Questions tagged [drivers]

Questions related to drivers. Drivers are used to control one property with another. Drivers can also use Python expressions to give even more possibilities, e.g. *#frame/2* will give the current frame divided by two. This tag is not to be used for questions relating to hardware drivers.

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6 views

Does mesa driver works with EEVEE on Linux?

I know that Cycles uses GPU for rendering and you need to have amdgpu-pro proprietary drivers installed and I can see my GPU (RX580) in options for OpenCL settings. However, AMD driver has some nasty ...
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1answer
56 views

How to rotate multiple (controller) bones with one main (controller) bone?

I got a quick question regarding rigging in Blender! So i recently picked up Blender to teach myself some of the basics things (modelling/rigging/etc), i have worked in Maya for many years prior. But ...
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12 views

Limit driver to certain location range

I am experimenting with rigging, and one of the components requires a corrective shapekey that is based on the location of a bone. The driver needs to only activate between a certain range (let's say -...
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1answer
122 views

Custom float property used in a driver need manual UI modification to work

I'm currently creating some script to automate a cloth rig setup. In the process I'm adding a custom float property to an empty and use it in a driver. It's a concept I wish to reuse for other ...
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2answers
19 views

No animation in Curves on using Bake sound to fcurves

In Blender2.9 , on adding location drivers to the origin of a Curve, there is no animation eventhough the location values are generated by baking sound to fcurves. ...
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1answer
249 views

Control MixShader value by shape key value

I have a Mix Shader mixing two textures and one shape key applied to an object. I want to control the mix shader value from the shape key slider. I think this is achievable by using drivers but i ...
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1answer
122 views

Boid Particles - How To Use Fighting/Battle Information In Animation (Fighting Ants)

I am experimenting with boid particles and I have set up an ant fight simulation, where there are two enemy boid systems emitted from different areas (vertex groups) of a plane. "Allow Land" is ...
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1answer
29 views

Use MeasureIt value in driver

Do values from the MeasureIt add-on have a data path we can point to when using drivers ? I've scrolled through the code but couldn't figure it out.
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1answer
508 views

Use self and the slow python expression

In putting together an answer to Changing Multiple Influences Simultaneously I came across the Slow python script warning in the drivers editor Using a set up as outlined here driving a pose bone's ...
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2answers
169 views

2D Animated Face, Is posible to drive the x-uv offset on Blender

So I wanted for a lot of time to do a model with an animated texture by face for a game and I stumbled with this video: 2D Eyes Maya to UE4 On it, they achieved the thing I'm searching for in Maya, ...
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2answers
79 views

Driving an Object at Half the Speed of the main Object

Hi I'm animating my Engines Rotating assemblies and I want to Drive the Cams at Half the Speed of the Crank (Example: Crank is going at 1 and the Cams are at 0.5) what is the operation to make this ...
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11k views

What does 'Autorun disabled' statement mean?

Could someone explain me what does this statement mean and what option should I click when it pops up?
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1answer
51 views

Blender 2.9 scripting, how to get the name of the driven property

I'm trying to get the name of the property that's been affected by a driver for a certain object, what I did so far: ...
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27 views

What is the Expression Script to add both Location and Rotation in Drivers?

Hi guys I'm asking for a simple question. I have a facial rig with several components. I made a shapekey for corrective so the bone can drive both of the components. For the eyebrows, I added ...
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1answer
30 views

Contrasted triangles on interface and transparent materials in viewport and material view

System Information Operating system: Linux-5.8.0-25-generic-x86_64-with-debian-bullseye-sid 64 Bits Graphics card: AMD TURKS (DRM 2.50.0 / 5.8.0-25-generic, LLVM 11.0.0) X.Org 3.3 (Core Profile) Mesa ...
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22 views

Access to constraint modified value

I modelled a window and add an armature to it. There is a bone called Window that's used to open the window and a bone called ...
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1answer
322 views

What are the advantages of separating FK and deform bones in an IK/FK rig?

In an IK/FK rig is there any advantage to having a set of deform bones (DEF bones) that are separate from the FK bones? This is opposed to a setup where you have one set of bones you make FK ...
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1answer
65 views

How to use different types of data blocks for driver variables?

I know that the content of text can be registered through a user-defined function and entered in the Expressions box. But how can I use text as a data block for variables, as shown in the image? ...
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1answer
515 views

Linked Objects, Drivers and Animation of custom Properties

I have created an Object with some Shape Keys. To simplify the planned Animation, I have created four custom Properties on that object and connected some drivers, so that the change of one Property ...
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1answer
303 views

Driver bone not working

For some odd reason I can't get my driver bone to work. I've followed tutorials, but whenever I move the bone on the Z axis (local) to control whether my eye opens or closes, it doesn't do anything. :-...
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1answer
23 views

True False Drivers

I'd like to enable/disable a constraint based on 'influence' being 0 or 1. Here is a picture of my situation. I think I'm very close, I'm just not sure how to tell Blender the command. Thank you!
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1answer
384 views

How to add driver to an input of a node in the Animation Nodes?

Whenever i add a driver to an input of a node in animation nodes nothing appears in the Driver editor.
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2answers
27 views

map 2d coordinates to 1d index using blender drivers

is there a clean way to convert a 2d vector ( from relative position between two objects ) to 1d index using blender drivers? it should be extendable to add more items later . it is useful to control ...
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1answer
54 views

Pause in relationships and constraints

I want to talk about relationships between (for example) two bones. There are two bones (A and B), bone B has a Cconstraint, bone A is the target of that Constraint. Let the Constraint be "Child Of". ...
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1answer
14 views

How do I set up a driver that will be effected by an object location and also changes based on that location

So I want to a driver that will animate a shape key as another object moves along the y axis. But at a certain point, lets say past 6 units, I want the shape key to decrease instead. How could I do ...
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0answers
42 views

“Can't edit this property from an override data-block” while adding driver

I tried to add a driver to a custom property after library override. And I checked the message, "Can't edit this property from an override data-block." On the other hand, proxy allowed ...
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1answer
47 views

how to control the same value on multiple different materials with an object's z location?

You can do this with drivers, and I've seen multiple blender channels that use an empty to control the value of multiple lights. i was wondering how i would use drivers to control the value of ...
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1answer
80 views

How to Avoid/Correct Circular Dependencies on IK Rigs with Drivers?

In reference to this report on mis-behaving IK rigs-- https://developer.blender.org/T76158 The answer is, IK rigs with dependency cycles have undefined (glitchy) behavior. My follow up questions are: ...
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3answers
2k views

nVidia driver causes flickering viewport background

I noticed a flickering background whenever I click a button or orbit in blender 2.8 or 2.79 It only happens when I use my NVIDIA 940mx but not when I switch to the integrated Intel 620. I can't ...
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2answers
34 views

How to get the data path of object dimensions for using in drivers?

Is there a way to get the data path of object dimensions for using in drivers? How to get the variable for a specific object y-dimensions for example? Thank you Chris
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0answers
17 views

How can I use animate/toggle render visibility on objects using one property?

I have a group of objects all sitting in the same 3D space. I want to be able to assign each object a number and by inputting that number into a field have only that object visible on that frame. Then ...
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1answer
28 views

How to lock an object so is always showing the same face when rotates

I'm trying to animate a bicycle and I have a question related to the pedals. Using drivers on the gear and the wheels I have got the automatic rotation of the bicycle as it moves through the y-axis. ...
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27 views

Using a 360 rotation to drive another object so that it rotates 0-180 and then again 0-180 [duplicate]

I've got a bit of a remapping problem with my driver setup. Driver disk rotates 360 degrees (or more) Driven disk should match the driver for 0-180 degrees. Driven disk should then rotate again from 0-...
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1answer
32 views

Accelerate and Decelerate linear Rotation

So I'm animating a 10 minute long clockwork sort of animation that has spinning gears all driven the rotation of a single object. There is a default speed and a faster speed I want them to rotate at. ...
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1answer
32 views

Script working on an object but not on another

I downloaded a blend file from another user here with a script (for drivers) and a mesh + armature. On the driver of said mesh it says Error:invalid Python expression. I couldn't get it to work for so ...
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1answer
15 views

is it possible that python .add_driver command cant create f-curve?

If I created a constraint on some bone, in pose mode - let's say Copy Location. And then manually created a driver on the influence (right mouse button > Add Driver), the f-curve with 2 points was ...
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27 views

How would I create a rotation speed controller

So I was trying to Create a Animated set of gears that play continuously through out a project. I have managed to do so using drivers a number of ways. (setting the frames or position of a moving ...
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0answers
19 views

Copy drivers from shapekeys

Basically i have one mesh (my character) and armature for that mesh full setup. A whole control rig and bunch of corrective shapekeys on my mesh which are driven by bones rotation (its daz3d mesh/...
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1answer
72 views

How Use the rotation of a driver object to drive the 0-1 position of 12 driven objects

I've specfied my question so its hopefully a bit clearer. The idea is to use the rotation of a driver, to drive 12 driven objects. This means that for every 30 degrees of rotation, a driven object ...
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3answers
111 views

Blender make driver use local bone axis

I want to have a bone that drives another object's y location according to its(the bone's) local y axis. this is the driver I'm using. In this case the driver is working(The driver is what is making ...
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0answers
23 views

Are the drivers slowing down the animation playback?

I recently removed the drivers of a rig to discuss a problem on this same website, and I was surprised to see my playback going from 2.5 fps to 12/13 fps. Are the drivers possibly responsible for ...
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1answer
230 views

How do I get the position of an object from a previous frame? Not the current frame

empty's are ignored when rendering in eevee (but not in sound engine) I made a some drivers with empties to determine the speed and acceleration of the object, but when rendering, the behavior of the ...
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1answer
49 views

How to attach an animation to an empty

i have some keyframes on my object , and i want to control that from an empty , so that when i move the empty forward i plays the forward animation. How can i do that. I know that i must use drivers , ...
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13 views

Offset animation for many objects using drivers

i have thousands of objects moving a path with the follow path constraint. i want every one of them to have the same animation but offset a couple frames. it seems to be impossible to get a value for ...
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22 views

Updated my drivers on my RX5700XT and now blender 1.83 crashes every time I render with cycles

So some of my games I was playing were messing up and it started to get annoying. So I updated my drivers on my GPU to 20.8.3 but now that I have those, blender refuses to render in cycles, it just ...
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0answers
23 views

180 degree bone rotation stutter problem - chained Action & Driver rotation

There are a number of posts referencing 180 degree stutter/flipping issues and resolving them by using a driver in-place of a modifier/constraint - which seems to work OK for a 1-to-1 relationship. ...
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109 views

Cycles rendering mode crashes the entire program AMD OpenCL

I never had this problem before, I recently came back to Blender and I'm doing the Donut series by Andrew Price, everything was working fine and I got midway but from one day to another, the entire ...
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1answer
34 views

Driving emissives with mesh objests

Is there a way to achieve something similar with Blender? Specifically, I want to drive the lights with a 3d mesh. https://youtu.be/zRJ_HWQ7peE
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0answers
16 views

Blender did not run and shows some error [duplicate]

When I tried to run the blender it shows this I don't know how to solve this as I am new to coding. Anybody help me with that??
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1answer
74 views

Is my performance affected by invisible items?

I am making a video and I am planning to have a particle emitter to shoot lasers from my spaceship. My theory is to somehow keep it going endlessly, but control its invisibility somehow, perhaps with ...

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