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Hi! Im always getting long render times when specular mats are in the scene. Also when playing with sss/roughness.
any tips to get it fast?

rushes wrote:Hi! Im always getting long render times when specular mats are in the scene. Also when playing with sss/roughness.
any tips to get it fast?

I'm not sure what kind of scenes you work on, but I've really found the glossy falloff trick to work well for architectural and even some vehicle glass. Instead of using a specular material, use a glossy material. Diffuse to 0, specular to 1, index to 1.55 or preference, and roughness to 0. Then set the opacity to a falloff texture and play with the falloff ratio, 3 is usually a good starting place for me. I found it works best on single faced meshes. Great for windows, as is lets a lot more light through into the space, which is great for render times and looks good too.

If I need to use a specular material in certain cases, I try to use Fake Shadows, since it lets more light thru which help clean up renders quicker.

That's all I got so far. I'm still trying to wrap my head around the SSS system in Octane and get it to work predictably, never mind how to optimize.

thanks, currently Im working on product shots. So bottles with glass and liquid inside.

rushes wrote:thanks, currently Im working on product shots. So bottles with glass and liquid inside.

Sounds like you need the specular material