I've been experimenting with the file Spiral_poly8.

At first I tried different values for C in the poly 8. The mathematical 
derivation gives a zero, but then there is a line along the y-axis visible.
In the past I had to put a very small value in it to prevent sudden
system break downs. That's not the case anymore, but a bit bigger
value, such as 0.0001, makes the central line disappear. In fact 
there is a growing cilinder along the y-axis, if C gets bigger, that 
wipe out any surface there. You can see that if you choose the 
Minor_X_Radius almost as big as the Major_Radius. 
If you choose the Minor_X_Radius greater then the Major_Radius,
it still renders, but values smaller then zero are not possible, so
there are no intersecting surfaces.

To see the form of the spiral I toke a look from a greater distance,
but to see it better I narrowed the angle of view. Le_Forgeron was
speaking of noice in its picture with the poly16 file. I wonder
if this is the same effect. If rendered with three different viewing
angles and adjusted the z-distance to compensate for the greater 
pictures, because it actually acts like zooming in if you lower the
viewing angle of the camera. You can see the results in the 
pictures. At 'normal' distance nothing to see, but the further 
away you go, the more noise there is. I'm puzzled here. How
can this influence the poly-solver, for obviously it does.

Maybe this helps finding a solution for the noise.

Jaap Frank

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