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Custom Rivet

February 18, 2018

So I have a pretty good understanding of how matrices work in Maya, but that's a very different thing from being able to apply that knowledge.  So I decided to try and create a matrix based rivet. 


So attaching a locator to a surface is easy if you know about the four-by-four matrix node. Just create a point on surface info node and plug the position, normal vector, and one of the tangent vectors into the matrix and then turn the matrix into tranform attributes using a decompose matrix node.


But that's been done before, so I wanted  to try for something more complicated. I wanted to implement a twist and normal distance attribute on the rivet. The end result was this.



 The difference between this system and a simple matrix rivet constraint is that instead of directly plugging in the position, I scale the normal vector and add it to the position vector. I also do some trigonometry with the normal vector and the surface tangent vector to create the twist (that's what the expression node is there for).


In retrospect using a compose matrix node and a multiply matrix node would have been a far easier way to implement twist, but it was nice to practice applying trig to Maya (and refresh my expression syntax knowledge).


If I ever decide to revamp my surface based facial rigging script then this would be a much better method of turning vectors into transformations (originally I used aim constraints).  


This was also great practice  for understanding the math behind the UVN deformer using matrices.







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