objects made with for loops show in preview, but won't render

hey folks,

i'm placing .stls in a specific order (using a for loop) and while they show
up in preview, they don't show up in the render, and it occasionally bounces
back warnings like "UI-WARNING: Object may not be a valid 2-manifold and may
need repair!"

my first thought was that my .stl is broken, but i'm actually placing the
same .stl outside of a loop, and that one shows up fine.

here's a snapshot of the code:
<http://forum.openscad.org/file/t2636/openscadCode.png>

preview:
<http://forum.openscad.org/file/t2636/cukeSlice1.png>

render:
<http://forum.openscad.org/file/t2636/cukeSlice2.png>

does anyone know what's wrong? i'm worried it has to do with my function
math but i don't know enough about how that math is processed to
troubleshoot further. any help would be super appreciated.



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Try:

import("cuke.stl");
cube(1);

If you just have one object it doesn't call CGAL, the cube() forces a
union(), I suspect the stl is bad, uploaded it here and I'll have a look.



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here's the .stl:
cuke.stl <http://forum.openscad.org/file/t2636/cuke.stl>  

i tried cube(1), interestingly this made it stop rendering any of the
objects?

if it's ok, can i ask why cgal isn't called for one object? i know what cgal
is, technically, but i'm not super familiar with how it works



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oh ok cool, thanks! i'll look into fixing the .stl, super appreciate the
quick responses

edit: fixing the .stl worked, thanks again



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onion wrote
Yeh, didn't look good:
<http://forum.openscad.org/file/t359/onion_cuke.jpg>

Purple = duplicate triangles, red=self-intersections



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