Added support for orthographic camera.

The FEdgeXDetector class for silhouette edge detection and the
ViewMapBuilder class for view map creation are enhanced.  All changes
are related to view point handling (i.e., the camera location).  In
the perspective projection, the visibility of feature edges and edge
types (e.g., borders and crease lines) are computed based on a fixed
view point, whereas the view point in the orthographic projection is
an arbitrary point on the XY plane at the origin and is determined so
that a line segment from the view point to a point in the 3D space is
perpendicular to the XY plane.  All view point related portions of the
class definitions were modified so as to deal with the two different
camera modes.

1 files changed, 2 insertions, 0 deletions

diff --git a/source/blender/freestyle/intern/view_map/ViewMapBuilder.h b/source/blender/freestyle/intern/view_map/ViewMapBuilder.h
index 5ac100bae15..aad9aa245b7 100755
--- a/source/blender/freestyle/intern/view_map/ViewMapBuilder.h
+++ b/source/blender/freestyle/intern/view_map/ViewMapBuilder.h
@@ -58,6 +58,7 @@ private:
   //SilhouetteGeomEngine _GeomEngine;
   ProgressBar *_pProgressBar;
   Vec3r _viewpoint;
+  bool _orthographicProjection;
   Grid* _Grid;
   ViewEdgeXBuilder *_pViewEdgeBuilder;
   bool _EnableQI;
@@ -129,6 +130,7 @@ public:
 			   real iFocalLength,
 			   real iAspect,
 			   real iFovy) {
+	_orthographicProjection = (iProjectionMatrix[3][3] != 0.0);
     SilhouetteGeomEngine::setTransform(iModelViewMatrix, iProjectionMatrix, iViewport, iFocalLength);
   }