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author | Campbell Barton <ideasman42@gmail.com> | 2011-05-12 10:32:21 +0400 |
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committer | Campbell Barton <ideasman42@gmail.com> | 2011-05-12 10:32:21 +0400 |
commit | a131ce066a8ef4730892dbbf58517535e6ca0188 (patch) | |
tree | 5f4d54af7705bbd7a733b582ac822c3ab5cef30e /release | |
parent | 910220be47729d6effffb7aa33bfe05d4caa5d3d (diff) |
python utility module for converting between 2d/3d region/world coordinates.
Diffstat (limited to 'release')
-rw-r--r-- | release/scripts/modules/view3d_utils.py | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/release/scripts/modules/view3d_utils.py b/release/scripts/modules/view3d_utils.py new file mode 100644 index 00000000000..a4e05e7e1c0 --- /dev/null +++ b/release/scripts/modules/view3d_utils.py @@ -0,0 +1,93 @@ +# ##### BEGIN GPL LICENSE BLOCK ##### +# +# This program is free software; you can redistribute it and/or +# modify it under the terms of the GNU General Public License +# as published by the Free Software Foundation; either version 2 +# of the License, or (at your option) any later version. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program; if not, write to the Free Software Foundation, +# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. +# +# ##### END GPL LICENSE BLOCK ##### + +# <pep8 compliant> + + +def region_2d_to_vector_3d(region, rv3d, coord): + """ + Return a direction vector from the viewport at the spesific 2d region + coordinate. + + :arg region: region of the 3D viewport, typically bpy.context.region. + :type region: :class:`Region` + :arg rv3d: 3D region data, typically bpy.context.space_data.region_3d. + :type rv3d: :class:`RegionView3D` + :arg coord: 2d coordinates relative to the region; + (event.mouse_region_x, event.mouse_region_y) for example. + :type coord: 2d vector + :return: normalized 3d vector. + :rtype: :class:`Vector` + """ + from mathutils import Vector + + dx = (2.0 * coord[0] / region.width) - 1.0 + dy = (2.0 * coord[1] / region.height) - 1.0 + + 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() + + +def region_2d_to_location_3d(region, rv3d, coord, depth_location): + """ + Return a 3d location from the region relative 2d coords, aligned with + *depth_location*. + + :arg region: region of the 3D viewport, typically bpy.context.region. + :type region: :class:`Region` + :arg rv3d: 3D region data, typically bpy.context.space_data.region_3d. + :type rv3d: :class:`RegionView3D` + :arg coord: 2d coordinates relative to the region; + (event.mouse_region_x, event.mouse_region_y) for example. + :type coord: 2d vector + :arg depth_location: the returned vectors depth is aligned with this since + there is no defined depth with a 2d region input. + :type depth_location: 3d vector + :return: normalized 3d vector. + :rtype: :class:`Vector` + """ + from mathutils.geometry import intersect_point_line + origin_start = rv3d.view_matrix.inverted()[3].to_3d() + origin_end = origin_start + region_2d_to_vector_3d(region, rv3d, coord) + return intersect_point_line(depth_vector, origin_start, origin_end)[0] + + +def location_3d_to_region_2d(region, rv3d, coord): + """ + Return the *region* relative 2d location of a 3d position. + + :arg region: region of the 3D viewport, typically bpy.context.region. + :type region: :class:`Region` + :arg rv3d: 3D region data, typically bpy.context.space_data.region_3d. + :type rv3d: :class:`RegionView3D` + :arg coord: 3d worldspace location. + :type coord: 3d vector + :return: 2d location + :rtype: :class:`Vector` + """ + prj = Vector((coord[0], coord[1], coord[2], 1.0)) * rv3d.perspective_matrix + if prj.w > 0.0: + width_half = region.width / 2.0 + height_half = region.height / 2.0 + + return Vector((width_half + width_half * (prj.x / prj.w), + height_half + height_half * (prj.y / prj.w), + )) + else: + return None |