Adding a driver function to the driver namespace

Coding Python Support
1

I understand how I can define a driver function and add it to the driver namespace:


 
import bpy

def driverFunc(val):

    return val * val    # return val squared

bpy.app.driver_namespace['driverFunc'] = driverFunc    # add function to driver_namespace

How can I execute this script when loading the blend file? This would be required to use the newly defined function in a scripted expression of a driver. I don’t want to put it into the startup script as that would make it available to all blend files, but only on this installation, which prohibits distirbution of the file.

2

Place the code in a text file within the blen file, name it something.py and check the Register checkbox. This will register the script as module and load it on startup.