Hello,

I was trying to make a Customizer for Thingiverse.  I couldn't import STL
files on Customizer, so I made a C++ program to convert STL files to
polyhedron()s.  However, my renderer gives me errors whenever I try to show
two polyhedrons()s in the same file.

If you look at the file I uploaded, you will see there are two modules with
polyhedrons in them, both of which are called.  If you call only one of
them, it renders as it should.  But if you try to render both of them, it
renders nothing.  How do I render them both at once?

In the meantime,  I decided to throw everything into one polyhedron()
https://www.thingiverse.com/thing:4422840  , with variables to control
placement and size and all that.  I had my C++ program assist me in this
though, as I don't have the skill to do it entirely by hand

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Can you render at your computer the import of the two stl ?
If no, that is the problem. If yes, your conversion code may have a bug.

Okay.  I am typing this from my phone.  As soon as I am back at my computer,
I will try to make two simple polyhedron() cubes (manually and from STL
conversion), and render them side by side.  Also trying two manual cubes,
two cubes converted from STL, and one of each.  My models do pass inspection
in the thrown together view (yellow always faces out).

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Oh, and some clarification.  I am new to OpenSCAD, and do not understand what
can cause CGAL errors.

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CGAL errors are usually a bad STL (non manifold and/or self intersections -
google these terms) or similarly badly formed polygon/polyhedron.

You will generally NOT get a CGAL error if you render one object, because
CGAL gets called to union() defference() etc.

A good test is to add cube(1); to the object you have issues with, that
forces a union() so CGAL gets called.

Admin - email* me if you need anything,  or if I've done something stupid...

• click on my MichaelAtOz label, there is a link to email me.

Unless specifically shown otherwise above, my contribution is in the Public Domain; to the extent possible under law, I have waived all copyright and related or neighbouring rights to this work. Obviously inclusion of works of previous authors is not included in the above.

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