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Parametric solid construction apps:
PLaSM
ImplicitCAD
— has much fewer limitations on precision, compared to OpenSCAD
it operates on
functions
,
not triangles
in general, it should be good at avoiding
non-manifold objects
[2]
based on
CGAL
OpenSCAD
based on
OpenCascade
Parametric Parts > CAD Query
CScheme
SchemeCad
Generative Modelling Language
FreeCAD