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new function: bpy.extras.view3d_utils.region_2d_to_origin_3d()

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useful for doing ray casts from the view.
This commit is contained in:
Campbell Barton 2012-07-01 08:06:01 +00:00
parent 9454015289
commit b0dedf3d3f
1 changed files with 39 additions and 12 deletions
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51
release/scripts/modules/bpy_extras/view3d_utils.py
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@ -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 @@ def region_2d_to_vector_3d(region, rv3d, coord):
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 @@ def region_2d_to_location_3d(region, rv3d, coord, depth_location):
"""
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 @@ def region_2d_to_location_3d(region, rv3d, coord, depth_location):
)
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,