Ron Parker wrote:
> 
> On Thu, 16 Sep 1999 17:00:31 +0200, Tomas Plachetka wrote:
> >i wonder why is mosaic preview for "radiosity" important.
> 
> Because the radiosity calculations require a well-distributed
> set of sample points.  Mosaic preview goes over the entire scene,
> so the points that are created as it samples the coarser grid
> approximate the ones that will be needed when it computes at the
> finer resolution.

thanks for your quick reply. yes, you are right (when 
looking around here i see you always are  :-)

however, i'm more interested in what would happen if the
mosaic preview were not used. would the radiosity code
still work? would it just run slower? would the quality 
of the rendering suffer?

my questions concern the screen parallelisation of pov-ray. 
making the "radiosity" code work in parallel is imho a 
nontrivial task. mosaic preview is just one of the problems 
i'm aware of, there are more difficult ones. pvmpov seems 
not to care about them. (each of the slave processes builds 
its own "radiosity" octree; the octrees are never merged and 
could not be saved; etc. i'm not sure whether the slaves do 
the mosaic preview on their chunks or not - i can only see 
the pvmpov patch file now, which is a little inconvenient to 
read.)

	y.

p.s.happy birthday!

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