320x240: POV-Ray traces a few lines then it crashes.
400x300 and higher: POV-Ray stops to trace when it reaches the iso, but
doesn't crash. The only thing I can do is to close POV.
Antialiasing did not have any effect in my tests.
Declaring any function makes it work, but only if it comes before the iso.
POV-Ray v3.5 b8 Windows Me Athlon
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Jonathan.