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Comparing deformation ignoring translation/rotation


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I’m trying to compare two meshes with the same topology. Problem is one also has certain amount of drift. What’s the best way to map the deformation to a value?

 Currently I’m taking some reference point that doesn’t deform so much and trying to align them first, then taking the position deltas.
 

But that alignment method is still a little unstable.
 

Another idea I had is to use the lengths between each neighbour, but I haven’t figured out how to use that data yet.


Has anyone done this before? Thanks

Edited by danvenn
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Hi,

here is an example (taking your idea using the neighbour distances). If you are applying translation or rotation, the length should stay the same, so the delta between both distances is expected to be zero. On other deformations, the delta should be greater zero.

the final delta is just the sum over all delta foreach point (detail attribute).

sum_over_delta_nei.hipnc

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On 2022/6/30 at 3:02 PM, danvenn said:

Currently I’m taking some reference point that doesn’t deform so much and trying to align them first, then taking the position deltas.
 

But that alignment method is still a little unstable.

try aligning firstly by using calculated matrix,the matrix comes from comparing 2 poses of the minimum deformed feature points,

then get position deltas and apply,hope it helps

DefMap_v2.hiplc

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