Revision: 48463
http://projects.blender.org/scm/viewvc.php?view=rev&root=bf-blender&revision=48463
Author: campbellbarton
Date: 2012-07-01 08:06:01 +0000 (Sun, 01 Jul 2012)
Log Message:
-----------
new function: bpy.extras.view3d_utils.region_2d_to_origin_3d()
useful for doing ray casts from the view.
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
2012-07-01 07:55:44 UTC (rev 48462)
+++ trunk/blender/release/scripts/modules/bpy_extras/view3d_utils.py
2012-07-01 08:06:01 UTC (rev 48463)
@@ -20,6 +20,7 @@
__all__ = (
"region_2d_to_vector_3d",
+ "region_2d_to_origin_3d",
"region_2d_to_location_3d",
"location_3d_to_region_2d",
)
@@ -58,6 +59,40 @@
return viewinv.col[2].xyz.normalized()
+def region_2d_to_origin_3d(region, rv3d, coord):
+ """
+ Return the 3d view origin from the region relative 2d coords.
+
+ :arg region: region of the 3D viewport, typically bpy.context.region.
+ :type region: :class:`bpy.types.Region`
+ :arg rv3d: 3D region data, typically bpy.context.space_data.region_3d.
+ :type rv3d: :class:`bpy.types.RegionView3D`
+ :arg coord: 2d coordinates relative to the region;
+ (event.mouse_region_x, event.mouse_region_y) for example.
+ :type coord: 2d vector
+ :return: The origin of the viewpoint in 3d space.
+ :rtype: :class:`mathutils.Vector`
+ """
+ from mathutils import Vector
+
+ viewinv = rv3d.view_matrix.inverted()
+
+ if rv3d.is_perspective:
+ from mathutils.geometry import intersect_line_plane
+
+ origin_start = viewinv.translation.copy()
+ else:
+ from mathutils.geometry import intersect_point_line
+ persmat = rv3d.perspective_matrix.copy()
+ dx = (2.0 * coord[0] / region.width) - 1.0
+ dy = (2.0 * coord[1] / region.height) - 1.0
+ persinv = persmat.inverted()
+ origin_start = ((persinv.col[0].xyz * dx) +
+ (persinv.col[1].xyz * dy) +
+ viewinv.translation)
+ return origin_start
+
+
def region_2d_to_location_3d(region, rv3d, coord, depth_location):
"""
Return a 3d location from the region relative 2d coords, aligned with
@@ -78,15 +113,15 @@
"""
from mathutils import Vector
- viewinv = rv3d.view_matrix.inverted()
coord_vec = region_2d_to_vector_3d(region, rv3d, coord)
depth_location = Vector(depth_location)
+ origin_start = region_2d_to_origin_3d(region, rv3d, coord)
+ origin_end = origin_start + coord_vec
+
if rv3d.is_perspective:
from mathutils.geometry import intersect_line_plane
-
- origin_start = viewinv.translation.copy()
- origin_end = origin_start + coord_vec
+ viewinv = rv3d.view_matrix.inverted()
view_vec = viewinv.col[2].copy()
return intersect_line_plane(origin_start,
origin_end,
@@ -95,14 +130,6 @@
)
else:
from mathutils.geometry import intersect_point_line
- persmat = rv3d.perspective_matrix.copy()
- dx = (2.0 * coord[0] / region.width) - 1.0
- dy = (2.0 * coord[1] / region.height) - 1.0
- persinv = persmat.inverted()
- origin_start = ((persinv.col[0].xyz * dx) +
- (persinv.col[1].xyz * dy) +
- viewinv.translation)
- origin_end = origin_start + coord_vec
return intersect_point_line(depth_location,
origin_start,
origin_end,
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