MVSmith wrote:
> In an earlier posting (on 20040121), I requested info on "scanning"
> unions and differences of objects to read off height-field data from the
> composite structure and thence out to a text file. A day or two after this
> I discovered the isect() function, which seems to do the trick.

I don't know such a function, neither in POV-SDL syntax nor in the 
POV-Ray source code.

> Except....that when the vector you're using to intersect with the intended
> surface strikes the junction between two objects in this composite
> structure,
> sometimes it shoots through the seam and intersects the surface on the
> opposite
> side.
> 
> Here's a test case.
> Create a cube 4 units on a side, centered at the origin.
> Create a sphere of radius 1, offset 2 units along the +y axis.
> Create an object that is the difference between these--what you get is
> a cube with a hemispherical "basin" of radius 1. The composite object
> is centered on the y axis.
> 
> [...]

It would probably be much easier if you just post a minimal test scene 
to reproduce your problem.

Christoph

-- 
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Last updated 11 Jan. 2004 _____./\/^>_*_<^\/\.______

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