Laplacian Deform incorrect with > 10K faces #39004
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Reference: blender/blender#39004
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System Information
OSX 10.8.5
Blender Version
2.70RC1
Exact steps for others to reproduce the error
On my computer, the mesh distorts like crazy. If I subdivide 4 or fewer times, the results are perfectly correct. If I subdivide 5 times, then it "jumps" after binding, though not as severely as with 6 times.
It appears to want to pull the mesh in to the origin, while still respecting the added constraints.
Changed status to: 'Open'
Added subscriber: @supergra
Added subscriber: @PatriceBertrand
Added subscriber: @mont29
Added subscribers: @AlexanderPinzon, @Sergey
@AlexanderPinzon, ind checking on this one?
I'll check.
Added subscriber: @brecht
This is a precision issue in OpenNL / SuperLU. I've seen similar issues with UV unwrapping of high poly meshes.
Doing
s/float/double
for all files inintern/opennl
solves the problem here, and seems to help nicely with UV unwrapping too. Run time is almost the same, doubles are pretty fast on modern CPUs and might help the solver to converge faster too. The main issue is doubling of memory usage, but I guess that's acceptable if the solver is otherwise quite useless for high poly meshes anyway.Single precision bites again...That's been a perpetual headache for using (otherwise stellar) Blender my work.
Nice find.
I don't suppose there's a special build option to universally convert Blender to using doubles is there? That level of precision would be worth the memory overhead for me (not for 99% users, I know).
There exists no build option for it, and I don't think it would be easy to add. Globally replacing all floats by doubles can't be done automatically, there's various places where things would break (file read/write especially).
This issue was referenced by
0b12e61040
Changed status from 'Open' to: 'Resolved'
Closed by commit
0b12e61040
.Fix committed now, thanks for the report.
Here's an example of how this helps for UV unwrap, before and after.
This issue was referenced by
ac234067e1