OTOY Forums

I'm trying to optimize an interior scene using a lot of SSS in a specular material. Setting tests are taking a while so I thought I'd ask the community. Does Path Term. Power affect SSS? Does adding lights or making them bigger generally help SSS render times or hurt them? Thanks!

Hi Gary,

The first thing is to render only small resolutions, because the number of pixel is the square of the image size.

Then you should keep the path lengths down, maybe setting "diffuse depth" to 4 and "specular depth" to 6 or 8.

If you can live with some initial splotchiness, try setting the "coherent ratio" somewhere between 0.01 and 0.1 and enable "static noise".

Maybe set the "caustic blur" to 0, which will speed up rendering, but you may get some fireflies if you are using the daylight environment. In this case you want to set GI clamp to ~ 10/exposure, i.e. if your exposure is 0.5, you would set it to ~20.

You may also play with the path termination power, but the default usually works best here.

Other than that I can't think of anything else right now.

Cheers,
Marcus

Thank you!