/*
* Copyright (c) 2009-2012 jMonkeyEngine
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* * Neither the name of 'jMonkeyEngine' nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.jme3.math;
import com.jme3.export.JmeExporter;
import com.jme3.export.JmeImporter;
import com.jme3.export.Savable;
import java.io.IOException;
/**
* <code>Triangle</code> defines an object for containing triangle information.
* The triangle is defined by a collection of three {@link Vector3f}
* objects.
*
* @author Mark Powell
* @author Joshua Slack
*/
public class Triangle extends AbstractTriangle implements Savable, Cloneable, java.io.Serializable {
static final long serialVersionUID = 1;
private Vector3f pointa = new Vector3f();
private Vector3f pointb = new Vector3f();
private Vector3f pointc = new Vector3f();
private transient Vector3f center;
private transient Vector3f normal;
private float projection;
private int index;
public Triangle() {
}
/**
* Constructor instantiates a new <Code>Triangle</code> object with the
* supplied vectors as the points. It is recommended that the vertices
* be supplied in a counter clockwise winding to support normals for a
* right handed coordinate system.
* @param p1 the first point of the triangle.
* @param p2 the second point of the triangle.
* @param p3 the third point of the triangle.
*/
public Triangle(Vector3f p1, Vector3f p2, Vector3f p3) {
pointa.set(p1);
pointb.set(p2);
pointc.set(p3);
}
/**
*
* <code>get</code> retrieves a point on the triangle denoted by the index
* supplied.
* @param i the index of the point.
* @return the point.
*/
public Vector3f get(int i) {
switch (i) {
case 0:
return pointa;
case 1:
return pointb;
case 2:
return pointc;
default:
return null;
}
}
public Vector3f get1() {
return pointa;
}
public Vector3f get2() {
return pointb;
}
public Vector3f get3() {
return pointc;
}
/**
*
* <code>set</code> sets one of the triangle's points to that specified as
* a parameter.
* @param i the index to place the point.
* @param point the point to set.
*/
public void set(int i, Vector3f point) {
switch (i) {
case 0:
pointa.set(point);
break;
case 1:
pointb.set(point);
break;
case 2:
pointc.set(point);
break;
}
}
/**
*
* <code>set</code> sets one of the triangle's points to that specified as
* a parameter.
* @param i the index to place the point.
*/
public void set(int i, float x, float y, float z) {
switch (i) {
case 0:
pointa.set(x, y, z);
break;
case 1:
pointb.set(x, y, z);
break;
case 2:
pointc.set(x, y, z);
break;
}
}
public void set1(Vector3f v) {
pointa.set(v);
}
public void set2(Vector3f v) {
pointb.set(v);
}
public void set3(Vector3f v) {
pointc.set(v);
}
public void set(Vector3f v1, Vector3f v2, Vector3f v3) {
pointa.set(v1);
pointb.set(v2);
pointc.set(v3);
}
/**
* calculateCenter finds the average point of the triangle.
*
*/
public void calculateCenter() {
if (center == null) {
center = new Vector3f(pointa);
} else {
center.set(pointa);
}
center.addLocal(pointb).addLocal(pointc).multLocal(FastMath.ONE_THIRD);
}
/**
* calculateNormal generates the normal for this triangle
*
*/
public void calculateNormal() {
if (normal == null) {
normal = new Vector3f(pointb);
} else {
normal.set(pointb);
}
normal.subtractLocal(pointa).crossLocal(pointc.x - pointa.x, pointc.y - pointa.y, pointc.z - pointa.z);
normal.normalizeLocal();
}
/**
* obtains the center point of this triangle (average of the three triangles)
* @return the center point.
*/
public Vector3f getCenter() {
if (center == null) {
calculateCenter();
}
return center;
}
/**
* sets the center point of this triangle (average of the three triangles)
* @param center the center point.
*/
public void setCenter(Vector3f center) {
this.center = center;
}
/**
* obtains the unit length normal vector of this triangle, if set or
* calculated
*
* @return the normal vector
*/
public Vector3f getNormal() {
if (normal == null) {
calculateNormal();
}
return normal;
}
/**
* sets the normal vector of this triangle (to conform, must be unit length)
* @param normal the normal vector.
*/
public void setNormal(Vector3f normal) {
this.normal = normal;
}
/**
* obtains the projection of the vertices relative to the line origin.
* @return the projection of the triangle.
*/
public float getProjection() {
return this.projection;
}
/**
* sets the projection of the vertices relative to the line origin.
* @param projection the projection of the triangle.
*/
public void setProjection(float projection) {
this.projection = projection;
}
/**
* obtains an index that this triangle represents if it is contained in a OBBTree.
* @return the index in an OBBtree
*/
public int getIndex() {
return index;
}
/**
* sets an index that this triangle represents if it is contained in a OBBTree.
* @param index the index in an OBBtree
*/
public void setIndex(int index) {
this.index = index;
}
public static Vector3f computeTriangleNormal(Vector3f v1, Vector3f v2, Vector3f v3, Vector3f store) {
if (store == null) {
store = new Vector3f(v2);
} else {
store.set(v2);
}
store.subtractLocal(v1).crossLocal(v3.x - v1.x, v3.y - v1.y, v3.z - v1.z);
return store.normalizeLocal();
}
public void write(JmeExporter e) throws IOException {
e.getCapsule(this).write(pointa, "pointa", Vector3f.ZERO);
e.getCapsule(this).write(pointb, "pointb", Vector3f.ZERO);
e.getCapsule(this).write(pointc, "pointc", Vector3f.ZERO);
}
public void read(JmeImporter e) throws IOException {
pointa = (Vector3f) e.getCapsule(this).readSavable("pointa", Vector3f.ZERO.clone());
pointb = (Vector3f) e.getCapsule(this).readSavable("pointb", Vector3f.ZERO.clone());
pointc = (Vector3f) e.getCapsule(this).readSavable("pointc", Vector3f.ZERO.clone());
}
@Override
public Triangle clone() {
try {
Triangle t = (Triangle) super.clone();
t.pointa = pointa.clone();
t.pointb = pointb.clone();
t.pointc = pointc.clone();
return t;
} catch (CloneNotSupportedException e) {
throw new AssertionError();
}
}
}