vray 3.0 brute force

#1

hi,

i know the brute force method for vray tend to take very long times, but maybe someone can help me speed it up, as vray stay on 0% for 1.5 hrs

my gear : 2x Xeon e5-2660 v2 @ 2.2ghz (20 cores), 16 gb ram

vray Image sampler : Adaptive, shading rate 2, min subdivs 1, max subdivs 24, threshold 0.010
DMC sampler: adaptive amount 1, adaptive thr 0.01, ada min samples 8, subdivs mult 0
gi: brute force, multiplier 1, subdivs 8, depth 3

would be nice if anyone can recommend something for the image sampler or the dmc sampler.
the scene is a bathroom with glossy walls, marble floor, porcelain toilet and some other chrome objects

#2

It may not be the GI that’s the problem, though I’m fairly new to VRay at the moment.

With the DMC subdivs mult set to 0, you have basically turned off the DMC adaptivity feature I think, so it’s not that. The image sampler settings seem ok.

Does it render fine with GI turned off? What about with Irradiance mapping? Or, does it render ok with your image sampler threshold set higher, say on 0.05 or 0.1?

It’s hard to say without seeing the scene. I have used the brute force mode in a few animations and it hasn’t been too bad.

#3

thanks for the reply, i already figured it out, i changed the image sampler to progressive and used light cache as second gi, brute force and brute force seem to be very slow for the scene