ImplicitCAD
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Negative extrude height leads to malformed output
The following extopenscad code:
linear_extrude(-5) square(5);
will lead to a cube where normal vectors of the top and bottom faces are pointing inwards instead of outwards. I believe this is caused by the extrusion algorithm falsely assuming that all extrusions will have positive heights and setting the normal vectors based on that.
hmm. now this doesn't work at all. :D