3D graphics programmers using Python?

[Brandon Van Every]

Bengt Richter wrote:
> On Wed, 05 Feb 2003 22:58:33 GMT, "Brandon Van Every"
> <vanevery at 3DProgrammer.com> wrote:
>
>> That means when you're trying to compute points on the
>> SphereTriangle, you end up having to use arccosines.
>>
> If you want great circle surface distance, I would have thought
> arcsine more likely.

That's merely an implementation detail of your formulation. If you are
determining your arc from a vertex and a point the opposite edge, their dot
product is the cosine, so you take the arccos.  If you were using a planar
normal representation of the triangle boundary, you'd use an arcsin.  Six of
one, half dozen of the other.  The point is, you have to use an inverse
trigonometric function.

--
Cheers,                         www.3DProgrammer.com
Brandon Van Every               Seattle, WA

20% of the world is real.
80% is gobbledygook we make up inside our own heads.