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add python access to mathutils.intersect_line_plane, update view3d_utils module to use it.

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Campbell Barton
2011-05-19 04:28:09 +00:00
parent 391dbde03d
commit 32793a1395
2 changed files with 69 additions and 19 deletions
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33
release/scripts/modules/bpy_extras/view3d_utils.py
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@@ -19,17 +19,6 @@
# <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
@@ -47,13 +36,13 @@ def region_2d_to_vector_3d(region, rv3d, coord):
"""
from mathutils import Vector
persmat = rv3d.perspective_matrix.copy()
viewvec = rv3d.view_matrix.inverted()[2].xyz.normalized()
if _is_persp_matrix(persmat):
if rv3d.is_perspective:
dx = (2.0 * coord[0] / region.width) - 1.0
dy = (2.0 * coord[1] / region.height) - 1.0
persmat = rv3d.perspective_matrix.copy()
perspinv_x, perspinv_y = persmat.inverted().to_3x3()[0:2]
return ((perspinv_x * dx + perspinv_y * dy) - viewvec).normalized()
else:
@@ -78,22 +67,28 @@ def region_2d_to_location_3d(region, rv3d, coord, depth_location):
: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
if _is_persp_matrix(persmat):
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 + region_2d_to_vector_3d(region, rv3d, coord)
return intersect_point_line(depth_location, origin_start, origin_end)[0]
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):