Blender Every Shape Key On Every Frame.py

"""
Copyright (c) [2/21/24] [Dieton]

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EveryShapeKeyEveryFrame Blender Script

Description:
This script automates the process of creating an animation in Blender where each frame corresponds to a different blend shape (shape key). It sets the value of the current shape key to 1.0 and all other shape keys to 0.0 on each frame, creating a abrupt transition between different blend shapes.

Usage:
1. Select the object with shape keys.
2. Run the script in Blender's Text Editor.
3. The animation will be created starting from frame 1.

"""

import bpy

def create_blend_shape_animation(obj):
    # Check if the object has shape keys
    if obj and obj.type == 'MESH' and obj.data.shape_keys:
        # Set the start frame
        start_frame = 1
        bpy.context.scene.frame_set(start_frame)

        # Iterate through all shape keys
        for i, shape_key in enumerate(obj.data.shape_keys.key_blocks):
            # Set the value of the current shape key to 1.0
            shape_key.value = 1.0

            # Insert a keyframe for the shape key's value
            shape_key.keyframe_insert(data_path="value", frame=bpy.context.scene.frame_current)

            # Reset the shape key value to 0.0 for all other shape keys
            for other_key in obj.data.shape_keys.key_blocks:
                if other_key != shape_key:
                    other_key.value = 0.0
                    other_key.keyframe_insert(data_path="value", frame=bpy.context.scene.frame_current)

            # Go to the next frame
            bpy.context.scene.frame_set(bpy.context.scene.frame_current + 1)

        # Set the end frame
        bpy.context.scene.frame_end = bpy.context.scene.frame_current

# Get the active object
active_object = bpy.context.active_object

# Call the function to create the blend shape animation
create_blend_shape_animation(active_object)