Vector3D.java

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package theba.core.math;

public class Vector3D {
        public double x, y, z;

        public Vector3D(double x, double y, double z) {
                this.x = x;
                this.y = y;
                this.z = z;
        }

        public Vector3D(Point3D pt) {
                this.x = pt.x;
                this.y = pt.y;
                this.z = pt.z;
        }

        @Override
        public String toString() {
                return (float) x + "," + (float) y + "," + (float) z;
        }

        public double distanceFrom(Point3D p2) {
                double a = x - p2.x;
                double b = y - p2.y;
                double c = z - p2.z;

                return (Math.sqrt(a * a + b * b + c * c));
        }

        public void normalize() {
                double length = distanceFrom(new Point3D(0, 0, 0));
                x /= length;
                y /= length;
                z /= length;
        }
}