Incorrect skin weights

Hi, I export to FBX(maya) model + skeleton.
For some reason there are distortions in unity (I think it's a problem with weights, how do I fix it to make the model look the same as in maya?)

Thank you in advance.

 

You will probably have a error saying that unity didnt found the weights.
If that is the case, reassign the weights in maya carfully and checking every bone.

 

Did you make the model?
Game engine have generally a limit on the number of weight asigned to a bone (typically 4), but there should be way to go around this as it was an old limits, so first thing is to try to find documentation about how unity handle this. Second is that when exporting there is options to compress the weight more or less lossy, I would check the import options in unity to see if this is not set to radical setting, you should research about mesh import in unity doc.