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# SPDX-License-Identifier: GPL-2.0-or-later
# <pep8 compliant>
# mdd importer by Bill L.Nieuwendorp
# conversion to blender 2.5: Ivo Grigull (loolarge)
#
# Warning if the vertex order or vertex count differs from the
# origonal model the mdd was Baked out from their will be Strange
# behavior
#
# vertex animation to ShapeKeys with ipo and gives the frame a value of 1.0
# A modifier to read mdd files would be Ideal but that's for another day :)
#
# Please send any fixes,updates,bugs to Slow67_at_Gmail.com
# Bill Niewuendorp
import bpy
from struct import unpack
def set_linear_interpolation(obj, shapekey):
anim_data = obj.data.shape_keys.animation_data
data_path = "key_blocks[\"" + shapekey.name + "\"].value"
for fcu in anim_data.action.fcurves:
if fcu.data_path == data_path:
for keyframe in fcu.keyframe_points:
keyframe.interpolation = 'LINEAR'
def obj_update_frame(file, scene, obj, start, fr, step):
# Insert new shape key
new_shapekey = obj.shape_key_add()
new_shapekey.name = ("frame_%.4d" % fr)
new_shapekey_index = len(obj.data.shape_keys.key_blocks) - 1
obj.active_shape_key_index = new_shapekey_index
obj.show_only_shape_key = True
verts = new_shapekey.data
for v in verts: # 12 is the size of 3 floats
v.co[:] = unpack('>3f', file.read(12))
# me.update()
obj.show_only_shape_key = False
# insert keyframes
new_shapekey = obj.data.shape_keys.key_blocks[new_shapekey_index]
frame = start + fr*step
new_shapekey.value = 0.0
new_shapekey.keyframe_insert("value", frame=frame - step)
new_shapekey.value = 1.0
new_shapekey.keyframe_insert("value", frame=frame)
new_shapekey.value = 0.0
new_shapekey.keyframe_insert("value", frame=frame + step)
set_linear_interpolation(obj, new_shapekey)
obj.data.update()
def load(context, filepath, frame_start=0, frame_step=1):
scene = context.scene
obj = context.object
print('\n\nimporting mdd %r' % filepath)
if bpy.ops.object.mode_set.poll():
bpy.ops.object.mode_set(mode='OBJECT')
file = open(filepath, 'rb')
frames, points = unpack(">2i", file.read(8))
time = unpack((">%df" % frames), file.read(frames * 4))
print('\tpoints:%d frames:%d' % (points, frames))
print('\tstart frame:%d step:%d' % (frame_start, frame_step))
# If target object doesn't have Basis shape key, create it.
if not obj.data.shape_keys:
basis = obj.shape_key_add()
basis.name = "Basis"
obj.data.update()
for i in range(frames):
obj_update_frame(file, scene, obj, frame_start, i, frame_step)
return {'FINISHED'}
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