Algorithm (Workflow)

This function, SGcompass, creates a 3D model of a compass using a series of geometric transformations and operations. Below is a detailed explanation of the algorithm and its parameters:

Input Parameters

The function SGcompass does not take any input parameters. It operates with predefined values and functions to generate the compass geometry.

Algorithm Steps

1. Create Radial Edges:
   • Use CPLradialEdges on a square defined by PLsquare([60 60]) to create radial edges with 6 divisions.
2. Create Circular Pattern:
   • Generate a circular pattern using PLcircle with a radius of 1.5 + slfit('s').
   • Copy this pattern using CPLcopypattern with a grid of [2 2] and spacing of [48 48].
   • Align the pattern using CPLtransrelCPL with the 'incenter' option.
3. Combine Geometries:
   • Subtract the circular pattern from the radial edges using CPLtransrelCPL with 'incenter' and '-'.
   • Add a square of size [45 4] on top using CPLtransrelCPL with 'ontop' and '+'.
   • Add another square of size [33 13] underneath using CPLtransrelCPL with 'under' and '+'.
4. Create 3D Geometry:
   • Convert the 2D geometry to 3D using SGofCPLz with a height of 51.
5. Subtract Cylinder:
   • Subtract a cylinder with a radius of 27 and height of 2 from the top using SGsubtract with 'ontop' and -1.
6. Optional Visualization:
   • If no output is requested (nargout==0), plot the geometry using SGfigure and SGplotalpha with a white color ('w').

Output

The function returns the 3D geometry of the compass as SG.