GL_T, GL_TEXTURE_GEN_MODE, GL_SPHERE_MAP)
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