An edge or a wire and places along it as fractions, for analysis.curves.curvaturesAtParams,
shapes.edge.splitEdgeAtParams and shapes.wire.splitWireAtParams.
Places along the curve, each a fraction from 0 at the start to 1 at the end; each edge of a
wire takes an equal share, as in shapes.wire.pointOnWireAtParam.
An edge or a wire and places along it as fractions, for
analysis.curves.curvaturesAtParams,shapes.edge.splitEdgeAtParamsandshapes.wire.splitWireAtParams.