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SolidCode / SolidPython

A python frontend for solid modelling that compiles to OpenSCAD
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Collision detection #164

Closed kaolpr closed 3 years ago

kaolpr commented 3 years ago

Do you have any handy method for detecting collision between bodies? I am thinking of a method for verification if elements of the assembly do not overlap.

etjones commented 3 years ago

Unfortunately, OpenSCAD (and therefore SolidPython) has no capacity at all for introspection, meaning there’s no automated way to test for object intersection besides running OpenSCAD / CGAL and checking where your objects end up.

This is a pretty fundamental limit on the program. When people ask about capabilities like this, I usually tell them they’ve outgrown OpenSCAD and point them to commercial CAD packages. One free place you might look is at Christopher Olaf’s ImplicitCAD (https://github.com/colah/ImplicitCAD). Its 3D kernel is based on very different algorithms than OpenSCAD/CGAL which can be a) much much faster than OpenSCAD, and b) more tightly integrated into the language, so there’s some possibility of introspectability. Give it a look!

On Feb 20, 2021, at 10:17 AM, Mikołaj Sowiński notifications@github.com wrote:

 Do you have any handy method for detecting collision between bodies? I am thinking of a method for verification if elements of the assembly do not overlap.

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kaolpr commented 3 years ago

@etjones Thank you for explanation. I'm also looking into CadQuery (https://github.com/CadQuery/cadquery), but have not yet established if what I need is possible there.