io_shape_mdd/import_mdd.py

   1 # SPDX-FileCopyrightText: 2011-2022 Blender Foundation
   2 #
   3 # SPDX-License-Identifier: GPL-2.0-or-later
   4
   5 # mdd importer by Bill L.Nieuwendorp
   6 # conversion to blender 2.5: Ivo Grigull (loolarge)
   7 #
   8 # Warning if the vertex order or vertex count differs from the
   9 # origonal model the mdd was Baked out from their will be Strange
  10 # behavior
  11 #
  12 # vertex animation to ShapeKeys with ipo  and gives the frame a value of 1.0
  13 # A modifier to read mdd files would be Ideal but that's for another day :)
  14 #
  15 # Please send any fixes,updates,bugs to Slow67_at_Gmail.com
  16 # Bill Niewuendorp
  17
  18 import bpy
  19 from struct import unpack
  20
  21 def set_linear_interpolation(obj, shapekey):
  22     anim_data = obj.data.shape_keys.animation_data
  23     data_path = "key_blocks[\"" + shapekey.name + "\"].value"
  24
  25     for fcu in anim_data.action.fcurves:
  26         if fcu.data_path == data_path:
  27             for keyframe in fcu.keyframe_points:
  28                 keyframe.interpolation = 'LINEAR'
  29
  30
  31 def obj_update_frame(file, scene, obj, start, fr, step):
  32
  33     # Insert new shape key
  34     new_shapekey = obj.shape_key_add()
  35     new_shapekey.name = ("frame_%.4d" % fr)
  36     new_shapekey_index = len(obj.data.shape_keys.key_blocks) - 1
  37
  38     obj.active_shape_key_index = new_shapekey_index
  39     obj.show_only_shape_key = True
  40
  41     verts = new_shapekey.data
  42
  43     for v in verts:  # 12 is the size of 3 floats
  44         v.co[:] = unpack('>3f', file.read(12))
  45
  46     # me.update()
  47     obj.show_only_shape_key = False
  48
  49     # insert keyframes
  50     new_shapekey = obj.data.shape_keys.key_blocks[new_shapekey_index]
  51     frame = start + fr*step
  52
  53     new_shapekey.value = 0.0
  54     new_shapekey.keyframe_insert("value", frame=frame - step)
  55
  56     new_shapekey.value = 1.0
  57     new_shapekey.keyframe_insert("value", frame=frame)
  58
  59     new_shapekey.value = 0.0
  60     new_shapekey.keyframe_insert("value", frame=frame + step)
  61
  62     set_linear_interpolation(obj, new_shapekey)
  63
  64     obj.data.update()
  65
  66
  67 def load(context, filepath, frame_start=0, frame_step=1):
  68
  69     scene = context.scene
  70     obj = context.object
  71
  72     print('\n\nimporting mdd %r' % filepath)
  73
  74     if bpy.ops.object.mode_set.poll():
  75         bpy.ops.object.mode_set(mode='OBJECT')
  76
  77     file = open(filepath, 'rb')
  78     frames, points = unpack(">2i", file.read(8))
  79     time = unpack((">%df" % frames), file.read(frames * 4))
  80
  81     print('\tpoints:%d frames:%d' % (points, frames))
  82     print('\tstart frame:%d step:%d' % (frame_start, frame_step))
  83
  84     # If target object doesn't have Basis shape key, create it.
  85     if not obj.data.shape_keys:
  86         basis = obj.shape_key_add()
  87         basis.name = "Basis"
  88         obj.data.update()
  89
  90     for i in range(frames):
  91         obj_update_frame(file, scene, obj, frame_start, i, frame_step)
  92
  93     return {'FINISHED'}