> Now the beauty of the thing is, that when you rotate a body, > you rotate the normal vectors as well. When you translate > or scale, you translate and scale the vertices, but not > the normals. Now these "Whew!" guys transform the normals, > always.
If you scale the body anisotropically, you *have* to transform the normals, otherwise they wouldn't be normal anymore. (And you have to transform them differently from how you transform the vertices, that's what they're saying. Think covariant and contravariant vectors.) _______________________________________________ Groff mailing list [email protected] http://lists.gnu.org/mailman/listinfo/groff
