> Dave Blandston wrote:
>
>> Or some other method?
>
> I wonder if the aoi pattern should be extended
> to support an absolute direction vector which is
> then compared to the incoming ray (ignoring the
> surface normal). Then the complete appearance of
> the sphere can change depending on the viewpoint
> (in particular it could become invisible).
>
> The current aoi pattern is not very helpful here
> as every viewpoint sees points on the sphere at all
> angles from 0 to 90 degrees.

In a way, the slope pattern does take a vector to determine an absolute 
direction against whitch the normal is evaluated. That vector can have 
any orientation. That coupled with an inside_texture that is totaly 
transparent...

Then, it should be possible to have a slope that contains an aoi pattern 
in a pattern_map.

It gets realy touchy if an object is to be invisible from more than one 
other reflective objects and those are not close to each other.



Alain

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