[Bf-modeling] A question on deform vs non-deform modifiers

[Patrice Gmail]

Hello,

I am working on a modifier that adds noise (random translation and 
rotation) to a mesh.   It has 3 modes or 'scope' of noise.

In SCOPE_VERTEX, each vertex is individually translated by a random 
vector, the maximum amplitude being configurable.

In SCOPE_WHOLEMESH, the mesh is translated and rotated as a whole 
without any deformation.

In SCOPE_LOOSEPARTS, each loose part is translated and rotated 
individually.

I have implemented the first 2 modes easily, using a Deform Modifier 
function.

The loose parts mode is more difficult.   Although ultimately all I aim 
to do is a deformation, I do need to use the BMesh data to iterate using 
BMW_CONNECTED_VERTEX. I can thus walk through each loose part.   But 
deformVerts is supposed to just modify the vertices' coordinates given 
in float(*vertexCos)[3].

So my question is:   is there a way to somehow relate the vertexCos to 
the BMVerts that I'll walk through ?

Then again, maybe I should give up using a deform modifier, and go for a 
Non-deform Modifier, which is more powerful.

Any expert help welcome.   Many thanks.
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