garf Posted September 12, 2019 Share Posted September 12, 2019 (edited) Hi all, I'm rendering some jellies, in water, in a glass tank. Any pointers as to how to optimise this? My render times are huge. Using mantra. Edited September 12, 2019 by garf Quote Link to comment Share on other sites More sharing options...
davpe Posted September 13, 2019 Share Posted September 13, 2019 with mantra, this will inevitably render long, I'm afraid. not sure what are your settings and such and how much render time are we talking. there may be ways to optimize, without inspecting the scene thou it's really hard to say anything relevant. but in general, for heavy refractions, mantra isn't a great choice. Quote Link to comment Share on other sites More sharing options...
kfu Posted September 13, 2019 Share Posted September 13, 2019 Yes, it took so long! My little ice render, with such low quality, still took more than 1 hour for one frame. Obviously I don't know how to optimize it. Quote Link to comment Share on other sites More sharing options...
garf Posted September 13, 2019 Author Share Posted September 13, 2019 thanks for the confirmation - I probably should have gone with redshift for this shot..... Ive swapped principled shaders for classic shaders, reflect/refract limits to 4, ray bias as high as I can, .rat textures and hdris. Quote Link to comment Share on other sites More sharing options...
Drughi Posted September 15, 2019 Share Posted September 15, 2019 As said, it will render long no matter what you do. But you could try to reduce the ray limits even further and set "At Ray Limit" to use light color. If you have fireflies reduce the color limit. Quote Link to comment Share on other sites More sharing options...
TobyGaines Posted September 16, 2019 Share Posted September 16, 2019 If you're getting a lot of noise the reflection / refraction channels, switch the brdf in your shaders from ggv to Phong ( I know I hate phong too ), last I saw, it was impossible to get sharp reflections with ggx, creating a lot of noise and a lot of extra render time to clean up. We covered a lot of that here, if I can find the conversation. Also I assume ( and hope ) you're not trying to use indirect diffuse? Maybe if you can get away with no motion blur, do that - just throwing out ideas - iirc, reflection doesn't need as much ray depth to look good as refraction does, try refl at 2? btw what do you consider "huge" render times? Some people think that's 10 minutes. Quote Link to comment Share on other sites More sharing options...
garf Posted September 16, 2019 Author Share Posted September 16, 2019 "btw what do you consider "huge" render times? Some people think that's 10 minutes" - I'm talking 10+ hrs on 16 cores Quote Link to comment Share on other sites More sharing options...
TobyGaines Posted September 17, 2019 Share Posted September 17, 2019 8 hours ago, garf said: "btw what do you consider "huge" render times? Some people think that's 10 minutes" - I'm talking 10+ hrs on 16 cores sweet jesus! what res is that? can you post any kind of scene, I'm sure we can whittle that down to size Quote Link to comment Share on other sites More sharing options...
garf Posted September 17, 2019 Author Share Posted September 17, 2019 4k - I can't upload a hip at the moment. I've resorted to a lot of comp trickery and some brute force to get this one out the door. I'll try and make a sample scene next week. Quote Link to comment Share on other sites More sharing options...
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