com.jme3.bullet.collision.shapes

Class SimplexCollisionShape

java.lang.Object

com.jme3.bullet.NativePhysicsObject

com.jme3.bullet.collision.shapes.CollisionShape

com.jme3.bullet.collision.shapes.ConvexShape

com.jme3.bullet.collision.shapes.SimplexCollisionShape

All Implemented Interfaces:

java.lang.Comparable<NativePhysicsObject>

public class SimplexCollisionShape
extends ConvexShape

A simple point, line-segment, triangle, or tetrahedron collision shape based on Bullet's btBU_Simplex1to4. These shapes cannot be scaled.

Field Summary

Fields

Modifier and Type	Field and Description
static java.util.logging.Logger	logger2 message logger for this class

Fields inherited from class com.jme3.bullet.collision.shapes.ConvexShape

loggerX

Fields inherited from class com.jme3.bullet.collision.shapes.CollisionShape

enableContactFilter, logger, margin, scale

Fields inherited from class com.jme3.bullet.NativePhysicsObject

loggerN

Constructor Summary

Constructors

Constructor and Description
SimplexCollisionShape(java.nio.FloatBuffer buffer, int startPosition, int endPosition) Instantiate a simplex shape based on the specified FloatBuffer range.
SimplexCollisionShape(Vector3f location) Instantiate a point shape based on the specified location.
SimplexCollisionShape(Vector3f[] vertices) Instantiate a simplex shape based on the specified array.
SimplexCollisionShape(Vector3f point1, Vector3f point2) Instantiate a line-segment shape based on the specified endpoints.
SimplexCollisionShape(Vector3f vertex1, Vector3f vertex2, Vector3f vertex3) Instantiate a triangular shape based on the specified vertices.
SimplexCollisionShape(Vector3f vertex1, Vector3f vertex2, Vector3f vertex3, Vector3f vertex4) Instantiate a tetrahedral shape based on the specified vertices.

Method Summary

Modifier and Type	Method and Description
boolean	canScale(Vector3f scale) Test whether the specified scale factors can be applied to the shape.
Vector3f	copyVertex(int index, Vector3f storeResult) Copy the indexed vertex.
float[]	copyVertices() Copy the unscaled vertex locations.
int	countMeshVertices() Count the points used to generate the simplex.
Vector3f	getHalfExtents(Vector3f storeResult) Calculate the unscaled half extents of the simplex.
float	maxRadius() Calculate how far the shape extends from its origin, including margin.
protected void	recalculateAabb() Recalculate the shape's bounding box if necessary.
HullCollisionShape	toHullShape() Approximate this shape with a HullCollisionShape.
float	unscaledVolume() Calculate the unscaled volume of the simplex.

Methods inherited from class com.jme3.bullet.collision.shapes.ConvexShape

isConcave, isConvex, scaledVolume, toSplittableShape

Methods inherited from class com.jme3.bullet.collision.shapes.CollisionShape

aabbCenter, boundingBox, boundingBox, canSplit, getDefaultMargin, getMargin, getScale, getScaleDp, getShapeType, getShapeType, isContactFilterEnabled, isInfinite, isNonMoving, isPolyhedral, nativeMargin, setContactFilterEnabled, setDefaultMargin, setMargin, setNativeId, setScale, setScale, setUserIndex, setUserIndex2, toString, updateScale, userIndex, userIndex2

Methods inherited from class com.jme3.bullet.NativePhysicsObject

compareTo, countTrackers, dumpTrackers, equals, freeUnusedObjects, hasAssignedNativeObject, hashCode, nativeId, reassignNativeId, setNativeIdNotTracked, unassignNativeObject

Methods inherited from class java.lang.Object

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

Field Detail

logger2

public static final java.util.logging.Logger logger2

message logger for this class

Constructor Detail

SimplexCollisionShape

public SimplexCollisionShape(Vector3f location)

Instantiate a point shape based on the specified location.

Parameters:

location - the location of the point (in shape coordinates, not null, unaffected)

SimplexCollisionShape

public SimplexCollisionShape(Vector3f point1,
                             Vector3f point2)

Instantiate a line-segment shape based on the specified endpoints.

Parameters:

point1 - the location of first endpoint (in shape coordinates, not null, unaffected)

point2 - the location of 2nd endpoint (in shape coordinates, not null, unaffected)

SimplexCollisionShape

public SimplexCollisionShape(Vector3f vertex1,
                             Vector3f vertex2,
                             Vector3f vertex3)

Instantiate a triangular shape based on the specified vertices.

Parameters:

vertex1 - the location of first vertex (in shape coordinates, not null, unaffected)

vertex2 - the location of 2nd vertex (in shape coordinates, not null, unaffected)

vertex3 - the location of 3rd vertex (in shape coordinates, not null, unaffected)

SimplexCollisionShape

public SimplexCollisionShape(Vector3f vertex1,
                             Vector3f vertex2,
                             Vector3f vertex3,
                             Vector3f vertex4)

Instantiate a tetrahedral shape based on the specified vertices.

Parameters:

vertex1 - the location of first vertex (in shape coordinates, not null, unaffected)

vertex2 - the location of 2nd vertex (in shape coordinates, not null, unaffected)

vertex3 - the location of 3rd vertex (in shape coordinates, not null, unaffected)

vertex4 - the location of 4th vertex (in shape coordinates, not null, unaffected)

SimplexCollisionShape

public SimplexCollisionShape(java.nio.FloatBuffer buffer,
                             int startPosition,
                             int endPosition)

Instantiate a simplex shape based on the specified FloatBuffer range.

Parameters:

buffer - the buffer that contains the vertex locations (not null, unaffected)

startPosition - the buffer position at which the vertex locations start (≥0, ≤endPosition-3)

endPosition - the buffer position at which the vertex locations end (≥startPosition+3, ≤capacity)

SimplexCollisionShape

public SimplexCollisionShape(Vector3f[] vertices)

Instantiate a simplex shape based on the specified array.

Parameters:

vertices - an array of vertex locations (not null, not empty, unaffected)

Method Detail

copyVertex

public Vector3f copyVertex(int index,
                           Vector3f storeResult)

Copy the indexed vertex.

Parameters:

index - (≥0, <4)

storeResult - storage for the result (modified if not null)

Returns:

the location of the vertex (either storeResult or a new instance)

copyVertices

public float[] copyVertices()

Copy the unscaled vertex locations.

Returns:

a new array (not null)

countMeshVertices

public int countMeshVertices()

Count the points used to generate the simplex.

Returns:

the count (≥1, ≤4)

getHalfExtents

public Vector3f getHalfExtents(Vector3f storeResult)

Calculate the unscaled half extents of the simplex.

Parameters:

storeResult - storage for the result (modified if not null)

Returns:

the unscaled half extent for each local axis (either storeResult or a new vector, not null, no negative component)

unscaledVolume

public float unscaledVolume()

Calculate the unscaled volume of the simplex.

Returns:

the volume (in shape units cubed, ≥0)

canScale

public boolean canScale(Vector3f scale)

Test whether the specified scale factors can be applied to the shape. For simplex shapes, scaling must be unity.

Overrides:

canScale in class CollisionShape

Parameters:

scale - the desired scale factor for each local axis (may be null, unaffected)

Returns:

true if applicable, otherwise false

maxRadius

public float maxRadius()

Calculate how far the shape extends from its origin, including margin.

Overrides:

maxRadius in class CollisionShape

Returns:

the distance (in physics-space units, ≥0)

recalculateAabb

protected void recalculateAabb()

Recalculate the shape's bounding box if necessary.

Overrides:

recalculateAabb in class CollisionShape

toHullShape

public HullCollisionShape toHullShape()

Approximate this shape with a HullCollisionShape.

Overrides:

toHullShape in class ConvexShape

Returns:

a new shape