Vellum, PBDs or....

[Zetha]

Hello

I was trying to make hanging chains and textile  simulations, like the images.

I have  found multiple ways using PBD, Vellum, as well as people speaking about using FEM.

What aproach would you suggest for these type of simulations?

 

[konstantin magnus]

For static models I mostly just fake gravity based on curve lengths or surface distances:

https://procegen.konstantinmagnus.de/spider-web
https://procegen.konstantinmagnus.de/minimal-surface-membrane 

Eg. for resampled curve segments on a spider web, a is the user defined hanging amount, u the relative and r the absolute length.
u * (1.0 - u) is a function to make the curves hang in their center.

float a = chf('amount');
float u = vertexcurveparam(0, i@vtxnum);
float r = primintrinsic(0, 'measuredperimeter', i@primnum);

v@P.y -= u * (1.0 - u) * a * r;

 

spiderweb.hipnc

[Zetha]

Thanks, that looks nice.

But if you want to make a simulation, what would be the way?

[Librarian]

@Zetha for the Chains .
 

wiresolver.hiplc

[konstantin magnus]

5 hours ago, Zetha said:

But if you want to make a simulation

To animate the spider web threads, you would pin the end points and set vellum to the constraint type 'string'. For membranes to 'cloth'.

spiderweb.hipnc

[Zetha]

Thank you very much

I guess PBD would be an old method or less effective?