Physics Simulation

Test your designs before printing. Drop parts, validate assemblies, check clearances—all with real-world physics powered by Rapier.

Simulation Controls

Play

Start simulation

Pause

Freeze physics

Reset

Return to initial positions

Fix selected object in space

Colliders

Show collision shapes

Speed

0.25x - 2x playback

Per-Object Physics

Every object can have its own physics properties. Make some parts heavy, others light. Pin reference objects in place. Control exactly how your simulation behaves.

Select any object to edit its properties
Steel density (7850 kg/m³) for realistic mass
Compound colliders for complex shapes
Timeline recording at 30 FPS

Mass Multiplier

Scale object weight (0.1x - 10x)

0.1 - 10

Linear Damping

How quickly movement slows

0 - 10

Angular Damping

How quickly rotation slows

0 - 10

Initial Spin

Starting angular velocity

-100 - 100

Gravity Toggle

Enable/disable per object

on/off

Collision Margin

Gap between surfaces

0.01 - 0.5

What can you simulate?

Assembly Validation

Drop parts together to verify they fit. Watch gears mesh, check snap-fit tolerances, validate that lid fits on box.

Center of Gravity

See where objects naturally settle. Great for designing stable stands, balanced holders, and self-righting parts.

Clearance Testing

Pin one part and move others around it. Check that moving parts don't collide, verify assembly sequences.

Drop Testing

Simulate what happens when parts are dropped. Will your phone stand tip over? Does the lid bounce off?

Timeline Scrubbing

The simulation records every frame at 30 FPS. Drag the timeline slider to scrub through the recording. Pause at any moment to inspect positions. Great for analyzing collision sequences or finding the exact moment parts interfere.

Duration

0:00 → 0:30

Frame Rate

30 FPS

Max Frames

900

3D View

Code Editor