Level Editor Joint & Motor Physics Planner
Design reliable motors, swinging pendulums, hydraulic pistons, and spring suspension rigs without causing physics tunneling, game crashes, or joint separation glitches.
Connects two bodies at a shared pivot pin with optional rotational motor torque. Used for spinning sawblades, rotating windmills, pendulum traps, and wheel axles.
- Avoid setting motor torque above 100,000 N·m on light objects to prevent explosive numerical instability.
- Always set angular damping > 0.1 to avoid infinite harmonic resonance.
MOTOR STALL WARNING: Revolute Motor Joint (Pin Axis) cannot lift the 250kg payload on a 2.5m arm (demands 26444 N·m, motor caps at 3500 N·m). Increase motor torque to at least 7971 N·m.
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Frequently Asked Questions
What causes revolute motor joints to stall in the Happy Wheels Level Editor?
Motor stall occurs when the peak gravitational torque of the payload (tau = mass * 9.81 * arm_length) exceeds the maximum torque value set in the joint parameters. Always ensure available motor torque exceeds the peak gravity load by at least 25%.
How do I prevent objects tunneling through walls in custom levels?
Avoid setting motor speeds above 25 rad/s on long mechanical arms and ensure walls in launch paths are at least 1.5 to 2.0 meters thick. In Box2D, thin walls combined with fast motion can cause objects to skip collision detection between discrete frames.
What is the ideal damping ratio for suspension distance joints?
A damping ratio of 0.65 to 0.70 provides critical damping, absorbing bounce recoil cleanly without causing perpetual camera-shaking oscillations or sluggish joint response.