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use serde::{Deserialize, Serialize};
#[derive(Debug, Clone, Copy, PartialEq, Serialize, Deserialize)]
pub struct PhysicsMaterial {
/// General friction coefficient for sliding (0.0 = frictionless, 1.0 = highly resistive)
pub friction: f32,
/// Bounciness (0.0 = no bounce, 1.0 = perfect elastic collision)
pub restitution: f32,
/// Multiplier for tire grip. Ice would be ~0.1, Asphalt ~1.0
pub grip_multiplier: f32,
/// Multiplier for rolling resistance and linear drag. Mud/Sand would be > 1.0
pub drag_multiplier: f32,
}
impl Default for PhysicsMaterial {
fn default() -> Self {
Self {
friction: 0.8,
restitution: 0.1,
grip_multiplier: 1.0,
drag_multiplier: 1.0,
}
}
}
impl PhysicsMaterial {
pub fn ice() -> Self {
Self {
friction: 0.05,
restitution: 0.0,
grip_multiplier: 0.05,
drag_multiplier: 0.2, // Slides easily
}
}
pub fn mud() -> Self {
Self {
friction: 0.5,
restitution: 0.0,
grip_multiplier: 0.5,
drag_multiplier: 5.0, // High drag (slows down cars rapidly)
}
}
pub fn asphalt() -> Self {
Self::default()
}
}
gizmo_core::impl_component!(PhysicsMaterial);