public class MidpointDisplacementHeightMap extends AbstractHeightMap
MidpointDisplacementHeightMap generates a heightmap based on
the midpoint displacement algorithm. See Constructor javadoc for more info.filter, heightData, heightScale, NORMALIZE_RANGE, size| Constructor and Description |
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MidpointDisplacementHeightMap(int size,
float range,
float persistence)
The constructor generates the heightmap.
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MidpointDisplacementHeightMap(int size,
float range,
float persistence,
long seed)
The constructor generates the heightmap.
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| Modifier and Type | Method and Description |
|---|---|
protected int[] |
doDiamondStep(float[][] tempBuffer,
int[] coords,
int stepSize,
float offsetRange,
java.util.Random random)
Will fill the cell at (x+stepSize/2, y) with the average of the 4 corners
of the diamond centered on that point with width and height of stepSize.
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protected int[] |
doSquareStep(float[][] tempBuffer,
int[] coords,
int stepSize,
float offsetRange,
java.util.Random random)
Will fill the value at (coords[0]+stepSize/2, coords[1]+stepSize/2) with
the average from the corners of the square with top, left corner at (coords[0],coords[1])
and width of stepSize.
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protected float |
getOffset(java.util.Random random,
float offsetRange,
int[] coords,
float average)
Generate a random value to add to the computed average
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float |
getPersistence() |
float |
getRange() |
long |
getSeed() |
boolean |
load()
Generate the heightmap.
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void |
setPersistence(float persistence) |
void |
setRange(float range) |
void |
setSeed(long seed) |
erodeTerrain, findMinMaxHeights, flatten, getHeightMap, getInterpolatedHeight, getScaledHeightAtPoint, getScaledHeightMap, getSize, getTrueHeightAtPoint, normalizeTerrain, save, setHeightAtPoint, setHeightScale, setMagnificationFilter, setSize, smooth, smooth, unloadHeightMappublic MidpointDisplacementHeightMap(int size,
float range,
float persistence,
long seed)
-range
and range. The range parameter is multiplied by
the persistence parameter each pass to smoothen close cell heights.
Extends this class and override the getOffset function for more control of
the randomness (you can use the coordinates and/or the computed average height
to influence the random amount added.size - The size of the heightmap, must be 2^N+1range - The range in which randomness will be added. A value of 1 will
allow -1 to 1 value changes.persistence - The factor by which the range will evolve at each iteration.
A value of 0.5f will halve the range at each iteration and is
typically a good choiceseed - A seed to feed the random number generator.java.lang.IllegalArgumentException - if size is not a power of two plus one.public MidpointDisplacementHeightMap(int size,
float range,
float persistence)
throws java.lang.Exception
-range
and range. The range parameter is multiplied by
the persistence parameter each pass to smoothen close cell heights.size - The size of the heightmap, must be 2^N+1range - The range in which randomness will be added. A value of 1 will
allow -1 to 1 value changes.persistence - The factor by which the range will evolve at each iteration.
A value of 0.5f will halve the range at each iteration and is
typically a good choiceJMException - if size is not a power of two plus one.java.lang.Exceptionpublic boolean load()
protected int[] doSquareStep(float[][] tempBuffer,
int[] coords,
int stepSize,
float offsetRange,
java.util.Random random)
tempBuffer - the temporary heightmapcoords - an int array of length 2 with the x coord in position 0stepSize - the size of the squareoffsetRange - the offset range within a random value is picked and added to the averagerandom - the random generatorprotected int[] doDiamondStep(float[][] tempBuffer,
int[] coords,
int stepSize,
float offsetRange,
java.util.Random random)
tempBuffer - coords - stepSize - offsetRange - random - protected float getOffset(java.util.Random random,
float offsetRange,
int[] coords,
float average)
random - the random generatoroffsetRange - coords - average - public float getPersistence()
public void setPersistence(float persistence)
public float getRange()
public void setRange(float range)
public long getSeed()
public void setSeed(long seed)