41 lines
1.4 KiB
Rust
41 lines
1.4 KiB
Rust
use crate::math::Real;
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/// Rules used to combine two coefficients.
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///
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/// This is used to determine the effective restitution and
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/// friction coefficients for a contact between two colliders.
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/// Each collider has its combination rule of type
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/// `CoefficientCombineRule`. And the rule
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/// actually used is given by `max(first_combine_rule as usize, second_combine_rule as usize)`.
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#[derive(Default, Copy, Clone, Debug, PartialEq, Eq, PartialOrd, Ord)]
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#[cfg_attr(feature = "serde-serialize", derive(Serialize, Deserialize))]
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pub enum CoefficientCombineRule {
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/// The two coefficients are averaged.
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#[default]
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Average = 0,
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/// The smallest coefficient is chosen.
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Min = 1,
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/// The two coefficients are multiplied.
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Multiply = 2,
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/// The greatest coefficient is chosen.
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Max = 3,
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}
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impl CoefficientCombineRule {
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pub(crate) fn combine(
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coeff1: Real,
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coeff2: Real,
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rule_value1: CoefficientCombineRule,
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rule_value2: CoefficientCombineRule,
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) -> Real {
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let effective_rule = rule_value1.max(rule_value2);
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match effective_rule {
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CoefficientCombineRule::Average => (coeff1 + coeff2) / 2.0,
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CoefficientCombineRule::Min => coeff1.min(coeff2),
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CoefficientCombineRule::Multiply => coeff1 * coeff2,
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CoefficientCombineRule::Max => coeff1.max(coeff2),
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}
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}
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}
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