"Orchid XP v2" <voi### [at] devnull> wrote in message 
news:44140c0e$1@news.povray.org...
> Arrrrghhh!! >_<
>
> It so *nearly* works it's driving me insane... It *almost* works, but it's 
> still broken!
>

Hi again,
Define 'works'. ;-)

You are passing a set of points and a set of references to those points to 
your routine (Similar to the way VRML defines shapes - maybe a coincidence).

Can I assume you were intending to get a closed 3D shape out of this?
If I understand your SDL and your intentions correctly you are happy with 
the edges, but you are not happy with the left-most surface when you set the 
first point to <-2,-1,-1>, because 3 of the points of the surface touch the 
corner points of the shape, but the fourth point (in this case the point 
with index 2, which is the 3rd one in your list) doesn't.

For each face, your SDL uses 2D components of 4 points to generate a flat 
prism object that lies parallel to the XZ plane, then you re-orient it based 
upon vectors defined using only the first 3 of the 4 points. Because the 
fourth point 3D that you pass into the routine doesn't lie on the same plane 
as the first 3 3D points you pass into the routine, your surface ends up 
sticking up in the air and doesn't stand a chance of touching the fourth 
point.

To move forward you will need to decide what sort of shape you would expect 
to generate for 4 points that don't lie in the same plane and generate that 
shape instead of the prism object (maybe a mesh or mesh2 object). Otherwise 
you may just wish to adjust your points so that each set of 4 points lies on 
a plane.

Regards,
Chris B.

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