Forums Technical Discussion Vellum dynamic restlength by attribute

Vellum dynamic restlength by attribute

   2323   5   1
User Avatar
papsphilip
Member
385 posts
Joined: 7月 2018
Offline
 
I am trying to change the restlength dynamically during the sim using an attribute. I am creating the mask attribute on the constraints on Sop level and then referencing that inside the Vellum solver with a geometry wrangle running over prims.

Doesn't seem to work, but can't figure out why. Any tips?

Attachments:
vellum_dyn_rest.hiplc (544.1 KB)

 Report
User Avatar
Enivob
Member
2529 posts
Joined: 6月 2008
Offline
 
I'd use a Vexpression to assign the restlength, and a popwrangle to manage the Cd.

It's not very pretty, but here's proof of animated MOPs attribute transfer.

Check out this topic, too:
https://www.sidefx.com/forum/topic/87302/ [www.sidefx.com]
Edited by Enivob - 2022年11月16日 16:23:58

Attachments:
mop_vellum.gif (252.4 KB)
ap_vellum_dyn_rest.hiplc (570.7 KB)

Using Houdini Indie 20.0
Ubuntu 64GB Ryzen 16 core.
nVidia 3050RTX 8BG RAM.
 Report
User Avatar
papsphilip
Member
385 posts
Joined: 7月 2018
Offline
 
yeap! thank you vellum constraint properties did the trick. not sure why i couldn't get it to work with a geometry wrangle though
 Report
User Avatar
Yader
Member
33 posts
Joined: 2月 2016
Offline
 
The order of prims are changed when Vellum starts to solve. That's the reason why just copying the values over from Sops doesn't work. A custom prim index attribute could help identifying the correct pairs of constraint prims.
https://behance.net/derya [behance.net]
 Report
User Avatar
Yader
Member
33 posts
Joined: 2月 2016
Offline
 
Here's an enumerate to get the custom index attribute and the geo wrangle to get the mops mask affecting restlength:

Attachments:
houdini_vem84BNRPo.png (172.4 KB)
houdini_FWzAr5Dw9s.png (95.5 KB)
vellum_dyn_rest_yader.hiplc (545.5 KB)

https://behance.net/derya [behance.net]
 Report
User Avatar
papsphilip
Member
385 posts
Joined: 7月 2018
Offline
 
that makes sense! thanks a lot Yader
 Report
  • Quick Links