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From what I can tell so far you are simply getting the boxes cutting all
the way though the screw head. Nothing about the 'clipped_by' that I can
see (yet).
Although, just to add a possibly relevant fact, I once had a very
stubborn CSG object using clipped_by to open the object for use as two
halves (duplicated clipped_by on each half) and previously invisible
parts were then made visible. And only because of the clipped_by near as
I could tell.
I may be back if there's more to this one here, however, as I said, all
I see is the unioned boxes are set too low, or rather, the cylinder
sphere union is not deep enough.
Rainer Mager wrote:
>
> Hi all,
>
> Can anyone tell me if this is a bug or correct behavior? I've trying to
> make a CSG shape and I have a clipped_by statement withing a union (so it
> should only affect that union, right). I also have that union differenced
> from another union.
> What I am seeing, however, is that the clipped by is affecting the
> entire shape, not just the local union. Any ideas? Oh, this is on POVRay
> 3.1e.
> What I'm trying to accomplish is that I don't want the hole going all
> the way through the screw. It should stop 0.1 above the bottom.
>
> Here's a code snippet:
>
> #declare Screw = difference {
> union {
> cylinder {
> <0, 0, 0>, <0, 0.1, 0>, 0.5
> }
> sphere {
> <0, 0, 0>, 0.5
> scale <1, 0.5, 1>
> translate <0, 0.1, 0>
> }
> }
> union {
> box {
> <-0.1, -0.5, -0.5>, <0.1, 0.5, 0.5>
> rotate x*45
> translate <0, 0.5, 0>
> }
> box {
> <-0.1, -0.5, -0.5>, <0.1, 0.5, 0.5>
> rotate x*45
> rotate y*90
> translate <0, 0.5, 0>
> }
> clipped_by {
> plane {
> y, 0.1
> }
> }
> }
> }
>
> Thanks,
>
> --Rainer
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