[Bf-cycles] Hair Rendering and Steps?
zauber at gridmail.org
Thu Feb 19 04:48:41 CET 2015
Okay, this post is about a performance oddity that I have noticed with
What I am seeing deals with the Steps property, under the Render panel
in hair properties. While tinkering with it I found that each 1 step
reduction results in the render's memory usage being reduced by half,
which makes sense given the description. As an added bonus, it reduces
the build time for the render.
However, on the flip side I have found that lower values seem to
increase the final render time. Below is the rendering times, measured
on one of the current builds off of buildbot (hash fda1198)
3 Steps: 12.20s
2 Steps: 12.90s
1 Step: 16.81s
0 Steps: 28.04s
3 Steps: 23.60s
2 Steps: 27.15s
1 Step: 38.96s
0 Steps: 80.24s
Now, this isn't quite what I was expecting. If there's less
geometry/data to process, then in theory shouldn't the render times be
Is this expected, or have I spotted a performance flaw or regression?
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