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stlwrite - Write binary or ascii STL file

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stlwrite - Write binary or ascii STL file

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This is an update to the excellent work done by Sven Holcombe to add color support

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Description

  STLWRITE(FILE,fv) writes a stereolithography (STL) file to FILE for a triangulated
  patch defined by FV (a structure with fields 'vertices' and 'faces').

  STLWRITE(FILE,FACES,VERTICES) takes faces and vertices separately, rather than in an FV struct

  STLWRITE(FILE,X,Y,Z) creates an STL file from surface data in X, Y, and Z. STLWRITE triangulates
  this gridded data into a triangulated surface using triangulations options specified below. X, Y
  and Z can be two-dimensional arrays with the same size. If X and Y are vectors with length equal
  to SIZE(Z,2) and SIZE(Z,1), respectively, they are passed through MESHGRID to create gridded
  data. If X or Y are scalar values, they are used to specify the X and Y spacing between grid
  points.

  STLWRITE(...,'PropertyName',VALUE,'PropertyName',VALUE,...) writes an STL file using the
  following property values:

  MODE - File is written using 'binary' (default) or 'ascii'.

  TITLE - Header text (max 80 characters) written to the STL file.

  TRIANGULATION - When used with gridded data, TRIANGULATION is either:
                    'delaunay' - (default) Delaunay triangulation of X, Y
                    'f' - Forward slash division of grid quadrilaterals
                    'b' - Back slash division of quadrilaterals
                    'x' - Cross division of quadrilaterals
                  Note that 'f', 'b', or 't' triangulations require FEX entry 28327, "mesh2tri".

   FACECOLOR - [nx3]- [red_1, green_1, blue_1; red_2, green_2, blue_2; ...; red_n, green_n, blue_n]
    - N is the number of faces.
    - range for colors is 5 bits (0:31).
    - Only works in binary files.

  Example 1:
      % Write binary STL from face/vertex data
      tmpvol = zeros(20,20,20); % Empty voxel volume
      tmpvol(8:12,8:12,5:15) = 1; % Turn some voxels on
      fv = isosurface(tmpvol, 0.99); % Create the patch object
      stlwrite('test.stl',fv) % Save to binary .stl

  Example 2:
      % Write ascii STL from gridded data
      [X,Y] = deal(1:40); % Create grid reference
      Z = peaks(40); % Create grid height
      stlwrite('test.stl',X,Y,Z,'mode','ascii')

  Original idea adapted from surf2stl by Bill McDonald. Huge speed
  improvements implemented by Oliver Woodford. Non-Delaunay triangulation
  of quadrilateral surface input requires mesh2tri by Kevin Moerman.

Note: This entry was originally titled "patch2stl", however has been renamed to "stlwrite" after more general input was added.

Acknowledgements

Stlwrite Write Binary Or Ascii Stl File inspired this file.

This file inspired Visual Hull Matlab.

MATLAB release MATLAB 7.12 (R2011a)
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Comments and Ratings (3)
17 Mar 2014 Thomas Clark

Immediate bug using the STLWRITE(FILE,FACES,VERTICES) syntax:

'Attempted to access facecolor(:,1); index out of bounds because size(facecolor)=[0,0]'

Unfortunately, the options parsing code is pretty dense (much denser than it need be, I think) so rather than debug it myself, I'm shifting back to Sven's code.

Grant, you may find this submission useful; its a very convenient and robust way of options parsing:
http://www.mathworks.com/matlabcentral/fileexchange/9082-parsepvpairs

04 Jul 2013 Sven

Hi Chris, just a note that the stlwrite on which this file is based has facecolor implemented properly.

03 Jul 2013 Chris Rorden

This is a useful tool. Unfortunately, Grant's new version has a small bug, which you can elicit by running "Example 1" from the help. To fix this bug, change the line
if isfield(options, 'facecolor')
to read
if isfield(options, 'facecolor') && (length(options.facecolor) > 0)

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