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# SPDX-License-Identifier: GPL-2.0-or-later
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from mathutils import Vector
from mathutils.geometry import intersect_point_line
def depth_get(co, ray_start, ray_dir):
dvec = co - ray_start
return dvec.dot(ray_dir)
def region_2d_to_orig_and_view_vector(region, rv3d, coord):
viewinv = rv3d.view_matrix.inverted_safe()
persinv = rv3d.perspective_matrix.inverted_safe()
dx = (2.0 * coord[0] / region.width) - 1.0
dy = (2.0 * coord[1] / region.height) - 1.0
if rv3d.is_perspective:
origin_start = viewinv.translation.copy()
out = Vector((dx, dy, -0.5))
w = out.dot(persinv[3].xyz) + persinv[3][3]
view_vector = ((persinv @ out) / w) - origin_start
else:
view_vector = -viewinv.col[2].xyz
origin_start = ((persinv.col[0].xyz * dx) +
(persinv.col[1].xyz * dy) +
viewinv.translation)
view_vector.normalize()
return view_vector, origin_start
def project_co_v3(sctx, co):
proj_co = sctx.proj_mat @ co.to_4d()
try:
proj_co.xy /= proj_co.w
except Exception as e:
print(e)
win_half = sctx.winsize * 0.5
proj_co[0] = (proj_co[0] + 1.0) * win_half[0]
proj_co[1] = (proj_co[1] + 1.0) * win_half[1]
return proj_co.xy
def intersect_boundbox_threshold(sctx, MVP, ray_origin_local, ray_direction_local, bbmin, bbmax):
local_bvmin = Vector()
local_bvmax = Vector()
tmin = Vector()
tmax = Vector()
if (ray_direction_local[0] < 0.0):
local_bvmin[0] = bbmax[0]
local_bvmax[0] = bbmin[0]
else:
local_bvmin[0] = bbmin[0]
local_bvmax[0] = bbmax[0]
if (ray_direction_local[1] < 0.0):
local_bvmin[1] = bbmax[1]
local_bvmax[1] = bbmin[1]
else:
local_bvmin[1] = bbmin[1]
local_bvmax[1] = bbmax[1]
if (ray_direction_local[2] < 0.0):
local_bvmin[2] = bbmax[2]
local_bvmax[2] = bbmin[2]
else:
local_bvmin[2] = bbmin[2]
local_bvmax[2] = bbmax[2]
if (ray_direction_local[0]):
tmin[0] = (local_bvmin[0] - ray_origin_local[0]) / ray_direction_local[0]
tmax[0] = (local_bvmax[0] - ray_origin_local[0]) / ray_direction_local[0]
else:
tmin[0] = sctx.depth_range[0]
tmax[0] = sctx.depth_range[1]
if (ray_direction_local[1]):
tmin[1] = (local_bvmin[1] - ray_origin_local[1]) / ray_direction_local[1]
tmax[1] = (local_bvmax[1] - ray_origin_local[1]) / ray_direction_local[1]
else:
tmin[1] = sctx.depth_range[0]
tmax[1] = sctx.depth_range[1]
if (ray_direction_local[2]):
tmin[2] = (local_bvmin[2] - ray_origin_local[2]) / ray_direction_local[2]
tmax[2] = (local_bvmax[2] - ray_origin_local[2]) / ray_direction_local[2]
else:
tmin[2] = sctx.depth_range[0]
tmax[2] = sctx.depth_range[1]
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# `va` and `vb` are the coordinates of the AABB edge closest to the ray #
va = Vector()
vb = Vector()
# `rtmin` and `rtmax` are the minimum and maximum distances of the ray hits on the AABB #
if ((tmax[0] <= tmax[1]) and (tmax[0] <= tmax[2])):
rtmax = tmax[0]
va[0] = vb[0] = local_bvmax[0]
main_axis = 3
elif ((tmax[1] <= tmax[0]) and (tmax[1] <= tmax[2])):
rtmax = tmax[1]
va[1] = vb[1] = local_bvmax[1]
main_axis = 2
else:
rtmax = tmax[2]
va[2] = vb[2] = local_bvmax[2]
main_axis = 1
if ((tmin[0] >= tmin[1]) and (tmin[0] >= tmin[2])):
rtmin = tmin[0]
va[0] = vb[0] = local_bvmin[0]
main_axis -= 3
elif ((tmin[1] >= tmin[0]) and (tmin[1] >= tmin[2])):
rtmin = tmin[1]
va[1] = vb[1] = local_bvmin[1]
main_axis -= 1
else:
rtmin = tmin[2]
va[2] = vb[2] = local_bvmin[2]
main_axis -= 2
if (main_axis < 0):
main_axis += 3
# ifdef IGNORE_BEHIND_RAY
depth_max = depth_get(local_bvmax, ray_origin_local, ray_direction_local)
if (depth_max < sctx.depth_range[0]):
return False
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if (rtmin <= rtmax):
# if rtmin < rtmax, ray intersect `AABB` #
return True
if (ray_direction_local[main_axis] < 0.0):
va[main_axis] = local_bvmax[main_axis]
vb[main_axis] = local_bvmin[main_axis]
else:
va[main_axis] = local_bvmin[main_axis]
vb[main_axis] = local_bvmax[main_axis]
win_half = sctx.winsize * 0.5
scale = abs(local_bvmax[main_axis] - local_bvmin[main_axis])
va2d = Vector((
(MVP[0].xyz.dot(va) + MVP[0][3]),
(MVP[1].xyz.dot(va) + MVP[1][3]),
))
vb2d = Vector((
(va2d[0] + MVP[0][main_axis] * scale),
(va2d[1] + MVP[1][main_axis] * scale),
))
depth_a = MVP[3].xyz.dot(va) + MVP[3][3]
depth_b = depth_a + MVP[3][main_axis] * scale
va2d /= depth_a
vb2d /= depth_b
va2d[0] = (va2d[0] + 1.0) * win_half[0]
va2d[1] = (va2d[1] + 1.0) * win_half[1]
vb2d[0] = (vb2d[0] + 1.0) * win_half[0]
vb2d[1] = (vb2d[1] + 1.0) * win_half[1]
p, fac = intersect_point_line(sctx.mval, va2d, vb2d)
if fac < 0.0:
return (sctx.mval - va2d).length_squared < sctx._dist_px_sq
elif fac > 1.0:
return (sctx.mval - vb2d).length_squared < sctx._dist_px_sq
else:
return (sctx.mval - p).length_squared < sctx._dist_px_sq
def intersect_ray_segment_fac(v0, v1, ray_direction, ray_origin):
a = v1 - v0
t = v0 - ray_origin
n = a.cross(ray_direction)
nlen = n.length_squared
# if (nlen == 0.0f) the lines are parallel, has no nearest point, only distance squared.*/
if nlen == 0.0:
# Calculate the distance to the nearest point to origin then #
return a.dot(ray_direction) < 0
else:
c = n - t
cray = c.cross(ray_direction)
return cray.dot(n) / nlen