io_anim_nuke_chan/export_nuke_chan.py

   1 # SPDX-FileCopyrightText: 2011-2022 Blender Foundation
   2 #
   3 # SPDX-License-Identifier: GPL-2.0-or-later
   4
   5 """ This script is an exporter to the nuke's .chan files.
   6 It takes the currently active object and writes it's transformation data
   7 into a text file with .chan extension."""
   8
   9 from mathutils import Matrix, Euler
  10 from math import radians, degrees
  11
  12
  13 def save_chan(context, filepath, y_up, rot_ord):
  14
  15     # get the active scene and object
  16     scene = context.scene
  17     obj = context.active_object
  18     camera = obj.data if obj.type == 'CAMERA' else None
  19
  20     # get the range of an animation
  21     f_start = scene.frame_start
  22     f_end = scene.frame_end
  23
  24     # prepare the correcting matrix
  25     rot_mat = Matrix.Rotation(radians(-90.0), 4, 'X').to_4x4()
  26     previous_rotation = Euler()
  27
  28     filehandle = open(filepath, 'w')
  29     fw = filehandle.write
  30
  31     # iterate the frames
  32     for frame in range(f_start, f_end + 1, 1):
  33
  34         # set the current frame
  35         scene.frame_set(frame)
  36
  37         # get the objects world matrix
  38         mat = obj.matrix_world.copy()
  39
  40         # if the setting is proper use the rotation matrix
  41         # to flip the Z and Y axis
  42         if y_up:
  43             mat = rot_mat @ mat
  44
  45         # create the first component of a new line, the frame number
  46         fw("%i\t" % frame)
  47
  48         # create transform component
  49         t = mat.to_translation()
  50         fw("%f\t%f\t%f\t" % t[:])
  51
  52         # create rotation component
  53         r = mat.to_euler(rot_ord, previous_rotation)
  54
  55         fw("%f\t%f\t%f\t" % (degrees(r[0]), degrees(r[1]), degrees(r[2])))
  56
  57         # store previous rotation for compatibility
  58         previous_rotation = r
  59
  60         # if the selected object is a camera export vertical fov also
  61         if camera:
  62             vfov = degrees(camera.angle_y)
  63             fw("%f" % vfov)
  64
  65         fw("\n")
  66
  67     # after the whole loop close the file
  68     filehandle.close()
  69
  70     return {'FINISHED'}