[Octave-bug-tracker] [bug #44736] OpenGL / gl2ps printing alters or drops axis outline

[Rik]

Follow-up Comment #8, bug #44736 (project octave):

The code is in gl-render.cc in draw_patch.


patch_tesselator tess (this, fc_mode, fl_mode, 1.0);

and then

tess.begin_polygon (true);
tess.begin_contour ();


The patch_tesselator class is defined in gl-render.cc at the top of the file. 
The begin_polygon() routine is


void begin_polygon (bool filled = true)
{
  gluTessProperty (glu_tess, GLU_TESS_BOUNDARY_ONLY,
                   (filled ? GL_FALSE : GL_TRUE));
  fill = filled;
  gluTessBeginPolygon (glu_tess, this);
}


Octave gives over the vertices to OpenGL which then breaks the polygon into
triangles and calls the vertex() callback (line 459) for every vertex to set
color and lighting properties.


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