pub fn two_point_conical_with_interpolation<'a>(
(start, start_radius): (impl Into<Point>, scalar),
(end, end_radius): (impl Into<Point>, scalar),
(colors, color_space): (&[Color4f], impl Into<Option<ColorSpace>>),
pos: impl Into<Option<&'a [scalar]>>,
mode: TileMode,
interpolation: impl Into<Interpolation>,
local_matrix: impl Into<Option<&'a Matrix>>,
) -> Option<Shader>