Knot LPE

Creates a knot from a flat self-intersecting curve: at each crossing, one strand is interrupted to make it look like it's going under the other. The "sign" of each crossing (first strand interrupted, second interrupted, or no interruptions) can be set independently by clicking the on-screen handle which can be dragged from one crossing to the other.

Warning: as far as possible, the LPE tries to keep the modifications of crossing signs unchanged under small deformations. For large or topology changing deformations however, some or all crossings might jump back to their default orientation.