public Point diff(Point p) {
p = p.toUnit(unit);
p.x -= x;
p.y -= y;
p.z -= z;
return p;
}
public void translateI(Point delta) {
if (delta.unit != unit) {
delta = delta.toUnit(unit);
}
x += delta.x;
y += delta.y;
z += delta.z;
}
public double distance2(Point p) {
if (p.unit != unit) {
p = p.toUnit(unit);
}
return (p.x - x) * (p.x - x) + (p.y - y) * (p.y - y) + (p.z - z) * (p.z - z);
}
public double distance(Point p) {
if (p.unit != unit) {
p = p.toUnit(unit);
}
return Math.sqrt((p.x - x) * (p.x - x) + (p.y - y) * (p.y - y) + (p.z - z) * (p.z - z));
}