[OpenSCAD] Getting more information

Dan Shriver tabbydan at gmail.com
Thu Jul 4 11:19:43 EDT 2019

Thanks for the tips!

I'm not sure I understand "It could be a degenerate case, in which case you
can solve the problem by replacing every occurrence of [a:b] in your code
with [a:1:b]"

I thought the way loops worked in openscad was [start:increment:end] or if
two arguments were used they were assumed to be only start and end and
increment was assumed to be 1.
I will try your suggestion but don't understand why it would sometimes be a
problem and sometimes not.  I'd like to understand it since it would give
me a better picture how to use OpenSCAD.  When you say "degenerate" do you
mean in the case start = end; or do you mean the interpreter sometimes
screws up and interprets two arguments as [start:increment] and gives end
some weird garbage value?

On Thu, Jul 4, 2019 at 11:03 AM adrianv <avm4 at cornell.edu> wrote:

> DanS wrote
> > I'm still trying to debug my own code but am frustrated in that I can't
> > see
> > where the problem exists.  I get some errors and other messages from
> > OpenScad but unfortunately they don't point to what it was in my code
> that
> > triggered it:
> >
> > ERROR: CGAL error in CGAL_Nef_polyhedron3(): CGAL ERROR: assertion
> > violation! Expr: e_below != SHalfedge_handle() File:
> >
> /opt/mxe/usr/x86_64-w64-mingw32.static.posix/include/CGAL/Nef_3/SNC_FM_decorator.h
> > Line: 426
> I don't recognize this error specifically, but typically if you get errors
> relating to polyhedra it means you have constructed an invalid polyhedron
> with the polyhedron module.  You can select View->Thrown Together in
> preview
> which will show reversed faces.  But otherwise you just have to work
> through
> your construction.
> > Likewise, I sometimes get this warning:
> >
> >
> > DEPRECATED: Using ranges of the form [begin:end] with begin value greater
> > than the end value is deprecated.
> Yeah, this one is extremely annoying.  There appears to be no way to get
> OpenSCAD to give you more information about this.  It can be anywhere in
> your code, or anything that you include.  It could be a degenerate case, in
> which case you can solve the problem by replacing every occurrence of [a:b]
> in your code with [a:1:b].  But if it's a mistake in your code, that will
> just cause the loop to not run---it won't tell you where the problem is.
> --
> Sent from: http://forum.openscad.org/
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> Discuss at lists.openscad.org
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