kurtz le pirate <kur### [at] gmailcom> wrote:

> yes, translate, but POVRay say :
> -10.591118 + 3.000000 = -7.591118
>
> and "225012156" wrote that z is equal to -7.656250
> so a gap of 0.065132.
>
> another subtlety ?

There are two vertices with z = -10.591118
and one with z = -10.833504


#declare base_02 = mesh2 {
vertex_vectors {
3
<2.952163, 3.632734, -10.591118>,
<1.556791, 3.632964, -10.593109>,
<2.93827, 3.516272, -10.833504>,
}


So it's not completely vertical, which means the intersection point will be
farther back than -10.591118.  The z coordinate of the centroid of the
translated triangle lies at  -7.67195467, but maybe it's intersecting at one of
the other triangle centers.

- BE

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