Package com.jme3.terrain.heightmap

Class ParticleDepositionHeightMap

java.lang.Object

com.jme3.terrain.heightmap.AbstractHeightMap

com.jme3.terrain.heightmap.ParticleDepositionHeightMap

All Implemented Interfaces:

HeightMap

public class ParticleDepositionHeightMap
extends AbstractHeightMap

ParticleDepositionHeightMap creates a heightmap based on the Particle Deposition algorithm based on Jason Shankel's paper from "Game Programming Gems". A heightmap is created using a Molecular beam epitaxy, or MBE, for depositing thin layers of atoms on a substrate. We drop a sequence of particles and simulate their flow across a surface of previously dropped particles. This creates a few high peaks, for further realism we can define a caldera. Similar to the way volcano's form islands, rock is deposited via lava, when the lava cools, it recedes into the volcano, creating the caldera.

Field Summary

Fields inherited from class com.jme3.terrain.heightmap.AbstractHeightMap

filter, heightData, heightScale, NORMALIZE_RANGE, size

Constructor Summary

Constructors

Constructor	Description
ParticleDepositionHeightMap(int size, int jumps, int peakWalk, int minParticles, int maxParticles, float caldera)	Constructor sets the attributes of the Particle Deposition Height Map and then generates the map.

Method Summary

Modifier and Type	Method	Description
boolean	load()	load generates the heightfield using the Particle Deposition algorithm.
void	setCaldera(float caldera)	setCaldera sets the level at which a peak will be inverted.
void	setJumps(int jumps)	setJumps sets the number of jumps or peaks that will be created during the next call to load.
void	setMaxParticles(int maxParticles)	setMaxParticles sets the maximum number of particles for a single jump.
void	setMinParticles(int minParticles)	setMinParticles sets the minimum number of particles for a single jump.
void	setPeakWalk(int peakWalk)	setPeakWalk sets how often the jump point will be agitated.

Methods inherited from class com.jme3.terrain.heightmap.AbstractHeightMap

erodeTerrain, findMinMaxHeights, flatten, getHeightMap, getInterpolatedHeight, getScaledHeightAtPoint, getScaledHeightMap, getSize, getTrueHeightAtPoint, normalizeTerrain, save, setHeightAtPoint, setHeightScale, setMagnificationFilter, setSize, smooth, smooth, unloadHeightMap

Methods inherited from class java.lang.Object

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

Constructor Details

ParticleDepositionHeightMap

public ParticleDepositionHeightMap(int size,
 int jumps,
 int peakWalk,
 int minParticles,
 int maxParticles,
 float caldera)
                            throws Exception

Constructor sets the attributes of the Particle Deposition Height Map and then generates the map.

Parameters:

size - the size of the terrain where the area is size x size.

jumps - number of areas to drop particles. Can also think of it as the number of peaks.

peakWalk - determines how much to agitate the drop point during a creation of a single peak. The lower the number the more the drop point will be agitated. 1 will insure agitation every round.

minParticles - defines the minimum number of particles to drop during a single jump.

maxParticles - defines the maximum number of particles to drop during a single jump.

caldera - defines the altitude to invert a peak. This is represented as a percentage, where 0.0 will not invert anything, and 1.0 will invert all.

Throws:

Exception - if any value is less than zero, and if caldera is not between 0 and 1. If minParticles is greater than max particles as well.

Method Details

load

public boolean load()

load generates the heightfield using the Particle Deposition algorithm. load uses the latest attributes, so a call to load is recommended if attributes have changed using the set methods.

Returns:

true if the load was successful, false otherwise.

setJumps

public void setJumps(int jumps)
              throws Exception

setJumps sets the number of jumps or peaks that will be created during the next call to load.

Parameters:

jumps - the number of jumps to use for next load.

Throws:

Exception - if jumps is less than zero.

setPeakWalk

public void setPeakWalk(int peakWalk)
                 throws Exception

setPeakWalk sets how often the jump point will be agitated. The lower the peakWalk, the more often the point will be agitated.

Parameters:

peakWalk - the amount to agitate the jump point.

Throws:

Exception - if peakWalk is negative or zero.

setCaldera

public void setCaldera(float caldera)
                throws Exception

setCaldera sets the level at which a peak will be inverted.

Parameters:

caldera - the level at which a peak will be inverted. This must be between 0 and 1, as it is represented as a percentage.

Throws:

Exception - if caldera is not between 0 and 1.

setMaxParticles

public void setMaxParticles(int maxParticles)

setMaxParticles sets the maximum number of particles for a single jump.

Parameters:

maxParticles - the maximum number of particles for a single jump.

setMinParticles

public void setMinParticles(int minParticles)
                     throws Exception

setMinParticles sets the minimum number of particles for a single jump.

Parameters:

minParticles - the minimum number of particles for a single jump.

Throws:

Exception - if minParticles are greater than the current maxParticles;