/**
* barsuift-simlife is a life simulator programm
*
* Copyright (C) 2010 Cyrille GACHOT
*
* This file is part of barsuift-simlife.
*
* barsuift-simlife is free software: you can redistribute it and/or modify it under the terms of the GNU General Public
* License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later
* version.
*
* barsuift-simlife 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 General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License along with barsuift-simlife. If not, see
* <http://www.gnu.org/licenses/>.
*/
package barsuift.simLife.j3d.util;
import javax.vecmath.Point3d;
import javax.vecmath.Point3f;
import javax.vecmath.Vector3d;
import javax.vecmath.Vector3f;
public final class NormalHelper {
private NormalHelper() {
// private constructor to enforce static access
}
/**
* Computes the normal vector based on the surface defined by the 3 given points
*
* @param p1 first point
* @param p2 second point
* @param p3 third point
*/
public static Vector3f computeNormal(Point3f p1, Point3f p2, Point3f p3) {
Vector3f normal = new Vector3f();
Vector3f vector1 = new Vector3f();
Vector3f vector2 = new Vector3f();
vector1.sub(p2, p1);
vector2.sub(p3, p1);
normal.cross(vector1, vector2);
normal.normalize();
return normal;
}
/**
* Computes the normal vector based on the surface defined by the 3 given points
*
* @param p1 first point
* @param p2 second point
* @param p3 third point
*/
public static Vector3f computeNormal(Point3d p1, Point3d p2, Point3d p3) {
Vector3d normal = new Vector3d();
Vector3d vector1 = new Vector3d();
Vector3d vector2 = new Vector3d();
vector1.sub(p2, p1);
vector2.sub(p3, p1);
normal.cross(vector1, vector2);
normal.normalize();
return new Vector3f(normal);
}
}