Window & Door heads rending oddly in radiosity

[billtheia]

Can anyone out there tell me why the door and window heads of my model render in a different color than the walls that they are a part of when rendering in radiosity?

See attached image.

[M.CH]

It looks like that happens in fast radiosity, if you go to custom or final it renders correctly.

Interestingly when there is no floor extending beyond the walls this does not happen!!

[billtheia]

So is this a known bug? Is VW working on a fix for this?

[Dave Donley]

Hello billtheia:

It looks like the triangulation for the house is extremely coarse with Fast Radiosity. Custom Radiosity would allow more triangles and more accuracy. Otherwise send me the file and I can look into it.

Some of the vertices are likely inside the roof or the floor and that is why they aren't lit. These are called shadow leaks.

Edited June 17, 2008 by Dave Donley

[billtheia]

Just sent it.

Thanks for taking a look.

[Dave Donley]

Hello again Bill:

Try this instead of using Custom Radiosity and increasing the values in there.

Custom RenderWorks Options

Enable Final Gather in the Final Gather pane

Set size to 1'

Set Accuracy to 10%

Go to Render pane, enable Auto Exposure

Set Brightness to 180%

Render with Custom RW mode.

That should work faster and have less annoying artifacts than using Fast Radiosity. Radiosity will look better with smaller sizes set through Custom Radiosity, the trick with this file is the model is very simple and Fast Radiosity sets the sizes pretty coarse. It assumes more detail is in the model.