Export multiple .MDD at once?

Question

I have 97 MDD files created from different meshes (armature deformed, cloth deformed etc). Is there a way to select multiple meshes and export them as individual MDD files?

I have seen that there's another post which provides an add-on to export selected objects to FBX, but unfortunately I do not have the skills adapting it to work for MDD files: Exporting multiple meshes individually at once

My progress so far: I've found someone trying to export multiple MDD at once on another forum, and it seems that there's a Python command line to export a MDD: bpy.ops.export_shape.mdd(fps=24, frame_start=1, frame_end=250). Also, there's a python template for Batch exporting:

import bpy
import os
export to blend file location
basedir = os.path.dirname(bpy.data.filepath)
if not basedir:
    raise Exception("Blend file is not saved")
view_layer = bpy.context.view_layer
obj_active = view_layer.objects.active
selection = bpy.context.selected_objects
bpy.ops.object.select_all(action='DESELECT')
for obj in selection:
obj.select_set(True)

# some exporters only use the active object
view_layer.objects.active = obj

name = bpy.path.clean_name(obj.name)
fn = os.path.join(basedir, name)

bpy.ops.export_scene.fbx(filepath=fn + ".fbx", use_selection=True)

# Can be used for multiple formats
# bpy.ops.export_scene.x3d(filepath=fn + ".x3d", use_selection=True)

obj.select_set(False)

print("written:", fn)



view_layer.objects.active = obj_active
for obj in selection:
    obj.select_set(True)

How can I export multiple .MDD files ?

Answer 1

Addon based on this answer, adapted to export all objects in selection to single .mdd files. Make sure 'NewTekk MDD format' add-on is enabled and install the add-on as usual:

batch_mdd_export.py

# ##### BEGIN GPL LICENSE BLOCK #####
#
#  This program is free software; you can redistribute it and/or
#  modify it under the terms of the GNU General Public License
#  as published by the Free Software Foundation; either version 2
#  of the License, or (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public License
#  along with this program; if not, write to the Free Software Foundation,
#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
#
# ##### END GPL LICENSE BLOCK #####
# <pep8 compliant>
​
bl_info = {
    "name": "Batch export MDD files",
    "author": "brockmann",
    "version": (0, 1, 0),
    "blender": (2, 80, 0),
    "location": "File > Import-Export",
    "description": "Batch Export Objects in Selection to MDD",
    "warning": "",
    "wiki_url": "",
    "tracker_url": "",
    "category": "Import-Export"}
​
​
import bpy
import os
​
from bpy_extras.io_utils import ExportHelper
​
from bpy.props import (BoolProperty,
                       FloatProperty,
                       IntProperty,
                       StringProperty,
                       EnumProperty,
                       CollectionProperty
                       )
​
​
class Batch_MDD_Export(bpy.types.Operator, ExportHelper):
    """Batch export objects to fbx files"""
    bl_idname = "export_scene.batch_mdd"
    bl_label = "Batch export MDD"
    bl_options = {'PRESET', 'UNDO'}
​
    # ExportHelper mixin class uses this
    filename_ext = ".mdd"
​
    filter_glob : StringProperty(
            default="*.mdd",
            options={'HIDDEN'},
            )
​
    # List of operator properties, the attributes will be assigned
    # to the class instance from the operator setting before calling.
# Context group
use_selection_setting: BoolProperty(
        name=&quot;Selection Only&quot;,
        description=&quot;Export selected objects only&quot;,
        default=True,
        )

​
    use_rest_frame: BoolProperty(
            name="Use Rest Frame",
            description="ToDo",
            default=False,
            )
frames_per_second: FloatProperty(
        name=&quot;FPS&quot;,
        description=&quot;ToDo&quot;,
        min=1, max=60,
        default=25,
        )

​
    frame_start: IntProperty(
            name="Frame Start",
            description="ToDo",
            default=1,
            )
frame_end: IntProperty(
        name=&quot;Frame End&quot;,
        description=&quot;ToDo&quot;,
        default=250,
        )

def execute(self, context):                

​
        # get the folder
        folder_path = os.path.dirname(self.filepath)
​
        # get objects selected in the viewport
        viewport_selection = context.selected_objects
​
        # get export objects
        obj_export_list = viewport_selection
        if self.use_selection_setting == False:
            obj_export_list = [i for i in context.scene.objects]
​
        # deselect all objects
        bpy.ops.object.select_all(action='DESELECT')
​
        for item in obj_export_list:
            item.select_set(True)
            if item.type == 'MESH':
                context.view_layer.objects.active = item # Set active object
                file_path = os.path.join(folder_path, "{}.mdd".format(item.name))
​
                # MDD settings
                bpy.ops.export_shape.mdd(
                        filepath=file_path,
                        fps=self.frames_per_second,
                        frame_start=self.frame_start,
                        frame_end=self.frame_end
                        )
​
            item.select_set(False)
​
        # restore viewport selection
        for ob in viewport_selection:
            ob.select_set(True)
​
        return {'FINISHED'}
​
​
Only needed if you want to add into a dynamic menu
def menu_func_import(self, context):
    self.layout.operator(Batch_MDD_Export.bl_idname, text="MDD Batch Export (.mdd)")
​
​
def register():
    bpy.utils.register_class(Batch_MDD_Export)
    bpy.types.TOPBAR_MT_file_export.append(menu_func_import)
​
​
def unregister():
    bpy.utils.unregister_class(Batch_MDD_Export)
    bpy.types.TOPBAR_MT_file_export.remove(menu_func_import)
​
​
if name == "main":
    register()
​
    # test call
    #bpy.ops.export_scene.batch_mdd('INVOKE_DEFAULT')

I added all possible arguments of the 'lightwave point cache' operator export_shape.mdd(), see line 117. You can change them or add new properties to the operator, wasn't sure.