> There is a construction problem as well as coincident surfaces that
> cause some additional problems.
>
> Changing the difference to an union.
> Giving distinct colour to each component...
> Pull back the camera to -9*z
> Adding a colour value to the light_source
> and we get:
>
> A smaller green box, a large red and a large blue box.
> Most of the green box is inside the others.
> The red and blue overlap.
> The red and blue boxes have coincident surfaces. This can throw
> insideness tests off.
>
> The problem is NOT version dependent, version 3.6 or 3.5 should render
> similarly.
>
>
> Alain

After several tests I just find that the problem actually is the same in 3.6 and
3.7, the code I tested in 3.6 was a different one. So the problem is NOT version
dependent.

I guess will be better to use Blender or other software. I can not continue
searching for holes or other issues in my model.

Best regards.

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