HowTo Talk:Use radiosity

A description of the parameters might be a documentation sort of thing, but seeing what changes to parameters do is sort of a How To thing...

I am working on a few demonstration scenes for the following:

1. a scene demonstrating when radiosity could be used to improve realism.
   • When I was new to POV, I didn't know when to use radiosity, and I think different examples showing the difference between using the ambient light for global illumination and radiosity would be helpful in making such a determination.
2. Using radiosity with lightsources
3. Using radiosity without lightsources (glowing object method)
4. Effects ok sky_sphere or background on radiosity
5. possibly a 10 x 10 grid of images with parameter changes (and render times) to demonstrate some of the main speed/quality ratios.
6. ???

Input would be appreciated! --Reactor 22:32, 27 December 2007 (UTC)

It makes sense to cover the typical problems and artifacts that people run into, and how to avoid those pitfalls.
Maybe something like a Cornell box for a test scene?
TimA 23:34, 27 December 2007 (UTC)

In response:The Cornell box is a pretty good one, but I think we should have several examples, especially different types. The Cornell Box is an indoor scene with all objects very close together. The one I envisioned for an example of when to apply radiosity is a simple outdoor architectural scene that includes both wide areas, smaller objects, and light reflected off of walls farther away.

Included are two images side by side that I think would be helpful to those new to POV in deciding when there scene would benefit from radiosity:

• 

  Without Radiosity

• 

  With Radiosity

The Cornell Box in various forms would be very good for indoor examples, but I think variations of a scene similar to this would be helpful for outdoor examples, especially because a new user may not be aware that the sky_sphere can influence radiosity.

--Reactor

Split into more than one article?

Most of the things I've added under tuning radiosity focus on use of light sources and the background for scene lighting. The use of objects with high ambient values is essentially similar, but it really has its own set of issues that need to be addressed. Then there is using a combination of both, which requires a good understanding of when to raise the brightness in a radiosity block, and when to increase light intensity or ambient values.

In short, I'm thinking that this article could be split into at least 3 or 4 articles:

• Basics about radiosity
• Radiosity Using light_sources
• Radiosity Without light_sources
• Advanced Radiosity (using light_sources, bright objects, light groups, etc)
• Speeding up and Troubleshooting Radiosity

Or something.

--Reactor 05:57, 13 January 2008 (UTC)