meshquality: What does it represent and what is a good number?

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According to the documentation:
  • meshQuality evaluates the shape quality of mesh elements and returns numbers from 0 to 1 for each mesh element. The value 1 corresponds to the optimal shape of the element. By default, the meshQuality function combines several criteria when evaluating the shape quality.
What are these "criteria"? I believe it should a combination of aspect ratio, max/min size, angle, Jacobian, etc. But it would be good to see how it is calculated...
And what is considered to be a "good" mesh? above 0.3, or 0.5, or 0.7?
Q = meshQuality(model.Mesh);
elemIDs = find(Q < 0.5);
My idea is to find all elements with a quality lower than a certain threshold and locally refine the mesh. Which brings me to another question....
I know that you can locally refine mesh using 'Hvertex' and 'Hedge'. But can you do the same thing based on elemIDs?
m3 = generateMesh(model,'Hedge',{1,0.001},'Hvertex',{[6 7],0.002})
This would require the generateMesh function to refer to model.Mesh rather than model itself ... which doesn't seem to work:
Check for incorrect argument data type or missing argument in call to function 'generateMesh'.

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