2ca67bb28b
Playable table (hinge-motor flippers, plunger, bumper, drain) plus a headless probe harness that measured, per engine: tunneling of a fast ball through a 1 cm wall with CCD off/on, and hinge-motor drive. Findings in godot/README.md: Box3D never tunnels even with CCD off, but its hinge motor sign is inverted vs Jolt/GodotPhysics, and Jolt blows through angular limits that Box3D holds. Ships a from-source macOS arm64 libgodot-box3d.dylib (upstream has no releases). Also gitignore the remaining Microsoft media at repo root. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
73 lines
2.6 KiB
GDScript
73 lines
2.6 KiB
GDScript
extends Node3D
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## Playable Box3D/Jolt/GodotPhysics pinball testbed.
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## Z = left flipper, / = right flipper, Space = plunger, R = reset ball.
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const FLIP_SPEED := 25.0
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const REST_SPEED := 8.0
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const PLUNGE_IMPULSE := 0.32 # ~4 m/s on the 80 g ball
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const BUMPER_IMPULSE := 0.12
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@onready var ball: RigidBody3D = $Ball
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@onready var left_joint: HingeJoint3D = $LeftFlipperJoint
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@onready var right_joint: HingeJoint3D = $RightFlipperJoint
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var _ball_start: Transform3D
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func _ready() -> void:
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_ball_start = ball.transform
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print("physics engine: ", ProjectSettings.get_setting("physics/3d/physics_engine"))
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$Drain.body_entered.connect(_on_drain)
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$BumperArea.body_entered.connect(_on_bumper)
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if OS.get_environment("PINBALL_AUTOTEST") == "1":
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_autotest()
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## Headless check that the real table flippers flip: hold both motors at flip
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## speed for half a second and report how far each flipper swung.
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func _autotest() -> void:
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set_physics_process(false)
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var lf: RigidBody3D = $LeftFlipper
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var rf: RigidBody3D = $RightFlipper
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var l0 := lf.rotation.y
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var r0 := rf.rotation.y
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left_joint.set_param(HingeJoint3D.PARAM_MOTOR_TARGET_VELOCITY, FLIP_SPEED)
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right_joint.set_param(HingeJoint3D.PARAM_MOTOR_TARGET_VELOCITY, -FLIP_SPEED)
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for i in 30:
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await get_tree().physics_frame
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print("AUTOTEST left_swing_deg=%.1f right_swing_deg=%.1f" % [
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rad_to_deg(angle_difference(l0, lf.rotation.y)),
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rad_to_deg(angle_difference(r0, rf.rotation.y))])
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get_tree().quit(0)
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func _physics_process(_delta: float) -> void:
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var left := Input.is_physical_key_pressed(KEY_Z)
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var right := Input.is_physical_key_pressed(KEY_SLASH)
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left_joint.set_param(HingeJoint3D.PARAM_MOTOR_TARGET_VELOCITY, FLIP_SPEED if left else -REST_SPEED)
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right_joint.set_param(HingeJoint3D.PARAM_MOTOR_TARGET_VELOCITY, -FLIP_SPEED if right else REST_SPEED)
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if Input.is_physical_key_pressed(KEY_SPACE) and _ball_in_lane():
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ball.apply_central_impulse(Vector3(0, 0, -PLUNGE_IMPULSE))
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if Input.is_physical_key_pressed(KEY_R):
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_reset_ball()
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func _ball_in_lane() -> bool:
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return ball.position.x > 0.21 and ball.position.z > 0.30 \
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and ball.linear_velocity.length() < 0.05
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func _on_drain(body: Node3D) -> void:
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if body == ball:
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_reset_ball.call_deferred()
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func _on_bumper(body: Node3D) -> void:
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if body != ball:
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return
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var bumper: StaticBody3D = $Bumper
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var dir := ball.global_position - bumper.global_position
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dir.y = 0.0
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if dir.length() < 0.001:
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dir = Vector3(0, 0, 1)
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ball.apply_central_impulse(dir.normalized() * BUMPER_IMPULSE)
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func _reset_ball() -> void:
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ball.linear_velocity = Vector3.ZERO
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ball.angular_velocity = Vector3.ZERO
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ball.transform = _ball_start
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