The given script screw.tcl creates a triangle helix. If I draw primitives seperate, I get the content of ScrewThreadError.png,
if I draw them connected as region or combination, I get ScrewThreadCorrect.png.
In ScrewThreadError some seemingly random ARB8 are omitted.
Rotating does not solve, but changes the effect (different missing pieces).
This happens in MGED embedded rt, in rt and rtedge.
Detailed description is included (Plattform, How to reproduce, Script, Pictures)
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