Added gizmos to help align interactable joints

This PR resolves request GodotVR#584 by adding gizmos to align interactable hinges, sliders, and joysticks. This does cause minor breakage in that:
- New origin nodes have been introduced where the ranges are visualized
- Testing showed Y-Axis inversion on the slider and joystick

VERSIONS.md

@@ -1,3 +1,6 @@
+# 4.4.0
+- **minor-breakage** Add gizmos to help align interactable hinges, sliders, and joysticks
+
 # 4.3.0
 - Upgraded project to Godot 4.1 as the new minimum version.
 - Added reporting of stage load errors.

addons/godot-xr-tools/editor/gizmos/hinge_origin.gd

@@ -0,0 +1,172 @@
+extends EditorNode3DGizmoPlugin
+
+
+## Editor Gizmo for [XRToolsInteractableHingeOrigin]
+##
+## This editor gizmo helps align interactable hinge joints.
+
+
+var undo_redo : EditorUndoRedoManager
+
+
+func _init() -> void:
+	create_material("axis", Color(1, 1, 0))
+	create_material("extent", Color(1, 1, 0, 0.3), false, true)
+	create_handle_material("handles")
+
+
+func _get_gizmo_name() -> String:
+	return "InteractableHingeOrigin"
+
+
+func _get_handle_name(
+	p_gizmo : EditorNode3DGizmo,
+	p_handle_id : int,
+	_secondary : bool) -> String:
+	# Return minimum or maximum handle name
+	return "Minimum" if p_handle_id == 0 else "Maximum"
+
+
+func _get_handle_value(
+	p_gizmo : EditorNode3DGizmo,
+	p_handle_id : int,
+	_secondary : bool) -> Variant:
+	# Return limit
+	return _get_limit(p_gizmo.get_node_3d(), p_handle_id)
+
+
+func _set_handle(
+	p_gizmo : EditorNode3DGizmo,
+	p_handle_id : int,
+	_secondary : bool,
+	p_camera : Camera3D,
+	p_screen_pos : Vector2) -> void:
+	# Get the hinge origin node
+	var origin : XRToolsInteractableHingeOrigin = p_gizmo.get_node_3d()
+	var origin_pos := origin.global_position
+	var origin_dir := origin.global_transform.basis.x
+
+	# Construct the plane
+	var plane := Plane(origin_dir, origin_pos)
+
+	# Find the intersection between the ray and the plane
+	var v_intersect = plane.intersects_ray(
+		p_camera.global_position,
+		p_camera.project_ray_normal(p_screen_pos))
+	if not v_intersect:
+		return
+
+	# Find the local position and the delta in angle
+	var local := origin.to_local(v_intersect)
+	var old_local := _get_limit_pos(origin, p_handle_id)
+	var delta := rad_to_deg(old_local.signed_angle_to(local, Vector3.LEFT))
+
+	# Adjust the current limit
+	var limit := _get_limit(origin, p_handle_id)
+	limit = snappedf(limit + delta, 5)
+	_set_limit(origin, p_handle_id, limit)
+
+
+func _commit_handle(
+	p_gizmo : EditorNode3DGizmo,
+	p_handle_id : int,
+	_secondary : bool,
+	p_restore : Variant,
+	p_cancel : bool) -> void:
+	# Get the slider origin node
+	var origin : XRToolsInteractableHingeOrigin = p_gizmo.get_node_3d()
+
+	# If canceling then restore limit
+	if p_cancel:
+		_set_limit(origin, p_handle_id, p_restore)
+		return
+
+	# Commit the handle change
+	match p_handle_id:
+		0:
+			undo_redo.create_action("Set interactable hinge limit_minimum")
+			undo_redo.add_do_method(origin, "set_limit_minimum", origin.limit_minimum)
+			undo_redo.add_undo_method(origin, "set_limit_minimum", p_restore)
+			undo_redo.commit_action()
+		1:
+			undo_redo.create_action("Set interactable hinge limit_maximum")
+			undo_redo.add_do_method(origin, "set_limit_maximum", origin.limit_maximum)
+			undo_redo.add_undo_method(origin, "set_limit_maximum", p_restore)
+			undo_redo.commit_action()
+
+
+func _has_gizmo(node : Node3D) -> bool:
+	return node is XRToolsInteractableHingeOrigin
+
+
+func _redraw(gizmo : EditorNode3DGizmo) -> void:
+	# Clear the current gizmo contents
+	gizmo.clear()
+
+	# Get the hinge origin and its extents
+	var origin : XRToolsInteractableHingeOrigin = gizmo.get_node_3d()
+	var min_angle := deg_to_rad(origin.limit_minimum)
+	var max_angle := deg_to_rad(origin.limit_maximum)
+
+	# Draw the lines (for the axis)
+	var lines := PackedVector3Array()
+	lines.push_back(Vector3(-0.2, 0, 0))
+	lines.push_back(Vector3(0.2, 0, 0))
+	gizmo.add_lines(lines, get_material("axis", gizmo))
+
+	# Construct an immediate mesh for the extent
+	var mesh := ImmediateMesh.new()
+	mesh.surface_begin(Mesh.PRIMITIVE_TRIANGLE_STRIP)
+	var steps := int(abs(max_angle - min_angle) / 0.1)
+	for i in steps + 1:
+		if i != 0:
+			mesh.surface_add_vertex(Vector3.ZERO)
+		var angle := lerpf(min_angle, max_angle, i / float(steps))
+		mesh.surface_add_vertex(
+			Vector3(0, sin(angle) * 0.2, cos(angle) * 0.2))
+	mesh.surface_end()
+
+	# Draw the extent mesh
+	gizmo.add_mesh(mesh, get_material("extent", gizmo))
+
+	# Add the handles
+	var handles := PackedVector3Array()
+	handles.push_back(_get_limit_pos(origin, 0))
+	handles.push_back(_get_limit_pos(origin, 1))
+	gizmo.add_handles(handles, get_material("handles", gizmo), [])
+
+
+# Get the limit of a hinge by handle
+func _get_limit(
+	origin : XRToolsInteractableHingeOrigin,
+	p_handle_id : int) -> float:
+	# Read the limit
+	match p_handle_id:
+		0:
+			return origin.limit_minimum
+		1:
+			return origin.limit_maximum
+		_:
+			return 0.0
+
+
+# Get the limit position of a slider by handle
+func _get_limit_pos(
+	origin : XRToolsInteractableHingeOrigin,
+	p_handle_id : int) -> Vector3:
+	# Return the limit position
+	var angle := deg_to_rad(_get_limit(origin, p_handle_id))
+	return Vector3(0, sin(angle) * 0.2, cos(angle) * 0.2)
+
+
+# Set the limit of a hinge by handle
+func _set_limit(
+	origin : XRToolsInteractableHingeOrigin,
+	p_handle_id : int,
+	limit : float) -> void:
+	# Apply the limit
+	match p_handle_id:
+		0:
+			origin.limit_minimum = limit
+		1:
+			origin.limit_maximum = limit

addons/godot-xr-tools/editor/gizmos/joystick_origin.gd

@@ -0,0 +1,212 @@
+extends EditorNode3DGizmoPlugin
+
+
+## Editor Gizmo for [XRToolsInteractableJoystickOrigin]
+##
+## This editor gizmo helps align interactable joystick joints.
+
+
+var undo_redo : EditorUndoRedoManager
+
+
+func _init() -> void:
+	create_material("extent", Color(1, 1, 0, 0.3), false, true)
+	create_handle_material("handles")
+
+
+func _get_gizmo_name() -> String:
+	return "InteractableJoystickOrigin"
+
+
+func _get_handle_name(
+	p_gizmo : EditorNode3DGizmo,
+	p_handle_id : int,
+	_secondary : bool) -> String:
+	# Return handle name
+	if p_handle_id == 0: return "Minimum X"
+	if p_handle_id == 1: return "Maximum X"
+	if p_handle_id == 2: return "Minimum Y"
+	return "Maximum Y"
+
+
+func _get_handle_value(
+	p_gizmo : EditorNode3DGizmo,
+	p_handle_id : int,
+	_secondary : bool) -> Variant:
+	# Return limit
+	return _get_limit(p_gizmo.get_node_3d(), p_handle_id)
+
+
+func _set_handle(
+	p_gizmo : EditorNode3DGizmo,
+	p_handle_id : int,
+	_secondary : bool,
+	p_camera : Camera3D,
+	p_screen_pos : Vector2) -> void:
+	# Get the hinge origin node
+	var origin : XRToolsInteractableJoystickOrigin = p_gizmo.get_node_3d()
+	var origin_pos := origin.global_position
+	var origin_dir_x := origin.global_transform.basis.y
+	var origin_dir_y := -origin.global_transform.basis.x
+
+	# Construct the plane
+	var plane : Plane
+	if p_handle_id < 2:
+		plane = Plane(origin_dir_x, origin_pos)
+	else:
+		plane = Plane(origin_dir_y, origin_pos)
+
+	# Find the intersection between the ray and the plane
+	var v_intersect = plane.intersects_ray(
+		p_camera.global_position,
+		p_camera.project_ray_normal(p_screen_pos))
+	if not v_intersect:
+		return
+
+	# Find the local position
+	var local := origin.to_local(v_intersect)
+	var old_local := _get_limit_pos(origin, p_handle_id)
+	var delta : float
+	if p_handle_id < 2:
+		delta = rad_to_deg(old_local.signed_angle_to(local, Vector3.UP))
+	else:
+		delta = rad_to_deg(old_local.signed_angle_to(local, Vector3.LEFT))
+
+	# Adjust the current limit
+	var limit := _get_limit(origin, p_handle_id)
+	limit = snappedf(limit + delta, 5)
+	_set_limit(origin, p_handle_id, limit)
+
+
+func _commit_handle(
+	p_gizmo : EditorNode3DGizmo,
+	p_handle_id : int,
+	_secondary : bool,
+	p_restore : Variant,
+	p_cancel : bool) -> void:
+	# Get the slider origin node
+	var origin : XRToolsInteractableJoystickOrigin = p_gizmo.get_node_3d()
+
+	# If canceling then restore limit
+	if p_cancel:
+		_set_limit(origin, p_handle_id, p_restore)
+		return
+
+	# Commit the handle change
+	match p_handle_id:
+		0:
+			undo_redo.create_action("Set interactable joystick limit_x_minimum")
+			undo_redo.add_do_method(origin, "set_limit_x_minimum", origin.limit_x_minimum)
+			undo_redo.add_undo_method(origin, "set_limit_x_minimum", p_restore)
+			undo_redo.commit_action()
+		1:
+			undo_redo.create_action("Set interactable joystick limit_x_maximum")
+			undo_redo.add_do_method(origin, "set_limit_x_maximum", origin.limit_x_maximum)
+			undo_redo.add_undo_method(origin, "set_limit_x_maximum", p_restore)
+			undo_redo.commit_action()
+		2:
+			undo_redo.create_action("Set interactable joystick limit_y_minimum")
+			undo_redo.add_do_method(origin, "set_limit_y_minimum", origin.limit_y_minimum)
+			undo_redo.add_undo_method(origin, "set_limit_y_minimum", p_restore)
+			undo_redo.commit_action()
+		3:
+			undo_redo.create_action("Set interactable joystick limit_y_maximum")
+			undo_redo.add_do_method(origin, "set_limit_y_maximum", origin.limit_y_maximum)
+			undo_redo.add_undo_method(origin, "set_limit_y_maximum", p_restore)
+			undo_redo.commit_action()
+
+
+func _has_gizmo(node : Node3D) -> bool:
+	return node is XRToolsInteractableJoystickOrigin
+
+
+func _redraw(gizmo : EditorNode3DGizmo) -> void:
+	# Clear the current gizmo contents
+	gizmo.clear()
+
+	# Get the joystick origin and its extents
+	var origin : XRToolsInteractableJoystickOrigin = gizmo.get_node_3d()
+	var min_x_angle := deg_to_rad(origin.limit_x_minimum)
+	var max_x_angle := deg_to_rad(origin.limit_x_maximum)
+	var min_y_angle := deg_to_rad(origin.limit_y_minimum)
+	var max_y_angle := deg_to_rad(origin.limit_y_maximum)
+
+	# Construct an immediate mesh for the extent
+	var mesh := ImmediateMesh.new()
+	mesh.surface_begin(Mesh.PRIMITIVE_TRIANGLE_STRIP)
+	for i in 33:
+		if i != 0:
+			mesh.surface_add_vertex(Vector3.ZERO)
+		var angle := lerpf(min_x_angle, max_x_angle, i / 32.0)
+		mesh.surface_add_vertex(
+			Vector3(sin(angle) * 0.2, 0, cos(angle) * 0.2))
+	mesh.surface_end()
+	mesh.surface_begin(Mesh.PRIMITIVE_TRIANGLE_STRIP)
+	for i in 33:
+		if i != 0:
+			mesh.surface_add_vertex(Vector3.ZERO)
+		var angle := lerpf(min_y_angle, max_y_angle, i / 32.0)
+		mesh.surface_add_vertex(
+			Vector3(0, sin(angle) * 0.2, cos(angle) * 0.2))
+	mesh.surface_end()
+
+	# Draw the extent mesh
+	gizmo.add_mesh(mesh, get_material("extent", gizmo))
+
+	# Add the handles
+	var handles := PackedVector3Array()
+	handles.push_back(_get_limit_pos(origin, 0))
+	handles.push_back(_get_limit_pos(origin, 1))
+	handles.push_back(_get_limit_pos(origin, 2))
+	handles.push_back(_get_limit_pos(origin, 3))
+	gizmo.add_handles(handles, get_material("handles", gizmo), [])
+
+
+# Get the limit of a joystick by handle
+func _get_limit(
+	origin : XRToolsInteractableJoystickOrigin,
+	p_handle_id : int) -> float:
+	# Read the limit
+	match p_handle_id:
+		0:
+			return origin.limit_x_minimum
+		1:
+			return origin.limit_x_maximum
+		2:
+			return origin.limit_y_minimum
+		3:
+			return origin.limit_y_maximum
+		_:
+			return 0.0
+
+
+# Get the limit position of a slider by handle
+func _get_limit_pos(
+	origin : XRToolsInteractableJoystickOrigin,
+	p_handle_id : int) -> Vector3:
+	# Return the limit position
+	var angle := deg_to_rad(_get_limit(origin, p_handle_id))
+	match p_handle_id:
+		0, 1:
+			return Vector3(sin(angle) * 0.2, 0, cos(angle) * 0.2)
+		2, 3:
+			return Vector3(0, sin(angle) * 0.2, cos(angle) * 0.2)
+		_:
+			return Vector3.ZERO
+
+
+# Set the limit of a joystick by handle
+func _set_limit(
+	origin : XRToolsInteractableJoystickOrigin,
+	p_handle_id : int,
+	limit : float) -> void:
+	# Apply the limit
+	match p_handle_id:
+		0:
+			origin.limit_x_minimum = limit
+		1:
+			origin.limit_x_maximum = limit
+		2:
+			origin.limit_y_minimum = limit
+		3:
+			origin.limit_y_maximum = limit