Blender Driver Expressions

Is it just by writing in the script - bpy.app.driver_namespace['Function_name'] = Function_nameYes it is, but the name space must exist before you attempt to link a scripted expression to it or the scripted expression will error out. So the typical work flow is to make the script a Registered script so it loads and is run automatically upon load, establishing the name space, every time the BLEND file is opened. The requirements for a script to be registered is to name the text document that the script resides within with a.py extension. Example: myNameSpace.py When a text document has the.py extension the Registered checkbox becomes available. Activate it, save the BLEND file and re-open it and your script will run automatically thus establishing the name space for the driver. Thanks Atom, I never really dived into py-drivers, but your example made it super easy to understand.

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I'll also take advantage of this post for another question since it's related to drivers. Does anyone knows if it's possible to have 2-way drivers, so that they control each other in both directions? For example x axis of bone.left controls the -x axis bone.right and vice versa, so they always co-respond to each other. Twas curious about this so I tried it and I got to say - no you can't. You can control the -x axis of bone.right with x axis of bone.left, but once you try to control bone.left with bone.right it goes haywire. It acts very much like a cyclic dependency and I know that if you try this with constraints, that's what you'd get. Of course, I only tried simply driving one bone from the other and vice versa.

You might be able to do it with py-drivers & if/else statements. Great, Thanx Atom today i wrote my first python driver:) really usefull just to mention in case someone else that is a python newbe like me is going to use it as well: - import bpy is required in the beginning - don't forget to hit update dependencies before reloading the file Twas curious about this so I tried it and I got to say - no you can't. You can control the -x axis of bone.right with x axis of bone.left, but once you try to control bone.left with bone.right it goes haywire. I think it's something that could be sometimes useful, almost sure it's possible in 3dsmax with wiring. The only way i could think is somehow to make a third property value.

So that when you move the X of on of the objects it will actually change the third property value which will change the actual X values of the objects. Acer Fuquene Motherboard Drivers. But no idea if it makes sense and would be possible to implement.

Maybe i can offer this 2 way drivers for the Google summer of code? I think any arrangement of influences that creates a mutual dependency loop (A depends on B which depends on A, even if it's through an lengthy chain of relationships) will flake out in Blender, it's a classic cyclic redundancy issue. A better approach I think is to use a separate controlling object to influence both bones in parallel.

Thus the bones are not controlled directly, and so don't have to influence each other, though the overall effect is the same. This is how I have constructed simultaneous-influence rig systems using constraints, so I assume that a similar situation would be workable for scripted drivers.

I been trying to build the 2-way driver and I got to a somewhat interesting result, the only thing is that I have to hit 'run script' every time I select the other object, in other words, I guess the script should be running in real-time and it's not. Can anyone have a look at the attached.blend file and tell me what I am missing? You will find a cube and a sphere with currently the cube being selected. If you drag the cube the sphere will follow, then if you select the sphere and hit 'run script' you will be able to drag the sphere and the cube will follow and vice-versa.