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jMonkeyEngine is a 3-D game engine for adventurous Java developers
/*
* Copyright (c) 2009-2020 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;
/**
* Triangle defines a triangle in terms of its vertex locations,
* with auxiliary storage for its centroid, normal vector, projection, and
* index.
*
* @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;
/**
* Instantiate a zero-size Triangle at the origin.
*/
public Triangle() {
}
/**
* Instantiate a Triangle with the specified vertex locations.
* Vertices should be listed in the desired winding order, typically
* counter-clockwise.
*
* @param p1 the location of the first vertex (not null, unaffected)
* @param p2 the location of the 2nd vertex (not null, unaffected)
* @param p3 the location of the 3rd vertex (not null, unaffected)
*/
public Triangle(Vector3f p1, Vector3f p2, Vector3f p3) {
pointa.set(p1);
pointb.set(p2);
pointc.set(p3);
}
/**
* Access the location of the indexed vertex.
*
* @param i the index of the vertex to access (0, 1, or 2)
* @return a pre-existing location vector, or null if the index is invalid
*/
public Vector3f get(int i) {
switch (i) {
case 0:
return pointa;
case 1:
return pointb;
case 2:
return pointc;
default:
return null;
}
}
/**
* Access the location of the first vertex.
*
* @return the pre-existing location vector (not null)
*/
@Override
public Vector3f get1() {
return pointa;
}
/**
* Access the location of the 2nd vertex.
*
* @return the pre-existing location vector (not null)
*/
@Override
public Vector3f get2() {
return pointb;
}
/**
* Access the location of the 3rd vertex.
*
* @return the pre-existing location vector (not null)
*/
@Override
public Vector3f get3() {
return pointc;
}
/**
* Alter the location of the indexed vertex and delete the stored centroid
* and normal.
*
* @param i the index of the vertex to alter (0, 1, or 2)
* @param point the desired location (not null, unaffected)
*/
public void set(int i, Vector3f point) {
center = null;
normal = null;
switch (i) {
case 0:
pointa.set(point);
break;
case 1:
pointb.set(point);
break;
case 2:
pointc.set(point);
break;
}
}
/**
* Alter the location of the indexed vertex and delete the stored centroid
* and normal.
*
* @param i the index of the vertex to alter (0, 1, or 2)
* @param x the desired X coordinate
* @param y the desired Y coordinate
* @param z the desired Z coordinate
*/
public void set(int i, float x, float y, float z) {
center = null;
normal = null;
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;
}
}
/**
* Alter the location of the first vertex and delete the stored centroid and
* normal.
*
* @param v the desired location (not null, unaffected)
*/
public void set1(Vector3f v) {
center = null;
normal = null;
pointa.set(v);
}
/**
* Alter the location of the 2nd vertex and delete the stored centroid and
* normal.
*
* @param v the desired location (not null, unaffected)
*/
public void set2(Vector3f v) {
center = null;
normal = null;
pointb.set(v);
}
/**
* Alter the location of the 3rd vertex and delete the stored centroid and
* normal.
*
* @param v the desired location (not null, unaffected)
*/
public void set3(Vector3f v) {
center = null;
normal = null;
pointc.set(v);
}
/**
* Alter the locations of all 3 vertices and delete the stored centroid and
* normal.
*
* @param v1 the desired location of the first vertex (not null, unaffected)
* @param v2 the desired location of the 2nd vertex (not null, unaffected)
* @param v3 the desired location of the 3rd vertex (not null, unaffected)
*/
@Override
public void set(Vector3f v1, Vector3f v2, Vector3f v3) {
center = null;
normal = null;
pointa.set(v1);
pointb.set(v2);
pointc.set(v3);
}
/**
* Recalculate the stored centroid based on the current vertex locations.
*/
public void calculateCenter() {
if (center == null) {
center = new Vector3f(pointa);
} else {
center.set(pointa);
}
center.addLocal(pointb).addLocal(pointc).multLocal(FastMath.ONE_THIRD);
}
/**
* Recalculate the stored normal based on the current vertex locations.
*/
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();
}
/**
* Access the stored centroid (the average of the 3 vertex locations)
* calculating it if it is null.
*
* @return the coordinates of the center (an internal vector subject to
* re-use)
*/
public Vector3f getCenter() {
if (center == null) {
calculateCenter();
}
return center;
}
/**
* Alter the stored centroid without affecting the stored normal or any
* vertex locations.
*
* @param center the desired value (alias created if not null)
*/
public void setCenter(Vector3f center) {
this.center = center;
}
/**
* Access the stored normal, updating it if it is null.
*
* @return unit normal vector (an internal vector subject to re-use)
*/
public Vector3f getNormal() {
if (normal == null) {
calculateNormal();
}
return normal;
}
/**
* Alter the stored normal without affecting the stored centroid or any
* vertex locations.
*
* @param normal the desired value (alias created if not null)
*/
public void setNormal(Vector3f normal) {
this.normal = normal;
}
/**
* Read the projection of the vertices relative to the line origin.
*
* @return the stored projection value
*/
public float getProjection() {
return this.projection;
}
/**
* Alter the projection of the vertices relative to the line origin.
*
* @param projection the desired projection value
*/
public void setProjection(float projection) {
this.projection = projection;
}
/**
* Read the index of this triangle, used to identify it in an OBBTree.
*
* @return the stored index
*/
public int getIndex() {
return index;
}
/**
* Alter the index of this triangle, used to identify it in an OBBTree.
*
* @param index the desired index
*/
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();
}
/**
* Serialize this triangle to the specified exporter, for example when
* saving to a J3O file.
*
* @param e (not null)
* @throws IOException from the exporter
*/
@Override
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);
}
/**
* De-serialize this triangle from the specified importer, for example when
* loading from a J3O file.
*
* @param importer (not null)
* @throws IOException from the importer
*/
@Override
public void read(JmeImporter importer) throws IOException {
pointa = (Vector3f) importer.getCapsule(this).readSavable("pointa", Vector3f.ZERO.clone());
pointb = (Vector3f) importer.getCapsule(this).readSavable("pointb", Vector3f.ZERO.clone());
pointc = (Vector3f) importer.getCapsule(this).readSavable("pointc", Vector3f.ZERO.clone());
}
/**
* Create a copy of this triangle.
*
* @return a new instance, equivalent to this one
*/
@Override
public Triangle clone() {
try {
Triangle t = (Triangle) super.clone();
t.pointa = pointa.clone();
t.pointb = pointb.clone();
t.pointc = pointc.clone();
// XXX: the center and normal are not cloned!
return t;
} catch (CloneNotSupportedException e) {
throw new AssertionError();
}
}
}
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