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package tesseract.objects;
import javax.media.j3d.Transform3D;
import javax.vecmath.*;
import common.CollidableObject;
public abstract class Polygon extends PhysicalObject {
public Vector3f normal;
// Right-hand side of the plane equation: Ax + By + Cz = D
public float intercept;
public Polygon(Vector3f position, Vector3f normal) {
this(1, position, normal);
}
public Polygon(float mass, Vector3f position, Vector3f normal) {
super(position, mass);
this.normal = new Vector3f(normal);
this.normal.normalize();
intercept = this.normal.dot(position);
Vector3f newX = new Vector3f(1, 0, 0);
if (Math.abs(newX.dot(this.normal)) == 1)
newX = new Vector3f(0, -1, 0);
newX.scaleAdd(-newX.dot(this.normal), this.normal, newX);
newX.normalize();
Vector3f newZ = new Vector3f();
newZ.cross(newX, this.normal);
new Matrix4f(new Matrix3f(newX.x, this.normal.x, newZ.x, newX.y, this.normal.y, newZ.y, newX.z, this.normal.z, newZ.z), position, 1).get(orientation);
}
protected void updateTransformGroup() {
super.updateTransformGroup();
Transform3D tmp = new Transform3D();
TG.getTransform(tmp);
Matrix3f rot = new Matrix3f();
tmp.get(rot);
normal.x = rot.m01;
normal.y = rot.m11;
normal.z = rot.m21;
intercept = normal.dot(position);
}
}
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