Hi

realy need help on this one

Trying to follow @John-Lynch example in his sig2022 video (https://www.sidefx.com/houdini-hive/siggraph-2022/#vellum) starting at 19:00 I cant get my vellum sim to work. I must be doing something wrong but I cant get My head around it????

Please

THX

this seems like a bug

it comes from the v@rest attribute on the constraints, which is technically correct as its just supposed to be used for shapematching
but for pieces that are rotated exactly 180 degrees around any axis it causes some phantom forces

so you can either make your 90 degree rotation on copy1 into 90.1

OR

check Update Rest State on Vellum Unpack

and in either case maybe submit a BUG

Hi Tomas

a very big thanks for your answer, what a hidden "bug" !!! I wonder how you came to discover it!!!!

THX again

Malik