public void renderTrail() {

		Vec3D ls = null;
		for (Vec3D l : trail) {
			if (ls != null) {
				p5.strokeWeight(1);
				p5.stroke(255);
				p5.line(l.x, l.y, l.z, ls.x, ls.y, ls.z);
			}
			ls = l;
		}
	}