[Bf-blender-cvs] SVN commit: /data/svn/bf-blender [36751] trunk/blender/release/scripts/ modules/bpy_extras/view3d_utils.py: fix for python module region_2d_to_vector_3d and region_2d_to_location_3d functions in ortho mode .

[Campbell Barton]

Revision: 36751
          http://projects.blender.org/scm/viewvc.php?view=rev&root=bf-blender&revision=36751
Author:   campbellbarton
Date:     2011-05-18 15:57:20 +0000 (Wed, 18 May 2011)
Log Message:
-----------
fix for python module region_2d_to_vector_3d and region_2d_to_location_3d functions in ortho mode.

Modified Paths:
--------------
    trunk/blender/release/scripts/modules/bpy_extras/view3d_utils.py

Modified: trunk/blender/release/scripts/modules/bpy_extras/view3d_utils.py
===================================================================
--- trunk/blender/release/scripts/modules/bpy_extras/view3d_utils.py	2011-05-18 15:31:00 UTC (rev 36750)
+++ trunk/blender/release/scripts/modules/bpy_extras/view3d_utils.py	2011-05-18 15:57:20 UTC (rev 36751)
@@ -19,6 +19,17 @@
 # <pep8 compliant>
 
 
+def _is_persp_matrix(persmat, eps=0.00001):
+    """
+    crummy way to check if its a perspective matrix
+    """
+    return not (
+            abs(persmat[0][3]) < eps and \
+            abs(persmat[1][3]) < eps and \
+            abs(persmat[2][3]) < eps and \
+            abs(persmat[3][3] - 1.0) < eps)
+
+
 def region_2d_to_vector_3d(region, rv3d, coord):
     """
     Return a direction vector from the viewport at the spesific 2d region
@@ -36,12 +47,17 @@
     """
     from mathutils import Vector
 
-    dx = (2.0 * coord[0] / region.width) - 1.0
-    dy = (2.0 * coord[1] / region.height) - 1.0
+    persmat = rv3d.perspective_matrix.copy()
+    viewvec = rv3d.view_matrix.inverted()[2].xyz.normalized()
 
-    viewvec = rv3d.view_matrix.inverted()[2].to_3d().normalized()
-    perspinv_x, perspinv_y = rv3d.perspective_matrix.inverted().to_3x3()[0:2]
-    return ((perspinv_x * dx + perspinv_y * dy) - viewvec).normalized()
+    if _is_persp_matrix(persmat):
+        dx = (2.0 * coord[0] / region.width) - 1.0
+        dy = (2.0 * coord[1] / region.height) - 1.0
+        
+        perspinv_x, perspinv_y = persmat.inverted().to_3x3()[0:2]
+        return ((perspinv_x * dx + perspinv_y * dy) - viewvec).normalized()
+    else:
+        return viewvec
 
 
 def region_2d_to_location_3d(region, rv3d, coord, depth_location):
@@ -63,8 +79,20 @@
     :rtype: :class:`Vector`
     """
     from mathutils.geometry import intersect_point_line
-    origin_start = rv3d.view_matrix.inverted()[3].to_3d()
+
+    persmat = rv3d.perspective_matrix.copy()
+
+    if _is_persp_matrix(persmat):
+        origin_start = rv3d.view_matrix.inverted()[3].to_3d()
+    else:
+        dx = (2.0 * coord[0] / region.width) - 1.0
+        dy = (2.0 * coord[1] / region.height) - 1.0
+        persinv = persmat.inverted()
+        viewinv = rv3d.view_matrix.inverted()
+        origin_start = (persinv[0].xyz * dx) + (persinv[1].xyz * dy) + viewinv[3].xyz
+
     origin_end = origin_start + region_2d_to_vector_3d(region, rv3d, coord)
+    
     return intersect_point_line(depth_location, origin_start, origin_end)[0]