VrayHDRI - Unusually intense noise wouldn't clear up

[NorthZephyr]

Hey guys,

 

I'm coming back to Vray after a while using Corona.

Last time I used Vray was ver. 2.0.

Now seems like a lot of things have changed in 3.2, and I'm wondering if it is messing with my Vray setup.

 

Here's the simple scene: one closed room, two windows.

One Vray dome light with a PG hdri.

All white plain default vrayMtl.

 

First render is WITHOUT light, just HDRI int he environment slot. No problem.

Second render is WITH light, and it's just puking noise all over the place.

 

Sampling on VrayLight is 512!

Noise still wouldn't clear up!

And the rendertime for that single 900px image was 4 minutes!

 

Render settings are:

Adaptive min/max 1/8

Color thld: 0.005

Irradiance map on High - subdv 250

Light Cache subdv - 1500

 

PC specs:

i7 5820K @ 4.0Ghz

32gb DDR4

NVidia GTX550

 

Is there anything I'm donig completely wrong?

In Corona, a simple HDRI in the environment slot clears up this scene in no time...

 

Thanks a lot!

 

http://drive.google.com/uc?export=view&id=0B6dAPhn3exiuZWdvbVZ3RkExT2s

 

http://drive.google.com/uc?export=view&id=0B6dAPhn3exiuR2sxcVVablZTb2s

 

http://drive.google.com/uc?export=view&id=0B6dAPhn3exiuNjNsQjFqXzVBb2c

[citaandrei]

try unchecking Probabilistic lights in Global Switches. Be in expert mode to see it.

[Francisco Penaloza]

Hi,

Some important thing have changed in V Ray 3.x first and more important 'Min shade rate'. This is the way of V Ray to be more "simple" to use.

in Theory you leave everything default and only adjust the minim shade rate value and the antialising.

 

This mean that it does not matter how many samples you have in your lights or glossy shader, V Ray won't use them, unless you you tell V Ray to use them, this under the Global DMC, check box 'use local subdivs'

 

Probabilistic lights is other issue, and they seems to be working on it, you can disable it if you like, or just put the same amount of lights in the number box. The default is 16, if you have less than 16 lights it should not make any difference really.

If you feel confortable with an 2.X VRay version work flow.

Just set your min shading rate to 1 and check the use local subdivs box, and you should not have any issues.

 

BTW your images are not showing.

[zhiyaochen]

Hi,

Some important thing have changed in V Ray 3.x first and more important 'Min shade rate'. This is the way of V Ray to be more "simple" to use.

in Theory you leave everything default and only adjust the minim shade rate value and the antialising.

 

This mean that it does not matter how many samples you have in your lights or glossy shader, V Ray won't use them, unless you you tell V Ray to use them, this under the Global DMC, check box 'use local subdivs'

 

Probabilistic lights is other issue, and they seems to be working on it, you can disable it if you like, or just put the same amount of lights in the number box. The default is 16, if you have less than 16 lights it should not make any difference really.

If you feel confortable with an 2.X VRay version work flow.

Just set your min shading rate to 1 and check the use local subdivs box, and you should not have any issues.

 

BTW your images are not showing.

 

Francisco, that just cleared alot of questions for me, thanks a lot.

Vray 3.x docs is quite unclear on that aspect, and should definitely include a general note like yours for people transitioning from 2.x