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# SPDX-License-Identifier: GPL-2.0-or-later
""" This script is an exporter to the nuke's .chan files.
It takes the currently active object and writes it's transformation data
into a text file with .chan extension."""
from mathutils import Matrix, Euler
from math import radians, degrees
def save_chan(context, filepath, y_up, rot_ord):
# get the active scene and object
scene = context.scene
obj = context.active_object
camera = obj.data if obj.type == 'CAMERA' else None
# get the range of an animation
f_start = scene.frame_start
f_end = scene.frame_end
# prepare the correcting matrix
rot_mat = Matrix.Rotation(radians(-90.0), 4, 'X').to_4x4()
previous_rotation = Euler()
filehandle = open(filepath, 'w')
fw = filehandle.write
# iterate the frames
for frame in range(f_start, f_end + 1, 1):
# set the current frame
scene.frame_set(frame)
# get the objects world matrix
mat = obj.matrix_world.copy()
# if the setting is proper use the rotation matrix
# to flip the Z and Y axis
if y_up:
mat = rot_mat @ mat
# create the first component of a new line, the frame number
fw("%i\t" % frame)
# create transform component
t = mat.to_translation()
fw("%f\t%f\t%f\t" % t[:])
# create rotation component
r = mat.to_euler(rot_ord, previous_rotation)
fw("%f\t%f\t%f\t" % (degrees(r[0]), degrees(r[1]), degrees(r[2])))
# store previous rotation for compatibility
previous_rotation = r
# if the selected object is a camera export vertical fov also
if camera:
vfov = degrees(camera.angle_y)
fw("%f" % vfov)
fw("\n")
# after the whole loop close the file
filehandle.close()
return {'FINISHED'}
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