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.

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43 views

How to set up shape key driver in 2.80?

So I have this character animation with a shape key that flattens and unflattens his hat: (in glorious technicolor here) It looks good. But the shape key is mucking up all my other Actions now. It ...
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10 views

How to export shape keys as fbx when they are controlled by drivers?

Good afternoon, I have an animation set up in Blender where I have bones controlling the shape keys of my object. The shape keys have drivers, so when my bones move, the shape keys activate. However, ...
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How do you convert an expression that works in the console into a format a driver can make use of?

I'm trying to convert the following expression for use in a driver expression: 1 if ( bpy.context.scene.frame_current == bpy.context.scene.frame_end ) else 0 So ...
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22 views

Access material node drivers from python

I would like to store my whole node input driver set up of a material in a txt file and load it back any time. How can I access the driver data along with node name and input number?
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2answers
364 views

How to update the dependencies of a driver via python script?

i need to be able to update the dependencies of my drivers via script, does anyone knows how to? thank you very much in advance! my script works on changing the values of the drivers , but sometimes i ...
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1answer
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How to connect shape key animation as driver to rotate a bone in pose mode

I am attempting to utilize facecap (iphone app) face fbx file (it has 51 shape keys with animation data on it etc) on a character with rigify rig (face as well). Question. i want jaw rotation (jaw ...
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1answer
18 views

How to add drivers in node inputs in python?

I am trying to add a driver in a node entry in the World. The following script fail with "TypeError: bpy_struct.driver_add(): property "inputs" not animatable " I can't find sample of similar code. ...
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1answer
107 views

Maintain equal rotation on multiple objects

I am making a model with gears. I want to be able to turn any gear and have the others follow. Using constraints or drives only one gear will rotate (and the other will follow). Is there anything I ...
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1answer
25 views

Driver scripted expression problem

Hello fellow blenderers. In my recent work I try to create procedural football stadium using array modifiers. For that to work fluently I need to set up drivers and this is the point where problems ...
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Set Keyframes for Drivers

I'm trying to animate some Gears with Drivers. With the Expression '(bpy.context.scene.frame_current)/10' it works very well. The gears are rotating from begin to end of the frame range, but I would ...
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Bone locations that control shape keys with drivers

I have a rather complex rig with 292 bones total. I am at a point now where I would like to work on shape keys to add detail to mesh deformations such as muscle contractions etc… The question I have ...
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How can to link the colour of a point light to the RGB colour of another object in the same scene?

In my scene I would like to link the colour of the point light to be the same as the colour of another object, which is determined by the shader applied to that object. The output of that shader is ...
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1answer
56 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
35 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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sending Data or Values to linked Objects in Blender 2.80 / 2.81

I work a lot with linked data and library objects or linked collections. Is it possible to send values or variables between the different hierachical structures ? So for example: SCENEFILE (var = ...
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1answer
46 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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2answers
51 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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Blender 2.8, Getting Script to Update a Driver

I have a for loop (A) that is updating a Custom Property (B) that is a driver for a Cube's X-location (C) which is supposed to update the Cube's location (D) and Export each incremental change to a ....
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Transform Animation from drivers to shape keys

I have a character head with shape keys for facial animation. I setup drivers to control the animation using circles. I need to make blender record that animation into the shape keys so I can Export ...
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1answer
42 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
33 views

Delayed copy rotation…?

I'm trying to make a constraint or some kind of system in 2.80, where i have a vehicle, driving on a path (follow path constraint, also rotating, but only on z axis) and a third person camera, ...
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1answer
418 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
55 views

Blender 2.8 keeps crashing after updating gpu drivers

I have a gtx 1660 ti everything worked fine, but when i updated the nvidia studio drivers to the 9/04/2019 release, and tried to check if the render times got better, but to my disappointment blender ...
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1answer
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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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Keyframe to Copy One Property Value into Another

Is there a way to add a keyframe that will copy the x location from one object to a property on another object. It needs to be instantaneous, not continuous (like a copy location constraint). I want ...
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1answer
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Can't try Blender 2.8 due graphic card and/or driver

this post may seem repetitive but among many with this kind of issue none of them can help me. I already updated both drivers (Intel and Radeon) and BIOS, installed Radeon ProRender + libraries and ...
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1answer
176 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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2answers
10k views

Blender 2.8 Beta: OpenGL 3.3 Error?

Before I start, YES, I have done my own research - I know how annoying a repeat question is. Yet each answer is so specific to others... When I tried the beta 2.8 64 bit, it says "Blender requires a ...
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3answers
267 views

Python: How to connect shapekeys via drivers?

I managed to make a script connecting the shapekeys of different objects via drivers. But I don't know how to overwrite an already existing driver. If anybody could give me a hint? ...
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0answers
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How to rig a BB-8 Model?

I want to make a rig for this BB-8 unit so that when it moves on X or Y axis it can rotate automatically even if it moves on both axis (on diagonal direction) most of tutrorials i saw works in case it ...
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2answers
183 views

Blender eats space on C drive

Yesterday I've had 2GB of free space on C and only after using Blender it has all gone. Can anyone help me?
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Problems with driver setup

I will lay this question out as detailed as possible so hopefully I get the answer I am looking for. I have been reading a heap of related posts on this site and Wikipedia and other Blender related ...
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1answer
54 views

How to drive a value with linear fcurve on both positive and negative axis?

Like for example: I have a constraint on object A, B is driving the constraint influence. If I move B in +X axis 0 to 1, the influence on A is going 1 to 0 on a linear fcurve. I want to ...
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1answer
48 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
50 views

how to use a driver to drive object on object's local axis

I have a rig with face keys. i have a separate animation and i would like to use the animated data to drive the face keys. problem is when my object rig turns the axis changes relative to world axis....
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1answer
57 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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How to config Blender on Ubuntu 18 to use Amd-pro-gpu Driver instead of ROCM?

I run blender on ubuntu 18.04. After setting up the system and installing the AMD-pro-gpu driver for my VEGA FE from AMD' s official website, blender performed smoothly completing the BMW demo (gpu ...
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21 views

Relative rotation in drivers

I want to control an object C by a driver (based on a Python script) affecting the z-rotation depending on two other independent objects' (A & B) z-rotation. For example A rotates from 0 to 45°, ...
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11 views

How to get fist to clench in one bone

I want to get my armatures fist to clench to a certain point (1) and unclench (0) with one bone, similar to an IK but with less variety, I think it's called a driver. As in 1 is clenched fully and 0 ...
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Driver input as location in other object's transform space

I would like to have a driver input variable controlled as the location of some object in another object's transform space. Is there an easier way of doing this than having input variables for all of ...
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1answer
79 views

Data path for driver: secret of 'node_tree.'

1) I prepared two objects for driving. 2) I copied the data path of the color property of diffuse shader in Suzanne's material node to drive the box. ...
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Blender 2.8 Add Driver refresh problem

I created a script (new object panel) I connected to custom property via Add_DRIVER manually. A custom property value incremented in all frames (via frame_change_post event) Another property connected ...
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20 views

How do I make drivers depend on time?

I want to animate an engine and want to make the piston move on the z axis like a sine wave, with the frequency depending on the position of a plane on the x axis, like this: sin("location of the ...
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1answer
198 views

Help with implementing Shape Key Drivers

I was wondering if anyone could help me out with figuring out how to use Shape Key Drivers for the model that I've been working on for quite a while. Basically, I need my model's head to be able to ...
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2answers
728 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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1answer
539 views

Blender game engine, shape key driver

i want to create a character with differents shape keys for modify things like if the character is big or small, if he smile or not... and i want to modify values or shapes on blender game engine. To ...
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0answers
7 views

F-curve and driver, why is the value of the curve is not on the graph?

I just move from 2.79C to 2.8. Trying to make switch for FKIK on the leg & feet. Using driver for it, but the value wont move on the cruve like it should. I cant seem to rotate the curve like I ...
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27 views

Is it possible to use a list of keyframes to control multiple shape keys to animate a mouth?

I'm a 2D animator transitioning to 3D and my process so far has been to do lip sync in character animator (they've made things very easy to adjust keyframes for mouth shapes) then move that ...
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6 views

Blender 2.80: Driver of a value of a softbody simulation not visible in editor

To an object there is a softbody simulation. I added a driver to the "tension" value of it - the background of the value field changed color as it should be. Then I "open in driver editor" and no ...