How to read out stretch

[josemendez]

Thanks for your help, that sounds nice, the rough estimation would be totally sufficient for me. The cloth mesh is not tooo huge as well (ConstrainCount is 620). Maybe I could even skip every other Particle to optimize or so.
BUT.. the moment I divide distance / distanceBatch.restLengths[i] I get NaN! 
So the final result is also NaN. Is this some weird floating point precision problem?


Also I am not sure about the GetParticlePosition ? Is it correct using it with cloth and the dot operator? It gave me red squigglies when I had it directly like in your example...

Code:

  float distance = Vector3.Distance(cloth.GetParticlePosition(distanceBatch.springIndices[i * 2]),
                                              cloth.GetParticlePosition(distanceBatch.springIndices[i * 2 + 1]));

Thank you!
J

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Aha, it appears there are a few zeros in the distanceBath.restLengths. Checking and adding 0f instead seems to do the trick. Thanks again!

A restLenght of 0 indicates a zero-length edge in your mesh. This should generally be best avoided as it is a form of non-manifoldness, but if it works for you then I wouldn't worry too much.

GetParticlePosition() is part of ObiActor, from which ObiCloth is derived. Depending on where you're writing this code you should be able to call GetParticlePosition() directly.