you did awesome work, Kevin!

I can't compile blender at the moment :-(

I changed the patch to "archived" to reflect what I stated in my initial post.
This is not for review but for archieve.

As I said, this replicates the bevahiour of the elbeem motion blur from blender internal. Nothing more, nothing less.

You should also note, that Cycles devs could complain about the location where I put my code ;-)

Sorry!

@ sergey: Thanks for adding me :-) I totally agree with your comments.

Hey everyone.

I tested version 2.57b and it was (sortof) working.
But while I was playing with it, the feature confused me more than it helped me.

A note: "cloth_uses_vgroup"
"cloth_uses_vgroup" is used by the modifier stack to ensure that the necessary custom data layers are generated. In this case we need vertex group layers sometimes. It saves alot of time, if we don't request the custom data layers for vgroups if we don't use them. That's how every modifier does it :-)

Forgot the file...

I did take another look at the bugfix patch and looks not bad.

Commited, thanks people! Please test and tell me if there are any problems (with a blend file please!)

Closed by commit rB1ab86e3f1fa8.

I agree with the problem layed out in this task!