Module com.github.stephengold.joltjni

Package com.github.stephengold.joltjni

Class HeightFieldShape

java.lang.Object

com.github.stephengold.joltjni.JoltPhysicsObject

com.github.stephengold.joltjni.NonCopyable

com.github.stephengold.joltjni.Shape

com.github.stephengold.joltjni.HeightFieldShape

All Implemented Interfaces:

ConstJoltPhysicsObject, ConstShape, RefTarget, AutoCloseable, Comparable<JoltPhysicsObject>

public class HeightFieldShape
extends Shape

A Shape to represent a surface defined by a matrix of heights.

Method Summary

Modifier and Type	Method	Description
int	getBlockSize()	Return the block size.
Vec3	getPosition(int x, int y)	Copy the location of specified sample.
Vec3	getSurfaceNormal(int subShapeId, Vec3Arg localLocation)	Calculate the normal to the surface at the specified surface location.
boolean	isNoCollision(int x, int y)	Test whether the shape has a hole at the specified sample.
boolean	projectOntoSurface(Vec3Arg localLocation, Vec3 storeSurfaceLocation, int[] storeSubShapeId)	Project the specified location along the Y axis to find a location on the surface.
void	setHeights(int startX, int startY, int sizeX, int sizeY, FloatBuffer heights, int stride, TempAllocator allocator)	Alter the heights for a rectangular sub-matrix.
void	setHeights(int startX, int startY, int sizeX, int sizeY, FloatBuffer heights, int stride, TempAllocator allocator, float cosThresholdAngle)	Alter the heights for a rectangular sub-matrix.

Methods inherited from class com.github.stephengold.joltjni.Shape

copyDebugTriangles, countDebugTriangles, draw, drawGetSupportFunction, getCenterOfMass, getInnerRadius, getLeafShape, getLocalBounds, getMassProperties, getMaterial, getRefCount, getRevisionCount, getStats, getSubShapeIdBitsRecursive, getSubType, getType, getWorldSpaceBounds, getWorldSpaceBounds, isValidScale, makeScaleValid, mustBeStatic, saveBinaryState, setEmbedded, sRestoreFromBinaryState, toRef, toRefC

Methods inherited from class com.github.stephengold.joltjni.JoltPhysicsObject

close, compareTo, equals, getContainingObject, hasAssignedNativeObject, hashCode, ownsNativeObject, setVirtualAddress, setVirtualAddress, startCleaner, targetVa, toString, va

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.lang.Comparable

compareTo

Methods inherited from interface com.github.stephengold.joltjni.readonly.ConstJoltPhysicsObject

close, hasAssignedNativeObject, ownsNativeObject, targetVa

Method Details

getBlockSize

public int getBlockSize()

Return the block size. The shape is unaffected.

Returns:

the number of height values in a block

getPosition

public Vec3 getPosition(int x,
 int y)

Copy the location of specified sample. The shape is unaffected.

Parameters:

x - the X coordinate of the sample (≥0, <sampleCount)

y - the Y coordinate of the sample (≥0, <sampleCount)

Returns:

a new location vector

getSurfaceNormal

public Vec3 getSurfaceNormal(int subShapeId,
 Vec3Arg localLocation)

Calculate the normal to the surface at the specified surface location.

Parameters:

subShapeId - which sub-shape to use

localLocation - the location relative to the shape's center of mass (not null, unaffected)

Returns:

a new direction vector

isNoCollision

public boolean isNoCollision(int x,
 int y)

Test whether the shape has a hole at the specified sample. The shape is unaffected.

Parameters:

x - the X coordinate of the sample (≥0, <sampleCount)

y - the Y coordinate of the sample (≥0, <sampleCount)

Returns:

true if there's a hole, otherwise false

projectOntoSurface

public boolean projectOntoSurface(Vec3Arg localLocation,
 Vec3 storeSurfaceLocation,
 int[] storeSubShapeId)

Project the specified location along the Y axis to find a location on the surface.

Parameters:

localLocation - the location relative to the shape's center of mass (not null, unaffected)

storeSurfaceLocation - storage for the surface location (not null, modified)

storeSubShapeId - storage for the sub-shape ID (not null, modified)

Returns:

true if a valid surface location was found, otherwise false

setHeights

public void setHeights(int startX,
 int startY,
 int sizeX,
 int sizeY,
 FloatBuffer heights,
 int stride,
 TempAllocator allocator)

Alter the heights for a rectangular sub-matrix.

Parameters:

startX - the index of the start row (multiple of the block size, ≥0, <sampleCount)

startY - the index of the start column (multiple of the block size, ≥0, <sampleCount)

sizeX - the number of affected rows (multiple of the block size, ≥0, ≤sampleCount-startX)

sizeY - the number of affected columns (multiple of the block size, ≥0, ≤sampleCount-startY)

heights - the height values to set

stride - stride between consecutive rows in heights (in floats)

allocator - for temporary allocations (not null)

setHeights

public void setHeights(int startX,
 int startY,
 int sizeX,
 int sizeY,
 FloatBuffer heights,
 int stride,
 TempAllocator allocator,
 float cosThresholdAngle)

Alter the heights for a rectangular sub-matrix.

Parameters:

startX - the index of the start row (multiple of the block size, ≥0, <sampleCount)

startY - the index of the start column (multiple of the block size, ≥0, <sampleCount)

sizeX - the number of affected rows (multiple of the block size, ≥0, ≤sampleCount-startX)

sizeY - the number of affected columns (multiple of the block size, ≥0, ≤sampleCount-startY)

heights - the height values to set

stride - stride between consecutive rows in heights (in floats)

allocator - for temporary allocations (not null)

cosThresholdAngle - cosine of the threshold angle (default=0.996195)