[ODE] Ray normals

[james at 6msoft.com]

> James,
>
> I was having the same problems as you with the ray normals. You said you
> managed to fix the problem. What was it that you were doing wrong?
> (because I am doing the same thing).
>
> Thanks for the reply, :)
>
> Panayoti
>
>
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Interesting, because it seems it was my code that was breaking the
normals. Anyhow, I imagine the problem you are having is the normals are
backwards, which is because they do a left-hand rule cross product to find
them, so easy fix for you may just to be scale the normal by -1 when you
get it.

-James