Am 01.08.2010 15:16, schrieb Dave!:
> Haven't posted here in ages--please be gentle!
>
>
> I'm trying to wrap a simple image onto the surface of a cylinder.  For various
> reasons, I don't want to use image mapping and was hoping to do it with
> intersecting solids.
>
> The image is a sort of caution sign, an upright yellow triangle with a black
> boarder and a black exclamation point inside.
>
> I can create a flat version image very easily using a few triangle meshes and
> disc objects, but I'm having trouble getting it to intersect with the cylider's
> surface.
>
> Does this make sense?  My gut feeling is that POV-Ray offers some dirt-simple
> way to do this, but I have the impression that I'm missing something basic.

No surprise you have trouble intersecting your sign with the cylinder 
surface: You mention triangle meshes and disc objects; neither of these 
have any depth, so you can't intersect them with anything.

You need to give the sign a third dimension: Use cylinders instead of 
the disks, and linear_spline prisms instead of the triangle meshes. That 
should get you started.

Note that if you want the sign to cover a big portion of the cylinder, 
you may also run into problems with distortions. In that case, you might 
need to use a set of object patterns and apply a cylindrical warp.

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