CompuServe Messages

>> Please see pg. 7-163 in the 3DS Ref. Man. Thanks, but you obviously jumped in the middle of this or I was passed on to you for asking too many questions… I'll try once more. I'm comparing a 'shadow' cast by an object onto a surface by a ray traced light source with a calculated shadow created in AutoCAD. I was able to work out the precision of the ACAD method because the math involved was relatively straightforward. I like using 3DS images to describe shadow effects as they are much more clear. So… I am trying to determine the precision of the ray-tracing algorithms used by 3DS so that I might account for any differences in results. I realize this is probably not a simple question, so all I will ask for is the best reference which might describe the method used by 3DS for ray-traced shadows, (Vince doesn't really say much about it, Foley/Van Dam describe several). I asked specifically about the bias setting because I thought it might be a simple answer: does the setting affect the shadow placement along the entire shadow, or just where it is close to the casting object. Thanks again for any light you can shed… KJG [LFA] -Kevin Gilson