Physics Friction

App: apps/physics_friction/

Shows how Jolt’s friction coefficient affects dynamic rigid bodies on an inclined ramp. Boxes with different friction settings are placed at the top; R resets them to their starting positions.

Run from root

% ./plume3d physics_friction

What it does

• Loads Models/FrictionDemo.blend and instantiates GameCamera, GameLight, Environment (inclined ramp, static), and boxes with varying friction values (e.g. Box_Low, Box_Med, Box_High).
• Tracks each box node and its initial position for resetting.
• R — resets all boxes: node.setPosition, Physics.setLinearVelocity(..., 0,0,0), Physics.setAngularVelocity(..., 0,0,0), Physics.activate.
• Shadow mapping enabled: light.castsShadows = true, Graphics.setShadowMappingEnabled(true).

Reset pattern

if (Input.keyJustPressed("r")) {
    for (i in 0..._boxes.count) {
        var box = _boxes[i]
        var pos = _initialPositions[i]
        box.setPosition(pos[0], pos[1], pos[2])
        Physics.setLinearVelocity(box, 0, 0, 0)
        Physics.setAngularVelocity(box, 0, 0, 0)
        Physics.activate(box)
    }
}

Blend setup

Create Models/FrictionDemo.blend in Blender with the Plume3D addon:

Object	Description	Rigid Body
Ramp plane	Inclined static surface	Passive, Box, layer Ramp
Box_Low	Low friction (e.g. 0.1)	Active, Box, layer Boxes
Box_Med	Medium friction (e.g. 0.5)	Active, Box, layer Boxes
Box_High	High friction (e.g. 0.9)	Active, Box, layer Boxes
Camera	GameCamera	—
Light	GameLight	—

Set friction on each box via Blender’s Rigid Body > Surface Response panel.

APIs

• Physics — setLinearVelocity, setAngularVelocity, activate.
• Resource — loadBlend.
• Graphics — setLights, setShadowMappingEnabled.
• Light — castsShadows.