Jan Walzer wrote:
> 1)
> the points of a regular tetraedron can have the following coordinates
>
> #declare h=sqrt(3/4);
> #declare p1=<   0,-1/3*h, 2/3>;
> #declare p2=< 1/2,-1/3*h,-1/3>;
> #declare p3=<-1/2,-1/3*h,-1/3>;
> #declare p4=<   0, 2/3*h,   0>;

p1, p2 and p3 are not the vertixes of an equilateral triangle. They are the
vertixes of an isosceles triangle with base = 1 and height =1.

--
Jonathan.

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