Package com.jme3.math

Class Triangle

java.lang.Object

com.jme3.math.Triangle

public class Triangle
extends Object

Describes a triangle in terms of its vertex locations, with auxiliary storage for its normal vector.

Constructor Summary

Constructors

Constructor	Description
Triangle()	Instantiate a zero-size triangle at the origin.
Triangle(Vector3f p1, Vector3f p2, Vector3f p3)	Instantiates a triangle with the specified vertex locations.

Method Summary

Modifier and Type	Method	Description
void	calculateNormal()	Recalculates the stored normal based on the current vertex locations.
Vector3f	get(int i)	Accesses the location of the indexed vertex.
Vector3f	get1()	Accesses the location of the first vertex.
Vector3f	get2()	Accesses the location of the 2nd vertex.
Vector3f	get3()	Accesses the location of the 3rd vertex.
Vector3f	getNormal()	Accesses the stored normal, updating it if it is null.
void	set(int i, Vector3f point)	Alters the location of the indexed vertex and deletes the stored normal.
void	set(Vector3f v1, Vector3f v2, Vector3f v3)	Alters the locations of all 3 vertices and deletes the stored normal.
void	set1(Vector3f v)	Alters the location of the first vertex and deletes the stored normal.
void	set2(Vector3f v)	Alters the location of the 2nd vertex and deletes the stored normal.
void	set3(Vector3f v)	Alters the location of the 3rd vertex and deletes the stored normal.

Methods inherited from class java.lang.Object

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

Constructor Details

Triangle

public Triangle()

Instantiate a zero-size triangle at the origin.

Triangle

public Triangle(Vector3f p1,
 Vector3f p2,
 Vector3f p3)

Instantiates a triangle with the specified vertex locations. Vertices should be listed in the desired winding order, typically counter-clockwise.

Parameters:

p1 - the location of the first vertex (not null, unaffected)

p2 - the location of the 2nd vertex (not null, unaffected)

p3 - the location of the 3rd vertex (not null, unaffected)

Method Details

get

public Vector3f get(int i)

Accesses the location of the indexed vertex.

Parameters:

i - the index of the vertex to access (0, 1, or 2)

Returns:

a pre-existing location vector, or null if the index is invalid

get1

public Vector3f get1()

Accesses the location of the first vertex.

Returns:

the pre-existing location vector (not null)

get2

public Vector3f get2()

Accesses the location of the 2nd vertex.

Returns:

the pre-existing location vector (not null)

get3

public Vector3f get3()

Accesses the location of the 3rd vertex.

Returns:

the pre-existing location vector (not null)

set

public void set(int i,
 Vector3f point)

Alters the location of the indexed vertex and deletes the stored normal.

Parameters:

i - the index of the vertex to alter (0, 1, or 2)

point - the desired location (not null, unaffected)

set1

public void set1(Vector3f v)

Alters the location of the first vertex and deletes the stored normal.

Parameters:

v - the desired location (not null, unaffected)

set2

public void set2(Vector3f v)

Alters the location of the 2nd vertex and deletes the stored normal.

Parameters:

v - the desired location (not null, unaffected)

set3

public void set3(Vector3f v)

Alters the location of the 3rd vertex and deletes the stored normal.

Parameters:

v - the desired location (not null, unaffected)

set

public void set(Vector3f v1,
 Vector3f v2,
 Vector3f v3)

Alters the locations of all 3 vertices and deletes the stored normal.

Parameters:

v1 - the desired location of the first vertex (not null, unaffected)

v2 - the desired location of the 2nd vertex (not null, unaffected)

v3 - the desired location of the 3rd vertex (not null, unaffected)

calculateNormal

public void calculateNormal()

Recalculates the stored normal based on the current vertex locations.

getNormal

public Vector3f getNormal()

Accesses the stored normal, updating it if it is null.

Returns:

unit normal vector (an internal vector subject to re-use)