Real-Time Physics Simulation Forum

Re: Inequality Constraint in PBD

2014-09-25T08:35:19+00:00

If your state is within the valid region: the constraint isn't violated, you don't have to do anything.
If your state is outside the valid region: find the point on the surface of the valid region closest to the current state, this is your target state.

So, for a min/max distance constraint:

if(current_distance < min_distance): project to min
if(current_distance > max_distance): project to max
else: do nothing

("project to X" means "solve distance constraint using X as the desired/target/rest distance")

Statistics: Posted by raigan2 — Thu Sep 25, 2014 8:35 am

Re: Inequality Constraint in PBD

2014-09-22T22:57:11+00:00

Conceptually very much like equality constraints. It depends on the type

Statistics: Posted by Dirk Gregorius — Mon Sep 22, 2014 10:57 pm

Re: Inequality Constraint in PBD

2014-09-22T22:04:55+00:00

You simply skip over the constraint if the inequality is satisfied.

Then, if the inequality constraint is not satisfied, how to solve the constraint?

Statistics: Posted by apapaxionga — Mon Sep 22, 2014 10:04 pm

Re: Inequality Constraint in PBD

2014-09-22T17:21:07+00:00

You simply skip over the constraint if the inequality is satisfied.

Statistics: Posted by Dirk Gregorius — Mon Sep 22, 2014 5:21 pm

Inequality Constraint in PBD

2014-09-20T23:46:39+00:00

In position based dynamic, equality constraint such as distant constraint can be solved using constraint projection method. However, in paper related to PBD, how to solve inequality constraint are not mentioned a lot. How to solve the inequality constraint in the PBD framework ?

Statistics: Posted by apapaxionga — Sat Sep 20, 2014 11:46 pm