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# This script defines functions to be used directly in driver expressions to
# extend the built-in set of python functions.
#
# This can be executed on manually or set to 'Register' to
# initialize the functions on file load.
# two sample functions
def invert(f):
""" Simple function call:
invert(val)
"""
return 1.0 - f
uuid_store = {}
def slow_value(value, fac, uuid):
""" Delay the value by a factor, use a unique string to allow
use in multiple drivers without conflict:
slow_value(val, 0.5, "my_value")
"""
value_prev = uuid_store.get(uuid, value)
uuid_store[uuid] = value_new = (value_prev * fac) + (value * (1.0 - fac))
return value_new
import bpy
# Add functions defined in this script into the drivers namespace.
bpy.app.driver_namespace["invert"] = invert
bpy.app.driver_namespace["slow_value"] = slow_value
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