Plotting triangulation on a surface using trisurf

[lukshuntim]

Hi,

It seems trisurf can also be used for plotting the triangulation on a 
surface. Here's a working example script which plots the function u = z 
on the triangulation on the surface of a sphere. I don't know enough 
about the patch function to say for sure that it will always work, 
though. The documentation and the demos don't seem to say anything on 
this usage.

 tri = [
    6   39   40
    6   40   41
    6   41   42
    6   42   39
    5   35   38
    5   37   38
    5   37   36
    5   36   35
   10   22   44
   13   26   56
   16   30   62
   18   34   50
    9   21   47
   15   29   61
   15   29   57
   12   25   45
   13   46   26
   16   58   30
   18   64   34
   10   48   22
   17   49   33
   17   63   33
   12   55   25
    9   43   21
    7   46   44
   11   58   56
   14   64   62
    8   48   50
    8   49   47
   14   63   61
   11   55   57
    7   43   45
   39   10   53
   40   13   60
   41   16   66
   42   18   54
   35    9   52
   37   15   65
   37   15   59
   36   12   51
   22    1   19
   26    2   24
   30    3   28
   34    4   31
   21    1   20
   29    3   28
   29    3   27
   25    2   23
   46    7   23
   58   11   27
   64   14   32
   48    8   20
   49    8   31
   63   14   32
   55   11   24
   43    7   19
   46   13   53
   58   16   60
   64   18   66
   48   10   54
   49   17   52
   63   17   65
   55   12   59
   43    9   51
   40   53   13
   41   60   16
   42   66   18
   39   54   10
   38   52   17
   38   65   17
   36   59   12
   35   51    9
   44   19    7
   56   24   11
   62   28   14
   50   31    8
   47   20    8
   61   28   14
   57   27   11
   45   23    7
   26   23    2
   30   27    3
   34   32    4
   22   20    1
   33   31    4
   33   32    4
   25   24    2
   21   19    1
   44   53   10
   56   60   13
   62   66   16
   50   54   18
   47   52    9
   61   65   15
   57   59   15
   45   51   12
   53   40   39
   60   41   40
   66   42   41
   54   39   42
   52   38   35
   65   38   37
   59   36   37
   51   35   36
   19   44   22
   24   56   26
   28   62   30
   31   50   34
   20   47   21
   28   61   29
   27   57   29
   23   45   25
   23   26   46
   27   30   58
   32   34   64
   20   22   48
   31   33   49
   32   33   63
   24   25   55
   19   21   43
   53   44   46
   60   56   58
   66   62   64
   54   50   48
   52   47   49
   65   61   63
   59   57   55
   51   45   43
   ];
 coord = [
   1.00000   0.00000   0.00000
   0.00000   1.00000   0.00000
  -1.00000   0.00000   0.00000
   0.00000  -1.00000   0.00000
   0.00000   0.00000   1.00000
   0.00000   0.00000  -1.00000
   0.70711   0.70711   0.00000
   0.70711  -0.70711   0.00000
   0.70711   0.00000   0.70711
   0.70711   0.00000  -0.70711
  -0.70711   0.70711   0.00000
   0.00000   0.70711   0.70711
   0.00000   0.70711  -0.70711
  -0.70711  -0.70711   0.00000
  -0.70711   0.00000   0.70711
  -0.70711   0.00000  -0.70711
   0.00000  -0.70711   0.70711
   0.00000  -0.70711  -0.70711
   0.94868   0.31623   0.00000
   0.94868  -0.31623   0.00000
   0.94868   0.00000   0.31623
   0.94868   0.00000  -0.31623
   0.31623   0.94868   0.00000
  -0.31623   0.94868   0.00000
   0.00000   0.94868   0.31623
   0.00000   0.94868  -0.31623
  -0.94868   0.31623   0.00000
  -0.94868  -0.31623   0.00000
  -0.94868   0.00000   0.31623
  -0.94868   0.00000  -0.31623
   0.31623  -0.94868   0.00000
  -0.31623  -0.94868   0.00000
   0.00000  -0.94868   0.31623
   0.00000  -0.94868  -0.31623
   0.31623   0.00000   0.94868
   0.00000   0.31623   0.94868
  -0.31623   0.00000   0.94868
   0.00000  -0.31623   0.94868
   0.31623   0.00000  -0.94868
   0.00000   0.31623  -0.94868
  -0.31623   0.00000  -0.94868
   0.00000  -0.31623  -0.94868
   0.81650   0.40825   0.40825
   0.81650   0.40825  -0.40825
   0.40825   0.81650   0.40825
   0.40825   0.81650  -0.40825
   0.81650  -0.40825   0.40825
   0.81650  -0.40825  -0.40825
   0.40825  -0.81650   0.40825
   0.40825  -0.81650  -0.40825
   0.40825   0.40825   0.81650
   0.40825  -0.40825   0.81650
   0.40825   0.40825  -0.81650
   0.40825  -0.40825  -0.81650
  -0.40825   0.81650   0.40825
  -0.40825   0.81650  -0.40825
  -0.81650   0.40825   0.40825
  -0.81650   0.40825  -0.40825
  -0.40825   0.40825   0.81650
  -0.40825   0.40825  -0.81650
  -0.81650  -0.40825   0.40825
  -0.81650  -0.40825  -0.40825
  -0.40825  -0.81650   0.40825
  -0.40825  -0.81650  -0.40825
  -0.40825  -0.40825   0.81650
  -0.40825  -0.40825  -0.81650
  ];
 trisurf (tri, coord(:, 1), coord(:, 2), coord(:, 3),  coord(:,3), 
'facecolor', 'interp', 'edgecolor', 'k' );
 colorbar;
 axis equal;
 xlabel ('x'); ylabel ('y'); zlabel ('z');
 title ('Function u = z on surface of sphere');

Regards,
ST
--