com.jme.math
Class SpringNode

java.lang.Object
  com.jme.math.SpringNode

public class SpringNode

extends java.lang.Object

SpringNode defines a single node in a SpringSystem.

Version:

$Id: SpringNode.java,v 1.1 2004/11/29 21:24:56 renanse Exp $

Author:

Joshua Slack

Field Summary

Vector3f	acceleration Acceleration vector, zeroed and recalculated on each SpringSystem.calcForces(float).
int	index index of this node in the system.
float	invMass Inverse Mass of this node.
float	mass Mass of this node.
Vector3f	normal Normal vector of this node in space.
Vector3f	oldPos Previous Position of this node in space.
Vector3f	position Position of this node in space.

Constructor Summary

SpringNode(Vector3f pos, Vector3f norm)
Public constructor.

Method Summary

void	setMass(float m) Set the mass for this node.
void	update(float dt) Verlet update of node location.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

index

public int index

index of this node in the system. Needs to be set by the programmer. can be useful for derivatives of SpringNodeForce that may apply force differently to different nodes based on location in the matrix.

mass

public float mass

Mass of this node.

invMass

public float invMass

Inverse Mass of this node.

position

public Vector3f position

Position of this node in space.

oldPos

public Vector3f oldPos

Previous Position of this node in space.

normal

public Vector3f normal

Normal vector of this node in space.

acceleration

public Vector3f acceleration

Acceleration vector, zeroed and recalculated on each SpringSystem.calcForces(float).

Constructor Detail

SpringNode

public SpringNode(Vector3f pos,
                  Vector3f norm)

Public constructor.

Parameters:

pos - Vertex position of this node.

norm - Vector describing node's normal.

Method Detail

setMass

public void setMass(float m)

Set the mass for this node. Also calculates and stores the inverse mass to invMass field for future use.

Parameters:

m - float

update

public void update(float dt)

Verlet update of node location. Pretty stable. Updates position by using implied velocity derived from the distance travled since last update. Thus velocity and position do not get out of sync.

Parameters:

dt - float - change in time since last update.