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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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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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How do you assign objects to seperate custom properties values?

I would like 5 objects to be placed on the same property but be hidden or shown when the value is changed to a number like 3 or 5 but increasing the values don't seem to work. I have a feeling I need ...
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18 views

Shader Based Cross-Sectional Cut - Dynamically Controlled with Object

I have worked out how to map a colorramp across an object using shader nodes, and I can also set some of the color stops as transparent so that the object can have a sectional cut exposing the ...
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19 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 just happens when i use my nvidia 940mx - when i switch to the integrated intel 620 - its gone. i can ...
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1answer
21 views

How do you use drivers to hide an object or mesh?

instead of going into the outliner I would like to use the properties tab to change meshes. I've tried to look for some tutorials but most of them are on shape keys. For example; skin 1 is hidden and ...
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20 views

How to drive the color in node editor by the color of the light?

I want to control the color in the node editor by light color. After trying it myself, I guess I should probably get the RNA properties and enter it in the driver editor in the correct way. I ...
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20 views

canvas rotation wheel blender 2.8

I need a canvas rotation wheel, a driver, like the one below however without the mirror feature I have no experience in python, i try and stick to animation, if someone could help that would be ...
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16 views

Better to add extra bones before or after generate rig

Im using rigify addon and plan to add some shape keys and some drivers later on like for facial expressions and talking. Is it a good idea to add those driver bones to the metarig before I click ...
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52 views

The second emitter does not emit particles in the correct way

I'm trying to create a traffic simulation using the blender particle systems with different model of cars. The enviroment consists of a two-lane road. I want the cars crossing the two lanes in ...
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7 views

Looking for advice on realizing Blender scanner type project, maybe using sensors in Game Engine?

I have a project I want to start and I am looking for advice on the best direction to go using Blender. I am pretty new at Blender. Basically I want to create a 3D scanner type thing within Blender. ...
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16 views

Assign more than 2 shape keys to same object bone

Initially I had 2 shape keys for my eyebrows which I used as a driver using a bone z location (-3*var and 3*var). This worked fine. But now I wanted to create a third shape key. So after that I added ...
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1answer
77 views

drivers and custom properties for buttons

I'm just beginning to get into drivers and custom properties for bones and I was wondering if its possible to set up drivers or custom properties for buttons rather than sliders. The reason is I have ...
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2answers
55 views

Looping background (png image) in Blender for a car chase scene

While animating a car chase scene I need to have a background image (that includes trees, buildings etc) which moves from right to left and gets repeated in loops. I Couldn't find any driver or ...
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Blender Crashes on start up [duplicate]

I keep getting this on start up can anyone tell me what do this means AL lib: (EE) UpdateDeviceParams: Failed to set 44100hz, got 48000hz instead
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2answers
31 views

How to make a Text File dependent of an Armature object so that it appends with it to other projects?

If you ever used BlenRig, you may have noticed that it pops up a text file in your text editor called "generate_customprops.py". This is a python script that the rig uses for various purposes such as ...
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Spline IK gets disabled on random frames (new depsgraph) / bone drivers get updated too late

I’m trying to get my Spline IK working. It’s behaving the way I want to, except for random frames where it looks like the Spline IK doesn’t get applied to the bone chain and the bones go back to their ...
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1answer
103 views

CUDA, 3D Hardware & Nvidia driver, my Blender goes crazy

First I want to say that yesterday everything worked fine for me. Let's start. When I launched the blender this morning, I saw this: I very quickly found a solution to this problem (Blender Can&#...
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58 views

Which driver should I use for Blender on Linux with an AMD GPU?

Which drivers should I install for best OpenCL performance on Linux? I recently tried installing the proprietary AMDGPU-PRO and they failed to install "Error kernel something". After that I tried to ...
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2answers
249 views

How can I rig a cylinder so that when it's rotated its end cap will not penetrate the floor?

I have a default Blender cylinder positioned upright atop a ground plane: How can I rig the cylinder so that can be animated to wiggle/jitter (perhaps procedurally with noise f-curve modifiers on two ...
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0answers
42 views

Can I “mute” all f-curve drivers in a single click?

I often need to review the results of my face-rig's expression animation transitions. However while drivers are connected to the bones the animation data does not change the bone's transform when the ...
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1answer
20 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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24 views

What is the “standard 3-rig setup”?

The comment on this ticket states that lagging from cyclic constraints can be solved be using the 'the standard "3-rig" setup'. What is the specific setup this is referring to? Is it still considered ...
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0answers
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Using drivers to animate the opacity of a strip in VSE

my final goal would be to use Blender VSE for video editing, where I'd overlay a strip over a background video when there is sound in the corresponding audio track, so basically, the volume in an ...
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1answer
70 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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34 views

Why is this driver expression not working?

as you can see here the strength of the light's property shoulds always be => 0 but the expression isn't working.
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1answer
53 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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1answer
48 views

Blender crashes with GPU installed

On a recently assembled computer, attempting to run the BMW Benchmark using CPU render causes the screen to flickers after a few minutes and blender crashes, while using GPU render works fine. After ...
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43 views

Using a curve's calc_length() method in a driver expression?

Recently I've dipped my toes into Blender's drivers & expression system. I'm trying to scale a road to exactly fit the length of the curve it's following. I came across this post of two years ...
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15 views

Is it possible to create a driver that is controlled by a marker?

Imagine I'm using SHOT_01 marker for camera 01 and SHOT_02 marker for camera 02 view, and I want to have Object A visible only during SHOT_01 and Object_B visible only SHOT_02 Is there a way to do ...
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12 views

How to set the F-curve that defines the bone’s Y position to a reasonable range

I'm trying to drive the control bones of the armature through the shapekeys using the method explained here,that's basically something like this : Add a driver to the bone’s rotation in Pose Mode (...
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0answers
20 views

rotating a rotor-wing by driver

I got a rotorwings (drone) that i would like to drive by a driver (distance to base-empty). the drone itself can rotate over any axis, but i like its rotors to be driven by the distance to base-empty....
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14 views

Proxy targets get messed up with custom properties

I'm not sure if this is a bug or that I am doing something wrong. Let me sketch the situation. In a library file I have an object with a custom property driving shape keys. When I link the cube in my ...
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1answer
43 views

How to have skeleton/armature change with shape keys?

I want to have it so when I change the value of a shapekey, it also moves a bone according to the value. So for example, when I change my character meshes eye width or height, the eye bones move with ...
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Is there an equivalent of After Effect's “valueAtTime()” for drivers?

In After Effects you are allowed to use Expressions very similar to blender's drivers. In a very simple fashion you can get a property's value based on a given time like so: ...
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Driver not updating when rendering animation

Have you ever experienced such an issue? Driver not updating when rendering animation, but updating when single images are being rendered one by one? Case description: I created empty, linked to a ...
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1answer
56 views

Rigging a Wheel to Turn Corners: Drivers vs. Bones

The tutorials I've found show how to rig a wheel to roll automatically, in one direction (X or Y), in relation to the location of an empty or bone. I've managed to get the wheel rotation to work along ...
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0answers
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How do I make a driven bone cause its keyframe value to change?

So I developed a method to export a face key animations via BVH. Below is a character that has a row of bones over its head. They contain facial animation data, one bone per shape key. So all I ...
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4answers
267 views

Drive shape key based on relative camera orientation?

Let's say (for the sake of simplicity) that this cube with two blue sides is my character... and the shape key in question raises a few vertices on top. Whenever the camera views either Blue side, I'...
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1answer
157 views

How to drive shape keys based on the angle between two bones?

My character rig needs shape key correctives when it makes certain poses (eg. lifting the arms, the shoulders need to be corrected with a shape key so they don't lose volume). I know you use a driver ...
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How do I make a driver bone that adds value to a driver then resets to its original position?

A bone in its starting position, if you grab it and move it up it adds value to a driver, if you move down it subtracts value to a driver but once you stop dragging it and drop it, the bone ...
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1answer
34 views

Weird driver behavior on frame change

I came across some weird driver behavior and hope someone can explain this to me. I was trying to create a wheel that rotates automatically on the floor when it is moved along. (Just like real world ...
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1answer
30 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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21 views

How can I insert “blend_filename” into the output node?

One thing I often do is rendering via CLI, and I like to choose EXR format to have 32bit files ready for archive. I also like to have blender saving the jpg preview to quickly see it in OS filebrowser....
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Question Using Drivers, Control the driver at specific frame to either turn off or minimize effect

I am using a driver in blender that controls a ShapeKey (ponytail moves up) I am assigning that driver to act on the spine bone in the head. so if the head looks up, the ponytail wont clip into the ...
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1answer
25 views

Select or find everything that a driver is driving?

How can I find out all properties that a driver is driving without manually checking every object in the graph editor?
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12 views

Scaling problems (using drivers or hooks)

I want to do a wooden construction within Blender 2.79. The width of the beams shall be variable (for example using a driver) but identical for all beams. My problem is that the position of the beams ...
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288 views

Why is Blender 2.78c/2.79/2.79b CUDA Rendering option not available with Nvidia GTX780Ti on Windows 8.1 OS?

Does anyone know why Blender will not show CUDA option for rendering in Blender if I use Nvidia driver later than Driver Version 388.71 released on December 20th 2017? The CUDA Compute Rating is: ...
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23 views

Entire blender is greyed out/highlighted.. or something

I haven't been in blender for over a month now and when I started it up fo the first time in a while, the whole thing is like white/grey: I get the feeling that it might be because my computer needs ...
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1answer
136 views

Problem with Material drivers for nodes properties

I'm following these instructions https://blender.stackexchange.com/a/75652 (paragraph "Setting drivers"), and also the video linked here https://blender.stackexchange.com/a/5384 video: https://vimeo....
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1answer
146 views

Rotation Value ist not the same as given in the driver output

I am just trying to set up a dynamic circular array of objects. To keep it as dynamic as possible, I want to make my helpers empty z rotation driven by a driver. The Scripted Expression looks like ...