I have written an algorithm that can compute fingering of piano scores.

Now I would like to have a 3D animation of a pair of hands playing this score. Each finger is already assigned to a key.

How could I use blender api for this. If it is possible at all?

  • $\begingroup$ Can you elaborate some more. How do you envision this workflow to go? Should it be all automatic (maybe the best if you plan to animate long or many scores). Is it ok if there are some manual steps? $\endgroup$
    – Gunslinger
    Dec 7, 2013 at 21:47
  • $\begingroup$ There should not be any manual steps. So basically, it should be able to operate command line. Input a musicXml with fingering information -> output animation $\endgroup$
    – dorien
    Dec 7, 2013 at 21:55
  • 3
    $\begingroup$ @dorien Have a look at the python API reference $\endgroup$
    – gandalf3
    Dec 8, 2013 at 1:30
  • $\begingroup$ Seems to me this would be ideal for the game engine. $\endgroup$
    – iKlsR
    Dec 11, 2013 at 17:45
  • $\begingroup$ @dorien Had you any problems to adapt the script below? $\endgroup$
    – stacker
    Dec 13, 2013 at 9:33

1 Answer 1


Here is a very basic example of what you're trying to achieve:

A control file holds some data in the format Frame-no obj_name,value of 'Key 1' I have only created 2 shape keys (basic and 'Key 1') to test the script.

1 Finger1,1
1 Finger2,1
1 Finger3,1
1 Finger4,1
10 Finger1,.5
20 Finger2,.5
30 Finger3,.5
40 Finger4,.5
50 Finger1,1

The python script reads the control file and adds keyframes for each line

import bpy


for line in open(filename):
    # Only append lines that have space in them.
    if line.find(" ") != -1 and line.find("#") == -1:
        # Split non comment lines of the format: Frame-no obj_name:value of 'Key 1'
        frame,obj_key= line.split(" ")
        bpy.context.scene.frame_set( int( frame ))
        bpy.context.scene.objects.active = bpy.data.objects[ obj ]
        bpy.context.object.data.shape_keys.key_blocks['Key 1'].value = float(value)
        bpy.context.object.data.shape_keys.key_blocks['Key 1'].keyframe_insert('value')


enter image description here

Regarding you comments on automatise the rendering you might find these posts interesting:

Parsing XML is not blender related but you should find examaples on SO:


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