How to change the rest position of a PinJoint2d

system · August 9, 2018, 2:12pm


	Reply From:	thomastc

I took a peek at the source code, assuming you are using Godot 3.

You want _configure_joint to be called, because it recreates the joint object in the physics server, which will use the current position of both bodies to determine the rest position.

_configure_point is called from _update_joint.

_update_joint gets called in several cases:

when node_a or node_b is changed
when NOTIFICATION_READY is received
when disable_collision is changed

The latter is probably the most robust way of doing this. Note that the value must actually change for it to work. So you can use this workaround:

pin_joint.disable_collision = !pin_joint.disable_collision
pin_joint.disable_collision = !pin_joint.disable_collision

Removing the node from the tree (remove_child) and adding it again (add_child) should also work, but it can mess with the ordering of nodes so it’s not entirely free of side effects.