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On Wed, 13 Feb 2002 16:22:33 -0500, Timothy R. Cook wrote:
> Ron Parker wrote:
>> If we knew where the surfaces were, we wouldn't need to trace rays
>> at all. As it turns out, we don't know where they are.
>
> But they're defined by mathematical formulae. You know (or can find
> out) exactly where the surface is by solving for the formula.
Not in every case. Some things have to be approximated, which is a messy
and expensive task. Examples include the poly object for higher-order
polynomials, the isosurface object, and lots of others.
--
#macro R(P)z+_(P)_(P)_(P+1)_(P+1)+z#end#macro Q(C,T)bicubic_patch{type 1u_steps
6v_steps 6R(1)R(3)R(5)R(7)pigment{rgb z}}#end#macro _(Y)#local X=asc(substr(C,Y
,1))-65;<T+mod(X,4)div(X,4)9>-2#end#macro O(T)Q("ABEFUQWS",T)Q("WSXTLOJN",T)#
end O(0)O(3)Q("JNKLCGCD",0)light_source{x 1}// ron### [at] povrayorg
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