I keep telling myself to put stuff on this blog and I never do.. So I figure just do quick bursts.
I'm sure most people do this already , but I thought I'd throw it out there.
The image below shows 3 pieces of geo, that upper flap thing there was giving me trouble weighting quickly as the weights on the bottom and top didn't line up, so in many positions that geo would penetrate.
a fast quick way to do this is to duplicate your geo and cut off the offending part, and make it a single surface.. In this case I had multiple issues with this geo, so I ended up making 2 extra pieces.
In this case mirroring and copy skin weights tolerances were too high, or just didn't want to work like I wanted them to, so I knew I couldn't do a regular copy skin weights.
so the blue geo is a copy of the orange geo ( the hero geo) , that I did a base smooth bind to and smoothed the hell out of it using smoothFlood.mel ( which I love) .
after getting a semi decent but still penetrating weight map on this flap, I then duplicated it again, and cut off the flap and then cut it in half.
I then copied weights from the blue to the cut off flap..
I did minimal weight fixes to the flap. but it was fast as I didn't need to deal with a volume surface.
I then reversed the process and copied the weights from the cut off flap to the blue geo. but I did the copy ONLY to the verts I wanted.
To do this select your first piece of geo, and then rt click on the second geo and choose vertex to enable vertex selections , Do not hit F8 as you want your first geo to remain selected as it was.
you can then shift select the verts you want to copy to , and then run Copy Skin Weights.
which I did for other parts on the blue geo, and then eventually did the same to go from the blue to the hero orange geo.
( you can also make a set of the verts you want to copy to , and just shift select that )
okay, hope that helps someone..