Vray Backburning: Results differing with processor

[mr.mm]

Hello everybody,

I´m just rendering an animation with vray and backburner.

I got ugly light leaks (black spots) on some machines. All machines use vray 1.47, viz 2006, an winxp home. The errors occur on a P4 3600 MHZ and a PM 1600 MHz. At the P4 I turned HT off then it works but the the light leak occurs on the PM.
I think it is related to the GI lightcache settings. I tried different numbers of lightcache passes with no improvement.
Realy strange is that the same settings work on one machine but not on the other. I there anybody with simelar experiences???

Greetings.

Markus

[mr.mm]

P.S.
I tried to prerender the lightcache file with HT on and 2 passes, lowest possible sample size and 1200 subdivision but then I got light leaks on an amd processor.
Now I turned HT at the P4 off and I render the animation with 1 pass and single mode. Seems to work but would be thankful for some theoretical background

[vlado]

It would be helpful if you post in image with the problem you are having (e.g. what does the light leaks look like).

Best regards,
Vlado

[mr.mm]

[vlado]

This doesn't look much like a light leak... what materials are you using?

Best regards,
Vlado

[mr.mm]

It´s a architectural material with map in the diffuse slot. I had no problems with this material so far.

Greetings,

Markus

[percydaman]

dont use architectural materials. period.

[jacksc02]

architectural materials are based around max's raytrace material which will give you nice splotches

[Da_elf]

but hey. if its the slotchy look your going for then i recommend using it. especially if your doing a paintball field. then throw in raytrace materials, architectural materials. some sandard materials with anistrobic and metal shaders, oh. and if you rotate a gradient ramp 90 degrees to use as your sky then thats alot of fun in glossy reflections hehe

[jacksc02]

ooh da elf, your a smart arse!

[Da_elf]

somebody has to be. and hey. when someone goes to make a paintball field they just might thank me