Package org.jbox2d.collision
Class ManifoldPoint
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- org.jbox2d.collision.ManifoldPoint
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public class ManifoldPoint extends java.lang.Object
A manifold point is a contact point belonging to a contact manifold. It holds details related to the geometry and dynamics of the contact points. The local point usage depends on the manifold type:- e_circles: the local center of circleB
- e_faceA: the local center of cirlceB or the clip point of polygonB
- e_faceB: the clip point of polygonA
Note: the impulses are used for internal caching and may not provide reliable contact forces, especially for high speed collisions.
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Field Summary
Fields Modifier and Type Field Description ContactID
id
uniquely identifies a contact point between two shapesVec2
localPoint
usage depends on manifold typefloat
normalImpulse
the non-penetration impulsefloat
tangentImpulse
the friction impulse
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Constructor Summary
Constructors Constructor Description ManifoldPoint()
Blank manifold point with everything zeroed out.ManifoldPoint(ManifoldPoint cp)
Creates a manifold point as a copy of the given point
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description void
set(ManifoldPoint cp)
Sets this manifold point form the given one
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Field Detail
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localPoint
public final Vec2 localPoint
usage depends on manifold type
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normalImpulse
public float normalImpulse
the non-penetration impulse
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tangentImpulse
public float tangentImpulse
the friction impulse
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id
public final ContactID id
uniquely identifies a contact point between two shapes
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Constructor Detail
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ManifoldPoint
public ManifoldPoint()
Blank manifold point with everything zeroed out.
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ManifoldPoint
public ManifoldPoint(ManifoldPoint cp)
Creates a manifold point as a copy of the given point- Parameters:
cp
- point to copy from
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Method Detail
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set
public void set(ManifoldPoint cp)
Sets this manifold point form the given one- Parameters:
cp
- the point to copy from
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