Function make_surface 

pub fn make_surface(surf: &Surface3D) -> Box<Surface<Decimal, Decimal, Decimal>>

Creates a 3D surface representation wrapped in a Box, based on the input Surface3D structure.

This function converts the input Surface3D data into a Surface object, which includes the x, y, and z coordinate mappings. If any of the x, y, or z coordinate vectors in the input are empty, it creates a default 2x2 surface with all z values initialized to zero and x/y spanning the range [0, 1].

Parameters

• surf: A reference to a Surface3D object, which contains x, y, and z coordinate vectors and an optional name for the surface.

Returns

• A Box containing a Surface<Decimal, Decimal, Decimal> object, where:
  • x and y axes are unique and sorted.
  • z values are represented in a 2D matrix where rows correspond to y values and columns correspond to x values.

Logic Details

1. Edge Case Handling: If any of surf.x, surf.y, or surf.z is empty, create a default 2x2 surface:

   • All z values are initialized to Decimal::ZERO.
   • x and y coordinates are [0, 1].
   • The surface name remains as provided in the surf.name.

2. Unique and Sorted Axes:

   • Extract unique and sorted x and y coordinates using a BTreeSet.
   • These unique x and y coordinates are then stored in vectors (x_unique and y_unique).

3. Mapping Coordinates:

   • Create mappings (x_to_col and y_to_row) to translate x and y coordinates into column and row indices of the z_matrix. Each coordinate is mapped to its respective index in the