Documentation for to_objfile().

DeProjMethods.md

@@ -21,6 +21,7 @@ But the really important methods are those who create a `deproj` analysis result
                * [The import.](#the-import-1)
             * [to_table](#to_table)
             * [to_file](#to_file)
+            * [to_objfile](#to_objfile)
             * [figure_cell_sizes](#figure_cell_sizes)
             * [figure_tissue_orientation](#figure_tissue_orientation)
             * [figure_cell_elongation](#figure_cell_elongation)
@@ -319,6 +320,22 @@ dpr.to_file( 'table.xlsx' )
 
 ![ExampleExport](static/ExampleExport.png)
 
+#### `to_objfile`
+
+`to_objfile( obj, file_name, simplified )`
+
+Exports the tissue mesh to a Wavefront OBJ file (see https://en.wikipedia.org/wiki/Wavefront_.obj_file).
+
+If `simplified` is `true`, then we only export a simplified mesh made of the junction graph. Otherwise we export one face per cell, with the vertices being the points along the cell contour.
+
+Simplified mesh:
+
+![ExampleExport](static/toobjfile_simplified.png)
+
+Full mesh:
+
+![ExampleExport](static/toobjfile.png)
+
 #### `figure_cell_sizes`
 
 `[ hf, ax1, ax2 ] = figure_cell_sizes( obj, scale_bar_length )`
@@ -632,4 +649,4 @@ The first output arguments `f3d` contains the ellipse parameter in cartesian for
 - The semi-minor axis of the ellipse `b`. We always have `a > b` and both values are positive.
 - The angle of the semi-major axis with the X'' axis, after the composed rotation by the Euler angles.
 
-The second argument `R` is the rotation matrix computed from the Euler angles.
+The second argument `R` is the rotation matrix computed from the Euler angles.
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