Density 700 kg/m³, friction 0.4, bounciness 0.3.
Density 1100 kg/m³, friction 0.8, bounciness 0.7.
Density 7800 kg/m³, friction 0.3, bounciness 0.2.
Density 900 kg/m³, friction 0.03, bounciness 0.1.
Density 1050 kg/m³, friction 0.35, bounciness 0.45.
Material with density, required for dynamic bodies where mass is computed from geometry.
Create a dense material.
Density is clamped to at least 1 kg/m³. Friction and bounciness are clamped to [0, 1].
Material with surface properties only — friction and bounciness, no density. Used for static bodies and point masses.
Material encodes friction, bounciness, and optionally density.
The type parameter tracks capabilities:
Material Dense— carries density (required for volumetric bodies)Material Surface— surface properties only (for static bodies and point masses)Friction controls how much a body resists sliding against another. 0 means frictionless (like ice), 1 means maximum grip (like rubber).
Bounciness (coefficient of restitution) controls how much kinetic energy is preserved after a collision. 0 means no bounce (the body absorbs the impact), 1 means a perfectly elastic bounce.
When two shapes collide, their friction values are combined using the geometric mean √(f1 · f2), so a slippery surface dominates. Bounciness uses the maximum of the two values, so the bouncier surface wins.