Two curved edges, or a curved edge and a vertex, lying in the plane; each line touches the edges and passes through the vertex.
A frame whose origin and normal give the plane the shapes lie in; the lines are drawn in it too.
OptionalangularHow nearly a line must run along a curve where it touches to count as tangent, as the sine of the angle between them.
OptionalonWhen true, keeps only the lines that touch each edge within its ends; otherwise arcs count as whole circles.
Two edges, or an edge and a vertex, and the plane they lie in for
shapes.edge.linesTangentToTwo, which draws every straight line touching both.