Stiffness option for springs in Jolt joints

[phelioz]

It would be great to be able to use stiffness or frequency for springs in the Jolt joints. While you can just use the regular joints if you want to use stiffness, these don't allow for breakable joints because you can't access the applied force / torque.

The frequency setting for springs in Jolt joints is fantastic for many situations, providing a specific type of behavior that works independently of mass.

However, stiffness becomes incredibly useful when simulating a certain kind of strength. By adjusting stiffness, you can effectively set a 'strength' level. This feature is particularly valuable when simulating something like a character's muscle strength or the lifting capability of a machine.

[mihe]

Yeah, this is something I've been thinking about for a while now as well. I think it's a good idea, and would probably be trivial to add. I just need to figure out some way of dynamically switching out the property fields based on which mode you set, but I've seen other nodes do that, so it shouldn't be too difficult.

[phelioz]

Object::_validate_property(PropertyInfo &p_property) and Object::notify_property_list_changed would probably be enough for dynamically switching out the property fields I think.

Like for example in the Control class where some properties change depending on what the parent is.

[mihe]

That's pretty slick. CSGPolygon3D seems to rely on exactly that as well, for when you enable/disable collision on it.

I need to finish up soft bodies first, so it might be a little while before I get to this.

[phelioz]

Yeah CSGPolygon3D was a better example 😄

No stress, nice to know it's planned.