Examples of Manifold

org.jbox2d.collision.Manifold
A manifold for two touching convex shapes. Box2D supports multiple types of contact:
- clip point versus plane with radius
- point versus point with radius (circles)
The local point usage depends on the manifold type:
- e_circles: the local center of circleA
- e_faceA: the center of faceA
- e_faceB: the center of faceB
Similarly the local normal usage:
- e_circles: not used
- e_faceA: the normal on polygonA
- e_faceB: the normal on polygonB
We store contacts in this way so that position correction can account for movement, which is critical for continuous physics. All contact scenarios must be expressed in one of these types. This structure is stored across time steps, so we keep it small.

Examples of org.jbox2d.collision.Manifold

  protected Contact(IWorldPool argPool) {
    m_fixtureA = null;
    m_fixtureB = null;
    m_nodeA = new ContactEdge();
    m_nodeB = new ContactEdge();
    m_manifold = new Manifold();
    pool = argPool;
  }

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Examples of org.jbox2d.collision.Manifold

      final Shape shapeB = fixtureB.getShape();
      final float radiusA = shapeA.m_radius;
      final float radiusB = shapeB.m_radius;
      final Body bodyA = fixtureA.getBody();
      final Body bodyB = fixtureB.getBody();
      final Manifold manifold = contact.getManifold();


      int pointCount = manifold.pointCount;
      assert (pointCount > 0);


      ContactVelocityConstraint vc = m_velocityConstraints[i];

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Examples of org.jbox2d.collision.Manifold

      ContactVelocityConstraint vc = m_velocityConstraints[i];
      ContactPositionConstraint pc = m_positionConstraints[i];


      float radiusA = pc.radiusA;
      float radiusB = pc.radiusB;
      Manifold manifold = m_contacts[vc.contactIndex].getManifold();


      int indexA = vc.indexA;
      int indexB = vc.indexB;


      float mA = vc.invMassA;

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Examples of org.jbox2d.collision.Manifold

  }


  public void storeImpulses() {
    for (int i = 0; i < m_count; i++) {
      final ContactVelocityConstraint vc = m_velocityConstraints[i];
      final Manifold manifold = m_contacts[vc.contactIndex].getManifold();


      for (int j = 0; j < vc.pointCount; j++) {
        manifold.points[j].normalImpulse = vc.points[j].normalImpulse;
        manifold.points[j].tangentImpulse = vc.points[j].tangentImpulse;
      }

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Examples of org.jbox2d.collision.Manifold

  private final PointState[] state1 = new PointState[Settings.maxManifoldPoints];
  private final PointState[] state2 = new PointState[Settings.maxManifoldPoints];
  private final WorldManifold worldManifold = new WorldManifold();


  public void preSolve(Contact contact, Manifold oldManifold) {
    Manifold manifold = contact.getManifold();


    if (manifold.pointCount == 0) {
      return;
    }

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Examples of org.jbox2d.collision.Manifold

  protected Contact(IWorldPool argPool) {
    m_fixtureA = null;
    m_fixtureB = null;
    m_nodeA = new ContactEdge();
    m_nodeB = new ContactEdge();
    m_manifold = new Manifold();
    pool = argPool;
  }

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Examples of org.jbox2d.collision.Manifold

      final Shape shapeB = fixtureB.getShape();
      final float radiusA = shapeA.m_radius;
      final float radiusB = shapeB.m_radius;
      final Body bodyA = fixtureA.getBody();
      final Body bodyB = fixtureB.getBody();
      final Manifold manifold = contact.getManifold();


      int pointCount = manifold.pointCount;
      assert (pointCount > 0);


      ContactVelocityConstraint vc = m_velocityConstraints[i];

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Examples of org.jbox2d.collision.Manifold

      ContactVelocityConstraint vc = m_velocityConstraints[i];
      ContactPositionConstraint pc = m_positionConstraints[i];


      float radiusA = pc.radiusA;
      float radiusB = pc.radiusB;
      Manifold manifold = m_contacts[vc.contactIndex].getManifold();


      int indexA = vc.indexA;
      int indexB = vc.indexB;


      float mA = vc.invMassA;

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Examples of org.jbox2d.collision.Manifold

  }


  public void storeImpulses() {
    for (int i = 0; i < m_count; i++) {
      final ContactVelocityConstraint vc = m_velocityConstraints[i];
      final Manifold manifold = m_contacts[vc.contactIndex].getManifold();


      for (int j = 0; j < vc.pointCount; j++) {
        manifold.points[j].normalImpulse = vc.points[j].normalImpulse;
        manifold.points[j].tangentImpulse = vc.points[j].tangentImpulse;
      }

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Examples of org.jbox2d.collision.Manifold


import org.jbox2d.collision.Manifold;


public class TLManifold extends ThreadLocal<Manifold> {
  protected Manifold initialValue(){
    return new Manifold();
  }

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