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# SPDX-License-Identifier: Apache-2.0
# Copyright 2018-2021 The glTF-Blender-IO authors.
import typing
import math
from mathutils import Matrix, Vector, Quaternion, Euler
from io_scene_gltf2.blender.com.gltf2_blender_data_path import get_target_property_name
def list_to_mathutils(values: typing.List[float], data_path: str) -> typing.Union[Vector, Quaternion, Euler]:
"""Transform a list to blender py object."""
target = get_target_property_name(data_path)
if target == 'delta_location':
return Vector(values) # TODO Should be Vector(values) - Vector(something)?
elif target == 'delta_rotation_euler':
return Euler(values).to_quaternion() # TODO Should be Euler(values).to_quaternion() @ something?
elif target == 'location':
return Vector(values)
elif target == 'rotation_axis_angle':
angle = values[0]
axis = values[1:]
return Quaternion(axis, math.radians(angle))
elif target == 'rotation_euler':
return Euler(values).to_quaternion()
elif target == 'rotation_quaternion':
return Quaternion(values)
elif target == 'scale':
return Vector(values)
elif target == 'value':
return Vector(values)
return values
def mathutils_to_gltf(x: typing.Union[Vector, Quaternion]) -> typing.List[float]:
"""Transform a py object to glTF list."""
if isinstance(x, Vector):
return list(x)
if isinstance(x, Quaternion):
# Blender has w-first quaternion notation
return [x[1], x[2], x[3], x[0]]
else:
return list(x)
def to_yup() -> Matrix:
"""Transform to Yup."""
return Matrix(
((1.0, 0.0, 0.0, 0.0),
(0.0, 0.0, 1.0, 0.0),
(0.0, -1.0, 0.0, 0.0),
(0.0, 0.0, 0.0, 1.0))
)
to_zup = to_yup
def swizzle_yup(v: typing.Union[Vector, Quaternion], data_path: str) -> typing.Union[Vector, Quaternion]:
"""Manage Yup."""
target = get_target_property_name(data_path)
swizzle_func = {
"delta_location": swizzle_yup_location,
"delta_rotation_euler": swizzle_yup_rotation,
"location": swizzle_yup_location,
"rotation_axis_angle": swizzle_yup_rotation,
"rotation_euler": swizzle_yup_rotation,
"rotation_quaternion": swizzle_yup_rotation,
"scale": swizzle_yup_scale,
"value": swizzle_yup_value
}.get(target)
if swizzle_func is None:
raise RuntimeError("Cannot transform values at {}".format(data_path))
return swizzle_func(v)
def swizzle_yup_location(loc: Vector) -> Vector:
"""Manage Yup location."""
return Vector((loc[0], loc[2], -loc[1]))
def swizzle_yup_rotation(rot: Quaternion) -> Quaternion:
"""Manage Yup rotation."""
return Quaternion((rot[0], rot[1], rot[3], -rot[2]))
def swizzle_yup_scale(scale: Vector) -> Vector:
"""Manage Yup scale."""
return Vector((scale[0], scale[2], scale[1]))
def swizzle_yup_value(value: typing.Any) -> typing.Any:
"""Manage Yup value."""
return value
def transform(v: typing.Union[Vector, Quaternion], data_path: str, transform: Matrix = Matrix.Identity(4), need_rotation_correction: bool = False) -> typing \
.Union[Vector, Quaternion]:
"""Manage transformations."""
target = get_target_property_name(data_path)
transform_func = {
"delta_location": transform_location,
"delta_rotation_euler": transform_rotation,
"location": transform_location,
"rotation_axis_angle": transform_rotation,
"rotation_euler": transform_rotation,
"rotation_quaternion": transform_rotation,
"scale": transform_scale,
"value": transform_value
}.get(target)
if transform_func is None:
raise RuntimeError("Cannot transform values at {}".format(data_path))
return transform_func(v, transform, need_rotation_correction)
def transform_location(location: Vector, transform: Matrix = Matrix.Identity(4), need_rotation_correction:bool = False) -> Vector:
"""Transform location."""
correction = Quaternion((2**0.5/2, -2**0.5/2, 0.0, 0.0))
m = Matrix.Translation(location)
if need_rotation_correction:
m @= correction.to_matrix().to_4x4()
m = transform @ m
return m.to_translation()
def transform_rotation(rotation: Quaternion, transform: Matrix = Matrix.Identity(4), need_rotation_correction: bool = False) -> Quaternion:
"""Transform rotation."""
rotation.normalize()
correction = Quaternion((2**0.5/2, -2**0.5/2, 0.0, 0.0))
m = rotation.to_matrix().to_4x4()
if need_rotation_correction:
m @= correction.to_matrix().to_4x4()
m = transform @ m
return m.to_quaternion()
def transform_scale(scale: Vector, transform: Matrix = Matrix.Identity(4), need_rotation_correction: bool = False) -> Vector:
"""Transform scale."""
m = Matrix.Identity(4)
m[0][0] = scale.x
m[1][1] = scale.y
m[2][2] = scale.z
m = transform @ m
return m.to_scale()
def transform_value(value: Vector, _: Matrix = Matrix.Identity(4), need_rotation_correction: bool = False) -> Vector:
"""Transform value."""
return value
def round_if_near(value: float, target: float) -> float:
"""If value is very close to target, round to target."""
return value if abs(value - target) > 2.0e-6 else target
def scale_rot_swap_matrix(rot):
"""Returns a matrix m st. Scale[s] Rot[rot] = Rot[rot] Scale[m s].
If rot.to_matrix() is a signed permutation matrix, works for any s.
Otherwise works only if s is a uniform scaling.
"""
m = nearby_signed_perm_matrix(rot) # snap to signed perm matrix
m.transpose() # invert permutation
for i in range(3):
for j in range(3):
m[i][j] = abs(m[i][j]) # discard sign
return m
def nearby_signed_perm_matrix(rot):
"""Returns a signed permutation matrix close to rot.to_matrix().
(A signed permutation matrix is like a permutation matrix, except
the non-zero entries can be ±1.)
"""
m = rot.to_matrix()
x, y, z = m[0], m[1], m[2]
# Set the largest entry in the first row to ±1
a, b, c = abs(x[0]), abs(x[1]), abs(x[2])
i = 0 if a >= b and a >= c else 1 if b >= c else 2
x[i] = 1 if x[i] > 0 else -1
x[(i+1) % 3] = 0
x[(i+2) % 3] = 0
# Same for second row: only two columns to consider now.
a, b = abs(y[(i+1) % 3]), abs(y[(i+2) % 3])
j = (i+1) % 3 if a >= b else (i+2) % 3
y[j] = 1 if y[j] > 0 else -1
y[(j+1) % 3] = 0
y[(j+2) % 3] = 0
# Same for third row: only one column left
k = (0 + 1 + 2) - i - j
z[k] = 1 if z[k] > 0 else -1
z[(k+1) % 3] = 0
z[(k+2) % 3] = 0
return m
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