cs5643.particles

Class ParticleSystem

java.lang.Object

cs5643.particles.ParticleSystem

public class ParticleSystem
extends java.lang.Object

Maintains dynamic lists of Particle and Force objects, and provides access to their state for numerical integration of dynamics.

Field Summary

Fields

Modifier and Type	Field and Description
java.util.ArrayList<Force>	F List of Force objects.
static java.lang.String[]	FRAG_SOURCE Filename of fragment shader source.
java.util.ArrayList<Particle>	P List of Particle objects.
double	time Current simulation time.
static java.lang.String[]	VERT_SOURCE Filename of vertex shader source.

Constructor Summary

Constructors

Constructor and Description
ParticleSystem() Basic constructor.

Method Summary

Methods

Modifier and Type	Method and Description
void	addForce(Force f) Adds a force object (until removed)
void	advanceTime(double dt) Incomplete/Debugging implementation of Forward-Euler step.
Particle	createParticle(javax.vecmath.Point3d p0) Creates particle and adds it to the particle system.
void	display(GL2 gl) Displays Particle and Force objects.
Particle	getNearestParticle(javax.vecmath.Point3d x) Helper-function that computes nearest particle to the specified (deformed) position.
void	init(GL2 gl) Set up the GLSL program.
void	removeForce(Force f) Useful for removing temporary forces, such as user-interaction spring forces.
void	reset() Moves all particles to undeformed/materials positions, and sets all velocities to zero.

Methods inherited from class java.lang.Object

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

Field Detail

time

public double time

Current simulation time.

P

public java.util.ArrayList<Particle> P

List of Particle objects.

F

public java.util.ArrayList<Force> F

List of Force objects.

VERT_SOURCE

public static final java.lang.String[] VERT_SOURCE

Filename of vertex shader source.

FRAG_SOURCE

public static final java.lang.String[] FRAG_SOURCE

Filename of fragment shader source.

Constructor Detail

ParticleSystem

public ParticleSystem()

Basic constructor.

Method Detail

init

public void init(GL2 gl)

Set up the GLSL program. This requires that the current directory (i.e. the package in which this class resides) has a vertex and fragment shader.

addForce

public void addForce(Force f)

Adds a force object (until removed)

removeForce

public void removeForce(Force f)

Useful for removing temporary forces, such as user-interaction spring forces.

createParticle

public Particle createParticle(javax.vecmath.Point3d p0)

Creates particle and adds it to the particle system.

Parameters:

p0 - Undeformed/material position.

Returns:

Reference to new Particle.

getNearestParticle

public Particle getNearestParticle(javax.vecmath.Point3d x)

Helper-function that computes nearest particle to the specified (deformed) position.

Returns:

Nearest particle, or null if no particles.

reset

public void reset()

Moves all particles to undeformed/materials positions, and sets all velocities to zero. Synchronized to avoid problems with simultaneous calls to advanceTime().

advanceTime

public void advanceTime(double dt)

Incomplete/Debugging implementation of Forward-Euler step. WARNING: Contains buggy debugging forces.

display

public void display(GL2 gl)

Displays Particle and Force objects.