planiform wrote:
>Hello all.  This is my first post.  Hope I'm following protocol.
>
>Below is code I wrote for the difference between a helix isosurface and a
>box.  As you can see the box is removing the section of helix but leaving
>an artifact.  Can anyone explain how to fix this?  Thanks in advance.

In the documentation on Isosurface objects, it specifically mentions your
problem.  It is related to performing CSG operations on isosurfaces.  Check
out the following link and look for max_trace and all_intersections.

http://www.povray.org/documentation/view/169/

Bill

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