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glTexGeni

Started by circuit Apr 11, 2002 at 12:13 PM 0 replies 2.3k views

Original Post

Apr 11, 2002 at 12:13 PM

What is the difference between GLfloat sPlane[4] = {1.0, 0.0, 0.0, 0.0}; GLfloat tPlane[4] = {0.0, 0.0, 1.0, 0.0}; glTexGeni(GL_S, GL_TEXTURE_GEN_MODE, GL_EYE_LINEAR); glTexGeni(GL_T, GL_TEXTURE_GEN_MODE, GL_EYE_LINEAR); glTexGenfv(GL_S, GL_EYE_PLANE, sPlane); glTexGenfv(GL_T, GL_EYE_PLANE, tPlane); glEnable(GL_TEXTURE_GEN_S); glEnable(GL_TEXTURE_GEN_T); glEnable(GL_TEXTURE_2D); and GLfloat sPlane[4] = {1.0, 0.0, 0.0, 0.0}; GLfloat tPlane[4] = {0.0, 0.0, 1.0, 0.0}; glTexGeni(GL_S, GL_TEXTURE_GEN_MODE, GL_OBJECT_LINEAR); glTexGeni(GL_T, GL_TEXTURE_GEN_MODE, GL_OBJECT_LINEAR); glTexGenfv(GL_S, GL_OBJECT_PLANE, sPlane); glTexGenfv(GL_T, GL_OBJECT_PLANE, tPlane); glEnable(GL_TEXTURE_GEN_S); glEnable(GL_TEXTURE_GEN_T); glEnable(GL_TEXTURE_2D); . They both seem produce EXACTLY the same effect, no matter how I translate or rotate my objects.

hooded_paladin

Apr 11, 2002 at 1:34 PM

EYE_LINEAR makes texture coordinates based on where the point is on the screen... when you look at the object, the model looks 3d but the texturing is 2d. Hard to explain, it''s as if the texture is a background and all you can see of it is the shape. OBJECT_LINEAR maps the texture directly to the object, and stays in place when the object is rotated. This is an easy way to apply some texture to the object quickly, but looks fake if the users can move around the object much. I don''t know why you get the same results...

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