OpenGL’sSphere Map Mode

OpenGL will do sphere mapping work



• Configure OpenGL texgen like this

glTexGeni(GL_S, GL_TEXTURE_GEN_MODE, GL_SPHERE_MAP); glTexGeni(GL_T, GL_TEXTURE_GEN_MODE, GL_SPHERE_MAP); glEnable(GL_TEXTURE_GEN_S); glEnable(GL_TEXTURE_GEN_T); glEnable(GL_TEXTURE_2D);

• Then, render polygons specifying object and normal coordinates like this

glNormal3f(nx, ny, nz); glVertex3f(x, y, z);

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