"Amir_ni"  wrote in message
<web.498adf1b1f5de9ab792c7d270@news.povray.org>:
> Hi friends, I wanna make a solid tetrahedron using 4 triangles. I am using the
> following code, but the object's inside is empty (I noticed it, when I used
> difference command to subtract 4 spheres from the tetrahedron.

I am pretty sure the "correct" way to do a tetrahedron is the intersection
of four planes (which, fortunately, are actually half-spaces; otherwise, the
previous sentence would be mathematically stupid).

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