Delta Mush

[edward]

Because there's no changes when you first create it from the Network View pane. The sopcreateedit command specifically creates an Edit SOP with the changes between the two specified nodes.

http://www.sidefx.com/docs/houdini14.0/commands/sopcreateedit

[Skybar]

Ah right I see, I never thought to look that up. Cheers Edward!

[AaronAb]

Looks like someone at Naughty Dog has used delta mush to generate shapes for an example based skinning solution: http://www.cgmeetup.net/home/semi-auto-skinning-framework/

 

 

 

Wondering if the same couldn't be done in Houdini, blendpose CHOP (not shelf tool) gives us two methods for matrix decomposition.

 

 I've used a skinning by example solution in the past and it was a huge time saver and massively increased the quality of linear blend skinning. It would be nice to have it in Houdini.

Edited April 9, 2015 by AaronAb

[fathom]

Thank you for reminding me. I checked, it really can not rotate. Then I checked the algorithm, it was no problem. The problem was in the edit node. If you rotate a geo who was edited by an edit node it will be break. I think use bones rig or other way to deform it will no problem. Maybe I misunderstand you.

i realize this is a bit old, but i was looking for a quick delta mush and found this setup.  there's a problem with this setup, tho.  the basis matrix from the rest position shouldn't be used to project your displacement back on your deformed shape, you should pull a new reference frame from the deformed geometry and use that.