box2d::Manifold::Point Struct Reference

Point data for a manifold. More...

#include <Manifold.hpp>

Public Attributes
Length2D	localPoint
	Local point. More...
ContactFeature	contactFeature
	Contact feature. More...
Momentum	normalImpulse = 0
	Normal impulse. More...
Momentum	tangentImpulse = 0
	Tangent impulse. More...

Detailed Description

Point data for a manifold.

This is a contact point belonging to a contact manifold. It holds details related to the geometry and dynamics of the contact points.

Note

The impulses are used for internal caching and may not provide reliable contact forces especially for high speed collisions.

This structure is at least 20-bytes large.

Member Data Documentation

contactFeature

ContactFeature box2d::Manifold::Point::contactFeature

Contact feature.

Uniquely identifies a contact point between two shapes - A and B.

Note

This field is 4-bytes.

See also

GetPointStates.

localPoint

Length2D box2d::Manifold::Point::localPoint

Local point.

Usage depends on manifold type.

Note

For circles type manifolds, this is the local center of circle B.

For face-A type manifolds, this is the local center of "cirlce" B or a clip point of shape B. It is also the point at which impulse forces should be relatively applied for position resolution.

For face-B type manifolds, this is the local center of "circle" A or a clip point of shape A. It is also the point at which impulse forces should be relatively applied for position resolution.

8-bytes.

normalImpulse

Momentum box2d::Manifold::Point::normalImpulse = 0

Normal impulse.

This is the non-penetration impulse.

Note

This is only used for velocity constraint resolution.

4-bytes.

tangentImpulse

Momentum box2d::Manifold::Point::tangentImpulse = 0

Tangent impulse.

This is the friction impulse.

Note

This is only used for velocity constraint resolution.

4-bytes.

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The documentation for this struct was generated from the following file:

• Manifold.hpp