Godot interaction system init

2026-08-17 20:06:51 +03:00
commit a86839c8cd
53 changed files with 2134 additions and 0 deletions
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+extends Interactable
+class_name Lever
+
+@export var body: RigidBody3D
+@export var hinge: HingeJoint3D
+
+@export var angleOn: float = -45.0
+@export var angleOff: float = 0.0
+
+@export var snapStrength: float = 200.0
+@export var maxGrabDistance: float = 4.0
+@export var mouseForce: float = 0.015
+
+var dragging := false
+var grabLocal := Vector3.ZERO
+var handOffset := Vector3.ZERO
+var targetAngle := 0.0
+
+func _ready():
+	hinge.set_param(HingeJoint3D.PARAM_LIMIT_LOWER, deg_to_rad(angleOn))
+	hinge.set_param(HingeJoint3D.PARAM_LIMIT_UPPER, deg_to_rad(angleOff))
+	targetAngle = angleOff
+
+
+func _physics_process(delta):
+	if dragging:
+		return
+
+	var angle = rad_to_deg(get_hinge_angle())
+
+	# Snap to nearest end
+	var mid = (angleOn + angleOff) * 0.5
+	if angle < mid:
+		targetAngle = angleOn
+	else:
+		targetAngle = angleOff
+
+	var angleError = deg_to_rad(targetAngle) - get_hinge_angle()
+
+	# HARD SNAP — no spring
+	var axis = hinge.global_transform.basis.x
+	var torque = snapStrength * sign(angleError)
+
+	body.apply_torque(axis * torque)
+
+
+func beginInteract(player, hitPosition: Vector3):
+	dragging = true
+	handOffset = Vector3.ZERO
+	grabLocal = body.to_local(hitPosition)
+
+
+func updateInteract(player):
+	if !dragging:
+		return
+
+	var worldGrab = body.to_global(grabLocal)
+
+	# Only vertical mouse movement (Y)
+	handOffset += -player.camera.global_basis.y * player.interactionMouseDelta.y * mouseForce
+	handOffset = handOffset.limit_length(0.25)
+
+	var targetHand = player.hand.global_position + handOffset
+	var error = targetHand - worldGrab
+
+	var handDistance = player.hand.global_position.distance_to(worldGrab)
+	if handDistance > maxGrabDistance:
+		endInteract(player)
+		player.dragging = false
+		return
+
+	var offset = worldGrab - body.global_position
+	var pointVelocity = body.linear_velocity + body.angular_velocity.cross(offset)
+
+	# Correct hinge axis (X)
+	var hingeAxis = body.global_basis.x
+	var tangent = hingeAxis.cross(offset)
+	if tangent.length_squared() < 0.0001:
+		return
+	tangent = tangent.normalized()
+
+	var tangentError = tangent * error.dot(tangent)
+	var tangentVelocity = tangent * pointVelocity.dot(tangent)
+
+	var force = tangentError * snapStrength
+	body.apply_force(force, offset)
+
+
+func endInteract(player):
+	dragging = false
+	handOffset = Vector3.ZERO
+
+
+func get_hinge_angle() -> float:
+	var body_basis = body.global_transform.basis
+	var hinge_basis = hinge.global_transform.basis
+
+	# X-axis rotation → use UP vector
+	var up = body_basis.y
+	var local_up = hinge_basis.inverse() * up
+
+	return atan2(local_up.z, local_up.y)
+
+
+func get_hinge_ang_vel() -> float:
+	var axis = hinge.global_transform.basis.x
+	return body.angular_velocity.dot(axis)