nmorgan
It would be nice to have a direction of compression/stretch in relation to the UV coordinates in addition to the colors generated--whether it's using the other 2 channels of the vertex color (B and A) or creating a separate node for the compression and stretch maps.  In other words, using the red and green channels of the vertex color to store the U and V compression of the vertices, and the blue and alpha channels of the vertex color to display the U and V stretch of the mesh as blend shapes are activated.  In this way you can get not only which faces are on average stretched or compressed, but the direction in which they are stretching and compressing.  This would be incredibly useful for creating additional wrinkle maps for face shapes, as it would be easier to control the direction of the wrinkling (as it is/should be anisotropic.)
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pshipkov
If memory serves well, there was a DD specific tension mapper that does this kind of stuff. Code should be still in the version control system.
It was long ago and most people who where there at the time are not at DD anymore, but ask around and see if somebody can point you in the right direction. There was a wrinkle maps system that people used exactly in the way you described, and more.

Other than that - i am adding your request to my to-do list. It makes sense to have this available in SOuP.
Thanks.
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nmorgan
Awesome, much appreciated.  Thanks, Peter!
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pshipkov
Btw, i just realized that you can do this right now.
Check the attached file to see how it works. Grab a point, use soft-selection and move it around. Or apply a deformer, etc.
tensionMap_directionVectors.png
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