io_anim_nuke_chan/export_nuke_chan.py

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