Dan Lee

dlee

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Karma slower (and noisier) than Mantra - PYRO VOLUME LIGHTS Oct. 3, 2022, 9:49 a.m.

Hi. Karma's volume rendering is broadly faster than mantra, but volume lights may be faster in mantra: mantra's volume lights are a pointcloud-based approximation that produces very biased results. Karma aims to produce much more accurate results but it may come at an added cost.
In cases such as above where the volume is close to surface receiving emission, I might recommend disabling "treat as lightsource" entirely and rely on indirect bounces instead (and enable it in cases where the volumes are difficult/unlikely to be sampled by indirect rays, e.g. faraway sources or thin trails).

Karma XPU Volume LPE - Optix fails Aug. 10, 2022, 7:18 p.m.

Hi. Can you try the latest daily build? There was a bug fix regarding this in 19.5.325.

Problem with Karma and materialX Aug. 9, 2022, 7:56 p.m.

Hi, Can you please log a bug with your scene file? Thank you.