Le 07/12/2010 21:30, Christian Froeschlin a écrit :
> Le_Forgeron wrote:
> 
>> There is an issue inherent with such pattern: ulterior transformation
>> cannot affect the reference direction. which means that rotating an
>> object actually changes its appearance.
> 
> Yes, it's the same with the slope pattern. Also, the slope pattern
> supports both vector and point source in 3.7, so an alternate vector
> mode for aoi would not be completely unexpected
> 
>   aoi {relative_to <vector>}?
> 
> But I have no objections to "aov" as well.

I will wait for a few weeks before investigating further
(end of December is not computer-time friendly).

It seems there 4 vectors to consider, in pair:
 1. the ray direction
 2. the normal of the surface
 3. an absolute direction (from SDL)
 4. a direction from the intersection point to an absolute point

Some pairs are probably already covered by slope & aoi.
And maybe not all of the 6 combinations are interesting.

Post a reply to this message