API Reference > geometry-core > Bspline > Bezier1dNd > subdivideInPlaceKeepLeft subdivideInPlaceKeepLeft Method Apply deCasteljou interpolations to isolate a smaller bezier polygon, representing interval 0..fraction of the original subdivideInPlaceKeepLeft(fraction: number): boolean Parameter Type Description fraction number "end" fraction for split. Returns - boolean false if fraction is 0 -- no changes applied. Defined in core/geometry/src/bspline/Bezier1dNd.ts Line 289 Last Updated: 13 June, 2024