RE: [Algorithms] [Rendering] Merging, approximating several dynamic lights

[Tom F. <tom...@bl...>]

One normal and an ambient == a 4-component spherical harmonic! (I can
never remember if that's 1st order or 2nd order). The increase in
quality in going to a 9-component one is IMHO significant.

TomF.


> -----Original Message-----
> From: gda...@li... 
> [mailto:gda...@li...] On 
> Behalf Of Troy Gilbert
> Sent: 21 July 2003 17:01
> To: 'gda...@li...'
> Subject: RE: [Algorithms] [Rendering] Merging, approximating 
> several dynamic lights
> 
> 
> Don't know about others, but I'd be interested in hearing 
> what technique
> you're using to merge all dynamic lights into one ambient and one
> directional. In general, are there any papers relating to generically
> "factoring down" dynamic lights in the same way there are so many mesh
> reductions algorithms?
> 
> Troy
> Developer Relations
> Criterion Software
> www.csl.com
> 
> 
> > -----Original Message-----
> > From: Alen Ladavac [mailto:ale...@cr...]
> > Sent: Tuesday, July 15, 2003 1:10 PM
> > To: gda...@li...
> > Subject: Re: [Algorithms] [Rendering] Merging, approximating several
> > dynamic lights
> > 
> > 
> > Hm, we've used a method for aproximating any number of 
> > point(local), directional(inifinite) and
> > ambient lights into one ambient and one directional. The 
> > object could be 0-100% in shadow wrt any
> > light, and transitions were always smooth. The idea was 
> > simple and straightforward, but I am not
> > sure if that is what you want, as it was all for per-vertex 
> lighting.
> > Is your problem in creating a smooth aproximation to for 
> > vertex lighting, or a smooth change between
> > per-pixel and vertex lighting?
> > 
> > Alen