mirror of https://github.com/vitalif/openscad
Added note about the hollow donut problem
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@ -166,6 +166,14 @@ o Grammar
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- A random(seed) function
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- import_*() -> *_import() (consistent prefix vs. postfix)
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- linear_extrude()/rotate_extrude(): Cumbersome names? -> (extrude, revolve, lathe, sweep ?)
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o Hollow donut problem
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When extruding a 2D CSG tree (e.g. a polygon with a hole), the hole
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information is lost when performing the extrusion. For linear
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extrusions, this has only a minor visual impact, but for rotate
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extrusion, the resulting CGAL models will lose the hole. The OpenCSG
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rendering keeps the hole, but renders slightly incorrect.
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CODE
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