postproc.py: new --parallel-projection option

- update Viewer.call_mlab(), .render_scene()

postproc.py

@@ -104,6 +104,8 @@
     '[default: if --3d is True: "45,45", else: "0,0"]',
     'roll' :
     'camera roll angle [default: %default]',
+    'parallel_projection' :
+    'use parallel projection',
     'fgcolor' :
     'foreground color, that is the color of all text annotation labels'
     ' (axes, orientation axes, scalar bar labels) [default: %default]',
@@ -244,6 +246,7 @@ def view_file(filename, filter_names, options, view=None):
 
         view(show=options.show, is_3d=options.is_3d, view=options.view,
              roll=options.roll,
+             parallel_projection=options.parallel_projection,
              fgcolor=options.fgcolor, bgcolor=options.bgcolor,
              layout=options.layout,
              scalar_mode=options.scalar_mode,
@@ -335,6 +338,9 @@ def main():
     group.add_option('--roll', type='float', metavar='angle',
                      action='store', dest='roll',
                      default=0.0, help=help['roll'])
+    group.add_option('--parallel-projection', metavar='parallel_projection',
+                     action='store_true', dest='parallel_projection',
+                     default=False, help=help['parallel_projection'])
     group.add_option('--fgcolor', metavar='R,G,B',
                      action='store', dest='fgcolor',
                      default='0.0,0.0,0.0', help=help['fgcolor'])

sfepy/postprocess/viewer.py

@@ -673,6 +673,7 @@ def render_scene(self, scene, options):
         self.build_mlab_pipeline(**options)
         self.source.update() # Force source update to see e.g. streamlines.
         scene.scene.reset_zoom()
+        scene.scene.camera.parallel_projection = options['parallel_projection']
 
         view = options['view']
         if view is None:
@@ -718,7 +719,7 @@ def call_empty(self, *args, **kwargs):
         pass
 
     def call_mlab(self, scene=None, show=True, is_3d=False,
-                  view=None, roll=None,
+                  view=None, roll=None, parallel_projection=False,
                   fgcolor=(0.0, 0.0, 0.0), bgcolor=(1.0, 1.0, 1.0),
                   layout='rowcol', scalar_mode='iso_surface',
                   vector_mode='arrows_norm', rel_scaling=None, clamping=False,
@@ -745,6 +746,8 @@ def call_mlab(self, scene=None, show=True, is_3d=False,
             `mlab.view()`.
         roll : float
             Roll angle tuple as in mlab.roll().
+        parallel_projection: bool
+            If True, use parallel projection.
         fgcolor : tuple of floats (R, G, B)
             The foreground color, that is the color of all text
             annotation labels (axes, orientation axes, scalar bar