/*
* __ .__ .__ ._____.
* _/ |_ _______ __|__| ____ | | |__\_ |__ ______
* \ __\/ _ \ \/ / |/ ___\| | | || __ \ / ___/
* | | ( <_> > <| \ \___| |_| || \_\ \\___ \
* |__| \____/__/\_ \__|\___ >____/__||___ /____ >
* \/ \/ \/ \/
*
* Copyright (c) 2006-2011 Karsten Schmidt
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* http://creativecommons.org/licenses/LGPL/2.1/
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
package toxi.geom.mesh;
import toxi.geom.Triangle3D;
import toxi.geom.Vec2D;
import toxi.geom.Vec3D;
public class Face {
public Vertex a, b, c;
public Vec2D uvA, uvB, uvC;
public Vec3D normal;
public Face(Vertex a, Vertex b, Vertex c) {
this.a = a;
this.b = b;
this.c = c;
normal = a.sub(c).crossSelf(a.sub(b)).normalize();
a.addFaceNormal(normal);
b.addFaceNormal(normal);
c.addFaceNormal(normal);
}
public Face(Vertex a, Vertex b, Vertex c, Vec2D uvA, Vec2D uvB, Vec2D uvC) {
this(a, b, c);
this.uvA = uvA;
this.uvB = uvB;
this.uvC = uvC;
}
public void computeNormal() {
normal = a.sub(c).crossSelf(a.sub(b)).normalize();
}
public void flipVertexOrder() {
Vertex t = a;
a = b;
b = t;
normal.invert();
}
public Vec3D getCentroid() {
return a.add(b).addSelf(c).scale(1f / 3);
}
public final Vertex[] getVertices(Vertex[] verts) {
if (verts != null) {
verts[0] = a;
verts[1] = b;
verts[2] = c;
} else {
verts = new Vertex[] { a, b, c };
}
return verts;
}
public String toString() {
return getClass().getName() + " " + a + ", " + b + ", " + c;
}
/**
* Creates a generic {@link Triangle3D} instance using this face's vertices.
* The new instance is made up of copies of the original vertices and
* manipulating them will not impact the originals.
*
* @return triangle copy of this mesh face
*/
public Triangle3D toTriangle() {
return new Triangle3D(a.copy(), b.copy(), c.copy());
}
}