Rendering smoke with PBR

[edgem]

Hello everyone,

 

Called some expert in Mantra PBR rendering on volumes. I am trying to render smoke with mantra but I get very different result from the viewport plus artefact (dots). The final result is way more denser and not as transparent as it should be. I am wondering how to get a similar one from the viewport which is the kind of smoke I want. I am using Mantra PBR to render. Currently it's halfway and 28 minutes per frame, which is...I think way too much and I tried optimized the settings. To be honest, I think it is still too grainy.

Here are my specs and settings :

 

 

Specs :

i7 3930K 4.2 GHz

Nvidia Geforce GTX 970 

32 GB RAM

 

 

Settings :

Resolution : 1920 X 1280

Using billowy smoke shader at default settings

Motion blur disabled

Pixel Samples : 6 x 6

Jitter : 1

Min Ray Samples : 1

Max Ray samples : 12

Noise Level : 0,01

Volume Quality : 0.2

Volume Shadow Quality  : 1

Stochastic Transparency enabled

Transparent Samples : 10

 

 

Here are the comparison pictures. First is a capture from the viewport. Second is rendered

 

Thanks

Edited November 28, 2014 by edgem

[pbarua]

Your Transparent Samples very high which take a lot to calculate. That's why your rendering is slow. 

[pbarua]

For volumetric rendering better to increase Volume Quality.

[edgem]

So I tried decreasing the transparent samples but it still feels way too dense compared to the viewport one, so much that it becomes over exposed.

Edited November 28, 2014 by edgem

[rayman]

Check your volume shader. If you are using pyro shader you can import settings from visualisation and they will match viewport as close as possible.

[edgem]

I am using billowy smoke shader, am I not supposed to use that for smoke ?

 

I will look into that pyro shader

 

Thanks

[pbarua]

You can use billowy smoke shader without any problem.

Pyro shader have option (under Utils tab) to transfer visualization to viewport.

[Rainroom]

You might need to play with the density multiplier parameter in your shader. And as others have mentioned its always best to import the shader's parameters into your volume visualization sop. It sort of gives similar results.

[edgem]

Thanks everyone,

 

I have switched to the pyro shader and it looks much better now with volume visualization op. So many controls inside

 

I have managed to get a decent look I did not get with the billowy shader 

 

 

Thanks for all the advices and methods

Edited November 28, 2014 by edgem