Create a field encoding the distance from any point in space to one or more shapes.

Input parameters:

1. Sh → Collection of shapes. Allowed types are limited to points, planes, curves, and surfaces.
2. Ff → Field magnitude as a function of distance.
3. Ln → If true, the field magnitude is affected by the nearest shape only.
   •  True → Nearest
   • False → All

Output parameters:

1. Fl → Field representing distances to shapes.