hmmmm... (render,render,render) Ok, sounds good, but still a couple of seemingly inconsistent results that I could use some help with. First, my previous diagram above was calculated using the Front camera. (I know, bad idea) When you guys mentioned getting predictable results using normal screen units I tried it again and to my surprise, I got different lighting results when the same scene was rendered with the Main camera in approximately the same position. What rendered as lit from the Front camera -- came out unlit from the main camera without any other changes in the scene. The point being that choice of camera may affect lighting results. Ok, just forget the front camera issues for now, its goofy and nobody uses it for real renders anyway. With regard to the values in the DistStart &DistEnd dials being standard Poser screen units, consider the following:

Falloff Occuring at Distance Greater than Dial Setting

DIAG #2: -light at 2.700(z), -front surface of stairs at 1.000(z), -front surface of large box at 0.000(z) -DistStart=0.650, DistEnd =0.950. Expected all objects to be UN-LIGHTED as both DistStart and DistEnd values were less than the distance to the nearest object. Results: ALL LIGHTED???, but clearly working, with falloff starting at about the second stairstep and ending at the front of the box. As stated before, though I can get the results I want, it just does not seem quite as predictable as previous posts suggest. No biggie, but if we suggest that this stuff is simple and predictable we're gonna drive nubies crazy. The fact that using Poser screen units as a basis for the settings on this dial did work in petercat's illustration, appears to be coincidental and cannot be applied, as my second example shows, as a general rule. If they were standard Poser screen units then I should have gotten the above result with the values DStart=1.700 and DEnd=2.700 not DStart=0.650 & DEnd=0.950. Just reporting differing results. Can't explain it. As JK asked: "What part of this am I missing" also? Here's the .pz3 (about 100K) if you want to reproduce these results yo-own-self: Lighting Falloff PZ3.zip -Nance ...still in the dark (BrainFog Start=0.000 BrainFog End=0.001)