Add two-hand pickup and ability of switching hand while grabbing

[fangzhangmnm]

One might see my old Unity3D code

For two-handed weapons one might want to add the two-hand pickup ability
Also one might want to use another hand to grab the object while holding the object with one hand

[DigitalN8m4r3]

there is some work being done behind the curtain, an example of twohanded can be seen in my closed pr
#478

The collision hands are partially now part of the xr tools.
Feel free to look the things up and u are very welcome to implement your ideas and share them if u feel comfortable to do so.
After all the godot xr tools are heavily driven by the community

[DigitalN8m4r3]

on a furhter note, there is a simplified way to add twohanded just by editing one file
the interactable_handle.gd
https://github.com/DigitalN8m4r3/godot-xr-tools/blob/collision_hands_demo/addons/godot-xr-tools/interactables/interactable_handle.gd

@export_group("Optional attach Hand")
## this latches the grabbing Hand onto the Interactable
##
## Requirement: Collision Hands
# Additional Note: if export paths are not set, this will be ignored
# so make sure to setup the paths corresponding to hand
# Example: left_hand_position = LeftHandMarker3D
## Requirement: Collision Hands
@export var left_hand_position : Marker3D
## Requirement: Collision Hands
@export var right_hand_position : Marker3D

# Called when the handle is picked up
func pick_up(by, with_controller) -> void:
	# Call the base-class to perform the pickup
	super(by, with_controller)
	if left_hand_position:
		if with_controller.name.matchn("*left*"):
			left_hand_position.get_node("RemoteTransform3D").remote_path = self.by_hand.get_path()
		else:
			right_hand_position.get_node("RemoteTransform3D").remote_path = self.by_hand.get_path()
	# Enable the process function while held
	set_process(true)


# Called when the handle is dropped
func let_go(_p_linear_velocity: Vector3, _p_angular_velocity: Vector3) -> void:
	# Call the base-class to perform the drop, but with no velocity
	super(Vector3.ZERO, Vector3.ZERO)
	if left_hand_position:
		left_hand_position.get_node("RemoteTransform3D").remote_path = ""
		right_hand_position.get_node("RemoteTransform3D").remote_path = ""

	# Disable the process function as no-longer held
	set_process(false)

	# Snap the handle back to the origin
	transform = Transform3D.IDENTITY

granted there are some issues but this is the fastest and it works with the current xr tools

[Malcolmnixon]

#559 adds support for swapping items between hands.

[Malcolmnixon]

This now appears to be working quite well, and we're hoping to get a release out in the next few days.