Translucency

[syrez]

Hi,

doing some research at home, for work and myself, with the 3dsmax 2014 vray 3.0 demo. Coming from Maya 2.4 vray i'm trying to achieve the following effect.

Standard sphere light in a refractive cube, the light scatters through the cube, making it glow from inside.
Took me 3 minutes in Maya. But resignating now because I'm getting insane after hours in Max.

max settings that differ:
- probably some scene unit scaling, i have to reduce fog multiplier
- even though max should be color managed, i have to untick SRGB in frame buffer, to not get extremly bright rendering
- change "treat glossy rays as GI" to Always, or I will only get "black" in the inner cube. don't know that option from maya ?!?
- untick divide shading subdivs or i will only get extremly noisy rendering
- set min shading rate to 1, as to get same behaviour of sampling as in maya 2.4 vray

can anyone help me?! what do the translucency types do? which one compares to maya?
where is the scatter bounce, and subdiv option that i know from maya in the translucency tab?
and why do the effects look so completly different?

[syrez]

well, as it's more or less my 100th test scene, and i'm loosing track a bit. i increased the fog multiplier now. and it looks more like what i want.

but, what about the sampling. maya translucency subdiv differ to refractive subdivs. and render much faster. i just have to increase them a bit and it get's clean

to clean up the noise in max, i only have the refractive subdivs, which i have to tune up very high, and it renders very slow.

to visually match the noise, i have to set max refractive subdiv to 32 = 1 minute rendering
compared to translucent subdivs in maya = 16, 10 sec rendering

[syrez]

edit: sry, made a post with faulty conclusion.. getting insane here..

but i'll give up now. countless hours of trying to understand this. and not getting a clue.

[vlado]

You will have more luck using VRayEnvironmentFog with the cube as a gizmo. The translucency in the VRayMtl material in Max and Maya is different; in Maya it's a lot more like the environment fog.

Best regards,
Vlado

[Mokiki]

Hmm to get close to your maya result you'd need to reduce the refraction glossiness.
At least I got pretty close at around 0,65 (refr glossiness) light multiplier 2 (inside transclucency settings).


*edit* actually disregard my post. Oddly enough when I raised the subdivs to get rid of the noise the cube also got darker again. Don't really have the time right now to test this some more.

[syrez]

Vlado: thank you. Already found it out over the weekend! And it's exactly what i want.

I don't know about any other differences between Max and Maya or other packages, but maybe you guys should point them out somewhere . One might think, same renderer and settings should work the same in any package

ralphr: appreciated thanks!