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#====================== 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>
import math
from mathutils import Vector, Matrix, Color
#=============================================
# Math
#=============================================
def angle_on_plane(plane, vec1, vec2):
""" Return the angle between two vectors projected onto a plane.
"""
plane.normalize()
vec1 = vec1 - (plane * (vec1.dot(plane)))
vec2 = vec2 - (plane * (vec2.dot(plane)))
vec1.normalize()
vec2.normalize()
# Determine the angle
angle = math.acos(max(-1.0, min(1.0, vec1.dot(vec2))))
if angle < 0.00001: # close enough to zero that sign doesn't matter
return angle
# Determine the sign of the angle
vec3 = vec2.cross(vec1)
vec3.normalize()
sign = vec3.dot(plane)
if sign >= 0:
sign = 1
else:
sign = -1
return angle * sign
#=============================================
# Color correction functions
#=============================================
def linsrgb_to_srgb (linsrgb):
"""Convert physically linear RGB values into sRGB ones. The transform is
uniform in the components, so *linsrgb* can be of any shape.
*linsrgb* values should range between 0 and 1, inclusively.
"""
# From Wikipedia, but easy analogue to the above.
gamma = 1.055 * linsrgb**(1./2.4) - 0.055
scale = linsrgb * 12.92
# return np.where (linsrgb > 0.0031308, gamma, scale)
if linsrgb > 0.0031308:
return gamma
return scale
def gamma_correct(color):
corrected_color = Color()
for i, component in enumerate(color):
corrected_color[i] = linsrgb_to_srgb(color[i])
return corrected_color
#=============================================
# Misc
#=============================================
def copy_attributes(a, b):
keys = dir(a)
for key in keys:
if not key.startswith("_") \
and not key.startswith("error_") \
and key != "group" \
and key != "is_valid" \
and key != "rna_type" \
and key != "bl_rna":
try:
setattr(b, key, getattr(a, key))
except AttributeError:
pass
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