On Thu, 27 Aug 1998 14:45:25 GMT, hey### [at] omabe <hey### [at] omabe> wrote:
>thanks for the comments but the problem remains unsolved:
...
>2. I did not use any spheres or other closed objects; just 2
>heigthfields. so, I am not inside an hollow object.

(By the way, please don't post binaries in this group.  That's why there are
binaries groups.)

You can be inside a heightfield, as well.  If your sky heightfield isn't 
"upside-down" you will be inside of it.  Basically, the "inside" of an 
untransformed heightfield is everything with a y value below the level of 
the surface and with 0<=x<=1 and 0<=z<=1.  Yes, everything - heightfields 
are infinite objects, despite the fact that they are documented in the 
"finite solid primitives" section of the manual.

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