[Soc-2018-dev] Weekly Report #10 - Further Development for Cycles' Volume Rendering

[Brecht Van Lommel]

On Tue, Jul 24, 2018 at 9:05 PM Stefan Werner <stewreo at gmail.com> wrote:

> Correct. That’s how we sample every motion effect in Cycles. The trick to
> get the “smear” is that each camera ray gets a different (pseudo-)random
> time associated with it (ShaderData::time and Ray::time) and we sample
> everything at exactly that point in time. Given enough primary rays, the
> result approaches the integral over the open shutter interval. Adding
> motion blur should turn one density lookup into one velocity + one density
> lookup.
>

If we follow the paper it's actually two velocity loops, see formula (7).
One velocity lookup works as well, just lower quality I guess.
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