io_shape_mdd/import_mdd.py

   1 # SPDX-License-Identifier: GPL-2.0-or-later
   2
   3 # mdd importer by Bill L.Nieuwendorp
   4 # conversion to blender 2.5: Ivo Grigull (loolarge)
   5 #
   6 # Warning if the vertex order or vertex count differs from the
   7 # origonal model the mdd was Baked out from their will be Strange
   8 # behavior
   9 #
  10 # vertex animation to ShapeKeys with ipo  and gives the frame a value of 1.0
  11 # A modifier to read mdd files would be Ideal but that's for another day :)
  12 #
  13 # Please send any fixes,updates,bugs to Slow67_at_Gmail.com
  14 # Bill Niewuendorp
  15
  16 import bpy
  17 from struct import unpack
  18
  19 def set_linear_interpolation(obj, shapekey):
  20     anim_data = obj.data.shape_keys.animation_data
  21     data_path = "key_blocks[\"" + shapekey.name + "\"].value"
  22
  23     for fcu in anim_data.action.fcurves:
  24         if fcu.data_path == data_path:
  25             for keyframe in fcu.keyframe_points:
  26                 keyframe.interpolation = 'LINEAR'
  27
  28
  29 def obj_update_frame(file, scene, obj, start, fr, step):
  30
  31     # Insert new shape key
  32     new_shapekey = obj.shape_key_add()
  33     new_shapekey.name = ("frame_%.4d" % fr)
  34     new_shapekey_index = len(obj.data.shape_keys.key_blocks) - 1
  35
  36     obj.active_shape_key_index = new_shapekey_index
  37     obj.show_only_shape_key = True
  38
  39     verts = new_shapekey.data
  40
  41     for v in verts:  # 12 is the size of 3 floats
  42         v.co[:] = unpack('>3f', file.read(12))
  43
  44     # me.update()
  45     obj.show_only_shape_key = False
  46
  47     # insert keyframes
  48     new_shapekey = obj.data.shape_keys.key_blocks[new_shapekey_index]
  49     frame = start + fr*step
  50
  51     new_shapekey.value = 0.0
  52     new_shapekey.keyframe_insert("value", frame=frame - step)
  53
  54     new_shapekey.value = 1.0
  55     new_shapekey.keyframe_insert("value", frame=frame)
  56
  57     new_shapekey.value = 0.0
  58     new_shapekey.keyframe_insert("value", frame=frame + step)
  59
  60     set_linear_interpolation(obj, new_shapekey)
  61
  62     obj.data.update()
  63
  64
  65 def load(context, filepath, frame_start=0, frame_step=1):
  66
  67     scene = context.scene
  68     obj = context.object
  69
  70     print('\n\nimporting mdd %r' % filepath)
  71
  72     if bpy.ops.object.mode_set.poll():
  73         bpy.ops.object.mode_set(mode='OBJECT')
  74
  75     file = open(filepath, 'rb')
  76     frames, points = unpack(">2i", file.read(8))
  77     time = unpack((">%df" % frames), file.read(frames * 4))
  78
  79     print('\tpoints:%d frames:%d' % (points, frames))
  80     print('\tstart frame:%d step:%d' % (frame_start, frame_step))
  81
  82     # If target object doesn't have Basis shape key, create it.
  83     if not obj.data.shape_keys:
  84         basis = obj.shape_key_add()
  85         basis.name = "Basis"
  86         obj.data.update()
  87
  88     for i in range(frames):
  89         obj_update_frame(file, scene, obj, frame_start, i, frame_step)
  90
  91     return {'FINISHED'}