[Radiance-general] Aiming Failures and Geometry

[Marcus Jacobs]

Dear Group

I have a question concerning an issue that I am encountering with illum 
objects that were created with mkillum and the type of polygon that is used 
in conjunction with it. I perform quite a bit of my modeling with 3D Studio 
VIZ. This is more or less a "lite" version od 3D Studio Max. As many of you 
may already know, virtually all of the geometry no matter whether it's a 
sphere, cylinder, plane, etc. is composed of a multitude of triangles. To 
create my windows, I generally model them as a plane. When I export the 
scene to RADIANCE (using ConRad), all of the planes are converted to 
individual triangles. I have no problem using mkillum to create the illum 
modifiers for these polygons. The problem comes when using rpict. Once 
rendering of the scene begins, a bunch of "Aiming failure" error messages 
are generated for all of my window polygons. It doesn't matter what value 
for -dj I use, this error message still occurs. As an experiment, I decided 
to create the windows in AutoCAD. Using Desktop RADIANCE's conversion, the 
windows planes were translated to Radiance as four sided polygons (as 
opposed to three when modeled in 3D Studio). The polygons were modified as 
illums with mkillum and when rendering with rpict I had no "Aiming failure" 
error messages. My question is does anyone <coughGreg> know if Radiance has 
any preferences for a polygon type when the polygon is modified by an illum 
primative?


Thanks

Marcus

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