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Diffstat (limited to 'release/scripts/modules/bpy_extras/view3d_utils.py')
| -rw-r--r-- | release/scripts/modules/bpy_extras/view3d_utils.py | 128 |
1 files changed, 128 insertions, 0 deletions
diff --git a/release/scripts/modules/bpy_extras/view3d_utils.py b/release/scripts/modules/bpy_extras/view3d_utils.py new file mode 100644 index 00000000000..5796abce72c --- /dev/null +++ b/release/scripts/modules/bpy_extras/view3d_utils.py @@ -0,0 +1,128 @@ +# ##### 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> + +__all__ = ( + "region_2d_to_vector_3d", + "region_2d_to_location_3d", + "location_3d_to_region_2d", +) + + +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 + + if rv3d.is_perspective: + persinv = rv3d.perspective_matrix.inverted() + + out = Vector(((2.0 * coord[0] / region.width) - 1.0, + (2.0 * coord[1] / region.height) - 1.0, + -0.5 + )) + + w = ((out[0] * persinv[0][3]) + + (out[1] * persinv[1][3]) + + (out[2] * persinv[2][3]) + persinv[3][3]) + + return ((persinv * out) / w) - rv3d.view_matrix.inverted()[3].xyz + else: + return rv3d.view_matrix.inverted()[2].xyz.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 import Vector + from mathutils.geometry import intersect_point_line + + persmat = rv3d.perspective_matrix.copy() + coord_vec = region_2d_to_vector_3d(region, rv3d, coord) + depth_location = Vector(depth_location) + + if rv3d.is_perspective: + from mathutils.geometry import intersect_line_plane + + origin_start = rv3d.view_matrix.inverted()[3].to_3d() + origin_end = origin_start + coord_vec + view_vec = rv3d.view_matrix.inverted()[2] + return intersect_line_plane(origin_start, origin_end, depth_location, view_vec, 1) + 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 + coord_vec + return intersect_point_line(depth_location, 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` + """ + from mathutils import Vector + + prj = rv3d.perspective_matrix * Vector((coord[0], coord[1], coord[2], 1.0)) + 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 |