I would like a script example please

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1

I need a run once simple script that creates a driver.
I want a simple 1 bone in a rig to drive 1 shape key.

I know how to modify a script but I have not found an existing script that I can edit to suit my own project.

2

You don’t need any scripts to create a driver.
Take a look on this video:

3

I know I don’t NEED a script but I want a script to alleviate creating hundreds of drivers. Where just one character has around 30 of them.

4

well, previously you’ve said

anyway, here is the code:

import bpy

def newDriverByBoneLocation(object, shapeKeyName, armature, boneName, transformType, modifier):
    sk = object.data.shape_keys
    driver = sk.driver_add('key_blocks["'+shapeKeyName+'"].value',-1).driver
    driver.type = 'SCRIPTED'
    var = driver.variables.new()
    var.type ='TRANSFORMS'
    var.targets[0].id = armature
    var.targets[0].bone_target = boneName
    var.targets[0].transform_type = transformType
    var.targets[0].transform_space = 'LOCAL_SPACE'
    driver.expression = var.name + modifier
    
newDriverByBoneLocation(
    object = bpy.data.objects['Cube'],
    shapeKeyName = 'Key 1',
    armature = bpy.data.objects['Armature'],
    boneName = 'Bone',
    transformType = 'LOC_X',
    modifier = ' * 0.5'
    )

and here is a blend file to test it:
create driver example.blend (741.6 KB)

I hope this solves your problem

1 Like
5

This is truly delightful. This is a simple script but will save me a ton of time than manually editing every single driver. But not just that but as you can see playing around with the script I’m learning a bit of scripting also. As the best way I learn is by example.

Thank you so much!

# Big thanks to Jerzy Górski for writing this handy script. 

import bpy

def newDriver(object, shapeKeyName, armature, boneName, transformType, modifier):
    sk = object.data.shape_keys
    driver = sk.driver_add('key_blocks["'+shapeKeyName+'"].value',-1).driver
    driver.type = 'SCRIPTED'
    var = driver.variables.new()
    var.type ='TRANSFORMS'
    var.targets[0].id = armature
    var.targets[0].bone_target = boneName
    var.targets[0].transform_type = transformType
    var.targets[0].transform_space = 'LOCAL_SPACE'
    driver.expression = modifier
    
newDriver(
    object = bpy.data.objects['Body'],
    shapeKeyName = 'Eye Blink L',
    armature = bpy.data.objects['Renka'],
    boneName = 'Blink.L',
    transformType = 'LOC_Y',
    modifier = '(var *-20) if var <0 else 0'
    )
    
newDriver(
    object = bpy.data.objects['Body'],
    shapeKeyName = 'Eye Blink R',
    armature = bpy.data.objects['Renka'],
    boneName = 'Blink.R',
    transformType = 'LOC_Y',
    modifier = '(var *-20) if var <0 else 0'
    )
1 Like