Jan Walzer <jan### [at] lzernet> wrote:
> If, and only if,
>     a)  A,B,C are forming a plane, and
>     b)  P lies in the plane

  Isn't a) implicitly true? Three points always define a plane.
  As for b), due to the limited accuracy of floating point numbers, it's
almost always false. However, I suppose that it suffices that P is close
enough to the plane.

  And I can believe that there could be a shortcut to see if a line
intersects a triangle. It's just too complicated for me to think being
this tired (and lazy) :)

-- 
#macro M(A,N,D,L)plane{-z,-9pigment{mandel L*9translate N color_map{[0rgb x]
[1rgb 9]}scale<D,D*3D>*1e3}rotate y*A*8}#end M(-3<1.206434.28623>70,7)M(
-1<.7438.1795>1,20)M(1<.77595.13699>30,20)M(3<.75923.07145>80,99)// - Warp -

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