POV-Ray : Newsgroups : povray.general : question concerning area lights, reflection blur et cetera... : Re: question concerning area lights, reflection blur et cetera... Server Time
7 Aug 2024 23:22:57 EDT (-0400)
  Re: question concerning area lights, reflection blur et cetera...  
From: Nathan Kopp
Date: 24 Apr 2001 22:42:31
Message: <3ae63997$1@news.povray.org>
"JRG" <jrg### [at] hotmailcom> wrote...
>
> "Warp" wrote
> >   This might be possible with a slightly modified version of photon
> mapping...
> Lightflow supports this type of lights, ergo it would be possible to
> implement in an unofficial version of POV.
> Here's the quote from Lightflow's documentation:
> "Soft light [...]
> It simulates soft shadows using a simple zbuffering technique, and so it
is
> much faster than real area lights, even if it produces similar results.

I read a paper about a technique that would do this.  (probably the same
algorithm that lightflow uses.) There was even a discussion on one of these
groups.  The problem is that it only works with tesselated (all
triangle/polygon) scenes, because it works by doing an intersection test
with an 'expanded' version of the object, where each individual triangle is
scaled larger.  This technique only works with convex objects, not with
concave objects.  It works with triangle meshes because the mesh can be
treated as a collection of convex objects, and each one is scaled
individually.  You currently can't do that with all POV scenes.

-Nathan


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