[Bf-committers] WeightVG modifiers and WeightPaint mode

[Bastien Montagne]

Hi blender coders!

I’d like to have your advice about a problem I’m facing with my WeightVG 
modifiers.

When there is a *constructive* modifier higher in the stack, I can’t 
paint at all weights in WP mode – nothing happens when I make strokes, 
and it very quickly generates sigsevs (not always at the same place, but 
the problem seems to occure most often in the MEM_mallocN allocation 
inside copy_dverts()…).

As far as I can understand, the WP mode only works on base data (i.e. 
ob->data Mesh stuff), so it shouldn’t be affected by modifiers? 
Especialy if they copy the whole DerivedMesh before modifying the weights…

I really do not understand what’s going wrong here – but WeightPaint 
code is not so easy to grasp, so I may be missing an important point… 
I’ll continue to read and learn it, but if one of you had (even a start 
of) an idea, it would be most welcomed! :D

Cheers,
Bastien