How to make fog on 3DSMax?

[paride4331]

Hi,
2014 attached
Ragrds
Paride

[Fabrice]

Yeah it's a trick.
But it lacks some god rays
Thanks Paride.

[thekwen]

Alpha seems not to work with this solution.
Also it seems not possible to have fallof on borders.

Sorry but without that two options this solution is useless in production.
Still waiting to have what otoy sold us ...

Kwen

[paride4331]

Hi thekwen,
about fog with alpha you should use the subsurface layer scatering.
To work with falloff, you should create a mixmaterial adding a material such as fog, without medium and adding falloff map in opacitiy.
Regards
Paride

[thekwen]

Thx paride but as i already said, tell us what u need we'll tell you how to dispense from it,
Seriously, such a heavy process fo a simple volumetric light ?
This is not productive ! i can do it faster and better with scanline ...
If i was doing 3D for fun ok but it's not my case.

Please just make work the software we buy.

Kwen

[coilbook]

i know it might be off topic but can we have better quality VDBs rendering. it is just very very noisy even with hi samples. Can we have sample spinner for VDBs inside medium materials? maybe octane can send more samples towards VDB and less around it

[paride4331]

Hi coilbook,
Adaptive Sampling is perfect for that, it do exactly what you want.
Regards
Paride

[acc24ex]

managed to do something like this with the above file - added faloff on the opacity channel on top of all of this.. that dispersion around the edges is the key - I tried getting the same result through the scatter node, but didn't appear to be achievable.. - it's slower with the alpha channel on

..basically it is a huge pain in the ass to do anything with volumetrics, it seems something is achievable through this cone/sss technique - only it will go through the geometry (maybe if the volume detects and automatically booleans the cone with any geometry it touches.. can be achieved - or - some workaround the octane team could do inside the 3dmax plugin).. like at least it can behave like a post effect, or create some fake volumetric light.. or bring us example scenes with usable setups to analize from..

- BTW check this one for volumetric photos just cause it's nice: https://vizkultura.hr/izgubljena-noc/

[paride4331]

Hi acc24ex,
You're right but with Adaptive sample and expected exposure, sss calculation is helped, time is very optimized.
About blurred edges, a system might have a bit geometry larger than your beam of light.

[coilbook]

i wish we just had an option volume lights on under octane light properties like vray has