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mkazhdan / ShapeSPH

Shape Spherical Harmonics (Descriptors, Alignment, and Symmetry)
MIT License
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What is noCQ? #5

Open Miraclelzk opened 4 years ago

Miraclelzk commented 4 years ago

Why frequencies 0 and 2 do this

Miraclelzk commented 4 years ago

and Why do you need to normalize in the end

mkazhdan commented 4 years ago

In general, the invariance is obtained by storing a value per frequency. However, recognizing that the combination of of frequencies zero and two can be expressed as a quadratic form and using PCA it is possible to get three invariants for frequencies zero and two.

mkazhdan commented 4 years ago

Can't remember why we ended up normalizing in the end as scale is already accounted for...

Miraclelzk commented 4 years ago

I found that the implementation of the code has some details not mentioned in the paper. Are you the author of paper?

mkazhdan commented 4 years ago

Yep

Miraclelzk commented 4 years ago

Your code is awesome and super efficient. I still have a question. Is there any basis for using sqrt(8) for the fallOff parameter of EDT? Is it determined empirically?

mkazhdan commented 4 years ago

I think it's empirical.