In article <8ei### [at] tritonimagicode>,
 Christoph Hormann <chr### [at] gmxde> wrote:

> I feared something like that.  But in many cases where the crackle 
> pattern is nice to use only a relatively small area of the pattern space 
> is actually evaluated.  In these cases i could imagine a system like this:
> 
> - initially build a BSP tree for all points within a certain area 
> (possibly customizable with a parameter).

It would have to be customizeable with a parameter...POV has no way of 
determining where you are going to use the pattern.


> - when a point outside this area is evaluated use the old technique.

This much could be done with the Voronoi patch. Just use an object 
pattern with a box, the voronoi pattern with appropriately placed points 
inside the box, and the crackle pattern outside it. Computing the right 
points to get a smooth transition would be tricky though...a couple 
extra functions such as hash3d() would make it easier.


> - when a certain number of points outside needed to be evaluated rebuild 
> the BSP tree for a different/larger area.

This would require actual patch work. Figuring out how big the cache has 
to be to make it worth having, when to rebuild it, etc...an interesting 
problem.

-- 
Christopher James Huff <cja### [at] earthlinknet>
http://home.earthlink.net/~cjameshuff/
POV-Ray TAG: <chr### [at] tagpovrayorg>
http://tag.povray.org/

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