polygon normals and spherical co-ordinate systems
- From: tektoy <no@xxxxxxxxxxxx>
- Date: Tue, 20 Sep 2005 23:34:07 -0700
Just wondering why while most math books / courses (and internet math
sites) seem to give the obligatory references to polar, spherical as
well as cartesian co-ordinate systems.
But when I get to computer graphics texts or usage it seems to me
vector normals are the norm and polar/ spherical usage is rare or
simply never mentioned.
Yet it seems to my (admittedly limited) understanding that for some
applications, ie a simple 3d object viewing, where all we ever do is
rotate a model, describing polygon normals with a spherical system
would mean that things like rotation, back face culling and shading
would be quicker and easier to do, than doing the same using vector
math.
Am I missing something important here?, or is spherical co-ordinate
usage simply come to (mathmaticly speaking) an evolutionary dead end?
Regards.
.
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