I'm trying to use a python script as an expression in a driver. It was working fine at first and then all of a sudden I get the error message ERROR: Invalid Python expression.
I've tried running the script in the text editor multiple times with no errors, but I get an error in the driver section. Anyone know how to solve this?
Scrip in text
import bpy prevTime = 0 ### # Rotates the object with the rotSpeed value in radians/s ### def rotate(rotSpeed, curRot): scn = bpy.context.scene curFrame = scn.frame_current fps = scn.render.fps # Calculate total playtime time = curFrame / fps # Get delta time dt = time - prevTime # This will set the current rotation value of the object!! newRot = curRot + rotSpeed * dt # Set new previous time prevTime = time return newRot # Add to driver namaespece to make it accessable bpy.app.driver_namespace['RotWithSpeed'] = rotate
EDIT: The error occurs when I add the line "prevTime = time".