Jump to content
diogomgf

Vellum constraint overlaping properties

Recommended Posts

While setting up vellum constraints, I used the preset: "configure balloon".
It created both vellum constraints: cloth and pressure, with both nodes sharing the same "stretch" properties.
After some testing, I realized that both "Stifness" and "Damping Ratio" could be set to 0 within the cloth constraint, as long as the pressure constraint had non-zero values on both parameters and things would be exactly the same.
But on the other hand, if I tweaked the "Rest Length Scale" and "Compression Stiffness" parameters on the cloth constraint, this would have an impact.

Why do some values on the cloth constraint are overriden by the pressure constraint (wich comes right after the cloth) and others aren't?

Cheers,
Diogo

Capture.JPG

Share this post


Link to post
Share on other sites

I don't believe they are being overridden as they are setting values to completely different primitives, do you have a hip file?

Share this post


Link to post
Share on other sites
13 hours ago, anim said:

I don't believe they are being overridden as they are setting values to completely different primitives, do you have a hip file?

Here it is.

debug_vellum.hip

Share this post


Link to post
Share on other sites

it's your vellumconstraintproperty1 nodeinside of the Vellum Solver which is controlling every constraint's stiffness so it is essentially overwriting the sop level values

you may want to just limit it to pressure constraints if that is your intention

so on vellumconstraints2 specify output group: pressure

and on vellumconstraintproperty1 just use that group

Edited by anim
  • Like 1

Share this post


Link to post
Share on other sites

Ok, that clears it up for me! Thank you
 

Edited by diogomgf

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

×