Algorithm (Workflow)

This function, VLofSG, is designed to handle nested solid geometries and extract a vertex list from them. It is part of the SG-Library and was created by Tim Lueth. The function is particularly useful for dealing with complex structures where solids are nested within cells.

Input Parameters

• SG: This is the input parameter representing nested solid geometry. It can be a cell array containing other cells of solids.

Output Results

• VL: The output is a vertex list extracted from the nested solid geometry.

Algorithm Steps

1. The function first checks if the input SG is a cell array using iscell(SG).
2. If SG is a cell array:
   • Initialize an empty vertex list VL=[].
   • Determine the number of elements in the cell array with n=length(SG).
   • Iterate over each element in the cell array using a for loop.
   • For each element, recursively call VLofSG(SG{i}) to extract the vertex list and concatenate it to VL.
3. If SG is not a cell array:
   • Check if SG has a field named 'VL' using isfield(SG,'VL').
   • If the field exists, assign SG.VL to VL.
   • If the field does not exist, assign SG directly to VL.
4. If no output argument is specified (nargout==0), the function will:
   • Call SGfigure(-30,30) to set up a figure for plotting.
   • Use VLplot(VL,'r.') to plot the vertex list in red.

This function is particularly useful for visualizing and extracting vertex data from complex nested solid structures, making it a valuable tool in the SG-Library.