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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.

2
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0answers
35 views

How to make abs() give correct result for negative numbers?

I am trying to use the simple absolute function abs() in Expression frame for a driver, but it won't work. I've tried to put it in long sentences, or even just typing abs(-1) but the negative still ...
1
vote
1answer
35 views

Baking camera property drivers to keyframe

I know its possible to bake the values of drivers to keyframes using Object > Animation > Bake Action but is there a way to bake a driver that is controlling ...
3
votes
1answer
53 views

Empty controlled light grid

I'm still not an animator in any way but I have to find a way to animate something... In a way resembling to what is achieved in this video, I have to create a grid of light bulbs which intensity and ...
3
votes
2answers
105 views
+50

Change a Driver based on which Scene is being Rendered

I am looking to drive a property in a material node based on the current Scene when rendering. The purpose would be to mix between two different parts of the node tree so that one Scene renders one ...
0
votes
0answers
7 views

Visual keying on bone driving shape key issue

I'm rigging in blender a character with clothes that can be put off ( ex : the character undresses in one animation) To do this, bones that affect the pullover's mesh are constraint ( child of ) by ...
0
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0answers
11 views

Make Drivers Control Textures?

I'm working on a model right now with an image sequence. I only want the texture on my character to animate when a particular bone is being animated. When it's resting I want the texture to rest. I ...
0
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0answers
18 views

Drivers / Constraints resourses usage

I'm trying to optimize the rig of a cartoon creature, and this rig has really large amount of bones (more than 400) to have all the abilities according to the plot. I have IK/FK chains, Stretch To ...
0
votes
1answer
57 views

Material driver works, but doesn't update in viewport [duplicate]

I'm on Blender 2.79. When using drivers on node properties the material doesn't update on the Rendered/Material viewports until I force reload it. My drivers are pulling custom object properties from ...
0
votes
1answer
36 views

Copy drivers from one Armature to another of the same kind

I have a mesh/armature combo, which I developed in a good amount of steps. The first iteration has drivers for bones which drive other bones of the armature. While developing the neither the armature ...
2
votes
1answer
36 views

How to write drivers to be copied and pasted between objects' modifiers?

I have assigned a script-expression driver to a field in a modifier. The expression is a function of properties of the object to which the modifier is assigned, extracted as Single Property variables. ...
0
votes
1answer
13 views

Is there a way to restrict the operation of a driver or even record the action of the driver in Blender

I have a small animation playing and I have made use of some trajectory equations in order to obtain a more realistic jump in the form of a driver, but I also want to add some additional movements to ...
2
votes
1answer
25 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". ...
0
votes
1answer
24 views

I can't add drivers

So, I know how to add drivers, but for some reason it is not working at all. I go to my object and hover over rotation on the Z axis, then I press ctrl+d and choose Single from target and the problem ...
0
votes
1answer
30 views

How to transform (translate, rotate, scale) Vertex Groups using drivers?

I'm trying my hand at procedural modelling using Blender. Houdini is known for procedural modelling, however, I want to achieve the same with an open source software like Blender. I am currently ...
0
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0answers
14 views

Driver-based facial rigging streamlining?

I've been experimenting with the ManuelBastionLab of late. While I've been able to get some pretty good results, one thing I find rather awkward is the lackluster rigging that you get by default. ...
0
votes
0answers
32 views

Wacom Cintiq pen input stops working when I launch Blender

I have a basic understanding of blender but don't know the ins and outs at all so I'm definitely a noob. Right now I have a Mobile studio pro connected to a dell xps 15 via usb-c. Whenever I open up ...
0
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0answers
23 views

How to set up wheel rotation with drivers so that it works correctly with the car following a path?

I have set up the wheel rotation with an empty object and drivers. It worked until I made a car to follow a path (empty of a car body follows a path). Then the wheels start to rotate in right ...
0
votes
1answer
24 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. :-...
0
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0answers
20 views

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 ...
0
votes
1answer
94 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 ...
0
votes
1answer
28 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 ...
1
vote
0answers
29 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 ...
1
vote
0answers
40 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 ...
2
votes
0answers
59 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 ...
0
votes
0answers
9 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. ...
0
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0answers
22 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 ...
1
vote
1answer
123 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 ...
1
vote
2answers
67 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 ...
1
vote
2answers
45 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 ...
1
vote
0answers
25 views

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 ...
1
vote
1answer
216 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&#...
0
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0answers
183 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 ...
10
votes
2answers
268 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 ...
2
votes
0answers
55 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 ...
0
votes
1answer
56 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 ...
2
votes
1answer
44 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 ...
1
vote
0answers
27 views

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 ...
1
vote
1answer
108 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 ...
0
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0answers
42 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.
2
votes
1answer
82 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 ...
0
votes
2answers
129 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 ...
1
vote
0answers
50 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 ...
0
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0answers
17 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 ...
0
votes
0answers
20 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 (...
0
votes
0answers
25 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....
0
votes
0answers
18 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 ...
0
votes
1answer
60 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 ...
2
votes
0answers
25 views

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: ...
1
vote
0answers
40 views

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 ...
0
votes
1answer
99 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 ...