Method depthTo

src/main/java/field/graphics/FLine.java:1542–1546

handy method that sets the z coordinate of all the nodes in this FLine to be the `depth` of this box (or 0) @param of

(Box of)

	public long getModCount() {
		return mod;
	}

	@Override
	public FLine get() {
		return this;
	}