Takuya Arai <tim### [at] stratosnet> wrote:
: Ah ha.  So it does handle it like a solid 3D object then.

  Well, yes and no.
  Povray handles objects as if they were solid for: a) refraction, and
b) fog/media.
  For anything else objects are just surfaces (for example when texturing).

  Note that the keyword 'hollow' doesn't affect refraction in any way. It's
just a fog/media related thing.

:  Okay, that's 
: cool...and I assume it works just the same even if you're using bicubic 
: patches too then right?

  A surface is a surface. The same rule applies to all of them. Ray hits
it -> we are inside; ray hits it again -> we are outside.
  This of course causes problems when the surface is not closed...

  Note that bicubic patches and triangle meshes work ok in refraction, but
not in CSG.

: I knew that, but I wasn't sure if it would consider the inside of an object as 
: a hollow space.

  There is only hollow space inside the objects. To see it, move the camera
inside them.
  They might look like solid when refracting, but they aren't really.

-- 
main(i,_){for(_?--i,main(i+2,"FhhQHFIJD|FQTITFN]zRFHhhTBFHhhTBFysdB"[i]
):5;i&&_>1;printf("%s",_-70?_&1?"[]":" ":(_=0,"\n")),_/=2);} /*- Warp -*/

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