Blotchy/noisy GI calc, with IR and LC

[dmarques1177]

I am in Maya2012 V-ray 2.00.03

Trying to get a good render out of a transparent plastic bottle, with transparent liquid and transparent cap. All these refractions are causing splotchy noisy artifacts in my render, I am reading the info at:

http://www.spot3d.com/vray/help/200R...vancedimap.htm also at http://www.spot3d.com/vray/help/200R1/render_params_lightmap.htm but it is all based in 3dsMax (seems like every piece of info online for anything CGI is always for max)


"Hemispheric subdivs (HSph. subdivs) - this controls the quality of individual GI samples. Smaller values make things faster, but may produce blotchy result. Higher values produce smoother images. This is similar to the Subdivs parameter for direct computation. Note that this is not the actual number of rays that will be traced. The actual number of rays is proportional to the square of this value and also depends on the settings in the DMC sampler rollout."

^ how do I tweak this for Maya v-ray? I am doing some tests on the LC and from what I see the artifacts are mostly from the IR which would be exactly this mentioned above. I think...


Regards,

DM

[griml0ck]

I don't think its possible to get GI to work with refractive materials. I've never had any luck with that. If I remember correctly the workaround is to set a vray object properties node on all refractive objects and uncheck "visible to GI". Since glass don't need any GI anyway it doesn't affect your render. And you don't get noisy GI. And you need refractive caustics checked in your GI settings I think, otherwise the GI rays will not go through the glass.

[dmarques1177]

Hi griml0ck

I ran a few renders here and that appears to be the right workflow, before i was spitting out 640x480pix renders with splotchy noise in 30min...
now they are noiseless and take about 1:13.5s - amazing

The refractive caustics were on by default, if I take them off it still shows transparency no difference there.


Cheers

DM