The short answer is yes, there are many ways to bring the time it takes to run a radiosity solution down. Radiosity requires that your modelling technique is adapted slightly, and that you take more care not to create objects that will bring Radiosity to its knees. When you have learned these techniques, you should be able to finish any radiosity solution in under an hour, most in about ten minutes. Just enough time to make some coffee!

In the tutorial section, we have an article which explains this subject in a lot of detail, please go there if you want to read more. Here, we will just list the main points you should watch out for.

  1. Avoid extruded circles or arcs, thick curved polylines and other rounded objects. Try to model these things with meshes or a series of straight lines. If you can’t make sure they don’t tessellate too finely (see question 3)
  2. Tag any objects that have small faces as "raytrace only." Commonly this includes furniture, detailed mesh objects such as cars and curved objects. Set the raytrace ambient setting to a value which makes these objects look the way you want them. (From the "Ambient Light" dialog, through the "Lighting" dialog under the main "Settings" tab)
  3. Tag any objects which are transparent as "Raytrace Only" and "Molding and Trim." Although radiosity will recognise transparent objects, they take up more time without this setting. This also has the advantage that glass actually appears transparent in the walkabout window.
  4. Avoid large differences in scale. A model that has both a huge 3dface for the ground surface and a tiny door handle detail will cause all sorts of problems for AccuRender. McNeel is currently researching this problem, and a fix should appear in a future build. (21 06 1999, current build is 223)

rev 06.5.01   ::   For more information visit www.accustudio.com

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