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fluid with motion blug gets darker


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hey

I'm rendering some fluid with mantra, and I noticed that if I turn on motion blur the fluid gets darker, I thought it was an issue with low samples and noise, but even if I crack up the samples the fluid is still very dark compared to the image without motion blur

water_blur.png

water_noblur.png

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Hi, it seems the problem is more on the edges, and that you have a semi-transparent shader, right ?

I would try, although that's just an intuition, to play with the Refraction Quality, the max ray samples, the Stochastic transparency and of course reflect and refract limit (increasing them : I am not sure if when enabling motion blur, you don't increase the number of surface the ray must go through into a tranparent shader...)

That's just for testing... let us know if that improves things.

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