Mapping an algorithm to an animation

Question

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?

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

filename='C:\\dev\\finger_shape.txt'

for line in open(filename):
    line=line.rstrip("\n")
    # 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(" ")
        obj,value=obj_key.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')

Result:

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

• Is there a way to batch render multiple scenes?
• Blender rendering automation (build script)

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

• https://stackoverflow.com/questions/1912434/how-do-i-parse-xml-in-python