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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13 views

Modify driver from within another driver?

It's possible to modify most of an object's properties arbitrarily in a driver. For example, the below driver, when placed on an object's X location transform, will copy that object's Y location to ...
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9 views

Blender 2.9 Light Power Driver Formular always returns 0

I try to add a driver formular for lights which should result in heart beat like pulsing. In general when I only use #frame*800 it works. But when I use a "complex" formular it is always ...
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1answer
32 views

How to drive object's local transform by another object, while relative to third object?

That title is probably a bit confusing so lemme try to explain what I mean: Let's say I have two objects: Object A and Object B, and two cameras: Camera A and Camera B. I want the position and ...
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1answer
16 views

Shape key driver posing affects the resting pose?

So I'm working on a rig with eyelids that close via shape keys run by a driver. But when I go into pose mode to play with it and then switch back to rest mode or go into edit mode which would usually ...
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23 views

How to disable part of an animation

I have a complex animation with lots of thing like position, colors, etc animated using keys and drivers. I'd like to disable some of the aspects without removing anything. For example, here the ...
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24 views

How to get a value between 2 and -2 with a driver having 2 variables having z rotation of camera and the z rotation of object in view?

I am trying to animate a character which require driver value of range -2 to 2 when the character rotates his head and also when camera rotates around the character. I am having trouble with the ...
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1answer
27 views

How to maintain driver positive values

I have an empty object driving a cylinder (X) Rotation by empty (Y) Location. Is there any way to maintain Cylinder (X) Rotation on positive values even if I move the empty (Y) Location to negative ...
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1answer
48 views

Invalid drivers aren't shown and can't be deleted

I have following problem. With the minecraft rig works everything fine (thomas rig) but when I open the console there are displayed invalid drivers of already deleted objects. How can I delete them? ...
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1answer
45 views

Driver using self does not update location in render only

I am writing a driver in blender 2.91.2 to simulate a spacecraft's Reaction Control System thrusters based on the movement of a parent object, without having to manually adjust and keyframe each "...
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2answers
42 views

Limit Rotation to keep tip of rotating bone within a circle when rotating diagonally?

I'm rigging some eyes, and I want to limit the rotation so that the iris stays within a realistic movement range. This is easy to do for horizontal and vertical movement, but runs into a problem when ...
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1answer
21 views

Driver: How to I create a driver for door lock that is opens and closes base on the door handle angle(+/- degrees)?

I have been trying to create a driver for the doorTypeOneBarBig that will lock it and unlock it base on the rotation of the doorTypeOneHandle. The doorTypeOneBarBig should be in the lock position(push ...
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18 views

Dynamic drivers

Is there a way for a driver that is set up to reference a material so that it can be used be used across different materials cloned from the initial driver? So that if I have Material001, which ...
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14 views

Is it possible to use custom properties as driver to control an action?

Looks like with Action Constrain, only transform attributes can drive actions. Is it possible to use custom properties to do this?
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19 views

What is the proper way to access the active scene in a driver expression? [duplicate]

I tried to access the FPS setting of the render settings in a shader node through a driver expression. The attempt was successful, but I got a warning and a tip saying: WARNING: Driver expression may ...
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10 views

Exposing the Lifetime of a Particle to use it for animating other properties

I want a particle system, using an object (mesh) particle, which is animated via a morph. (Shape key). The shapekey`s percentage of the particle should be driven by the particle age. (lifetime) Sounds ...
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1answer
36 views

How to create such a mechanism? [closed]

I thought to do it sideways. Here you need to use drivers and math, I think. But where can I find similar examples in execution, tutorials with a solution to a similar problem? Or books, videos, ...
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1answer
43 views

How to share node value with another node to keep them sync

How should I setup a driver to keep two values same across blend file? Like ... World > Mapping node > Z Rotation value to Object > Mapping node > Z Rotation It would be handy in case ...
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1answer
26 views

is there a clever way to enlarge the driver expression field?

my formulas are sometimes a bit longer and i wonder how you guys enter or edit values there? are you all tapping ctrl-space to maximize the window and then enlarge the panel with mouse? Or is there ...
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3answers
470 views

How can I use a driver for multiple objects?

I made this little easy animation where a barrier opens automatically, if the car is near enough. I realized it with a distance driver. Link: https://youtu.be/s78ClbPBHNM Now I would like to add ...
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1answer
36 views

Question about a driver rotation expression [duplicate]

so I have a character with a skirt that's rigged. The skirt is positioned much higher up than the leg so once her leg/thigh reaches a certain height, I want her skirt bone that I have set up to also ...
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1answer
21 views

Why aren't my driver values updating?

I am currently in the process of retouching an older character of mine with a new rig i made, however, mid-way through attaching the old parts onto the new rig, the drivers on the new rig that ...
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1answer
39 views

Bone Drivers to Copy Rotation

Can I set up a Driver for the bone on the left to slightly copy the rotation of the selected one when rotating clockwise on its Z axis, and to copy the rotation with higher influence when rotated ...
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1answer
18 views

Parameterize Mesh or object imported from blender file?

I know how to link to an object or mesh inside of another blend file so that I can re-use parts or materials in other blend files. However, is there a way to create a parameterized family of parts, ...
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0answers
23 views

Is it possible to control the visibility of an entire collection with drivers?

I'm trying to utilize custom properties to toggle the visibility of an entire collection on or off. However, when I right click on the restriction toggle for a collection in the outliner, the options ...
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2answers
106 views

Animate size of each letter in text with effector

I'm fairly new to Blender so this might be a really simple question. I want to animate each letter in a text with an effector (different shapes and patterns) in a similar way to these references: ...
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2answers
212 views

Bone driver on X location not working

I created a bone and added copy location, and limit location constraint with world space, because when I selected local space, the bone didn't even move, this works fine and the limitations too, but ...
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0answers
36 views

Blender Dev. Custom properties set hide or non editable

I was wondering if is a way to hide or set as non editable a custom property. In Phyton i can use: object[ label_property ] = value_property I need to said... ...
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0answers
22 views

how do to trigger a driver without doing it in local space?

I want to lift two variables: eyeslashes and the eyelid, both with shapekeys and drivers attached. The eyeslash lift ups the eyelid with child of constraint BUT, i realized that when I lift the entire ...
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1answer
22 views

How do i make shape key driver only show up when it rotates backwards in the x axis

I created a corrective shape key for a quadruped leg, for when i move it backwards. I want the shape key only to appear when the leg rotates backwards in the X axis, but it shows when i rotate the leg ...
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1answer
18 views

IK claw control with driver / controller

I was doing a claw rigging and in-order to perform the claw to open and closing action I want to implement a driver or an object which will provide its translation data along the z-axis, unfortunately,...
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0answers
15 views

Everything invisible in viewport [duplicate]

Regardless of what viewport mode I'm in, everything is completely invisible. For the record I am using Blender 2.80 and this started after a graphics driver update. I've tried reinstalling blender 2.8 ...
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0answers
45 views

How to use a custom property of an object as input for a driver?

I would like to be able to control the power/energy of multiple lamps using a driver. My idea is to have an empty that I would move on the Z axis between 0 and 1 to multiply the energy of each lamp. ...
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1answer
54 views

Where does Blender “connect” to NVIDIA drivers?

Using a NVIDIA GeForce 1060 with Blender 2.8 worked fine until upgrading recently to Debian 10 and Blender 2.9, but now Blender 2.9 does not recognize my NVIDIA GPU in Preferences -> System -> ...
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69 views

Graphics card driver with support for OpenGL 3.3 or higher ERROR

I am trying to access blender remotely via SSH using MobaXterm. I have installed blender on a Linux machine and am trying to access it from a windows machine. I have a NVIDIA Graphics card (GeForce ...
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2answers
57 views

Is there a way to drive “Mute a node” or Toggle “Auto Refresh” in the Image Texture Node in Movie / Sequence Image Mode

Hi There Blender Peeps.. I am in need of some help, I am wanting to make a shortcut in the Item Properties to toggle a node from working, The Item Properties shortcut I speak of is the area Right Side ...
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1answer
24 views

Drivers and value limits on Node Groups

Let's say you want to use drivers to avoid the max value to be lower than the min value on a node group. As you can see the driver works, the value is changing, but is not limiting the max value. ...
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2answers
86 views

How can I make these drivers “Blend” these shapekeys properly and with acuracy?

Is there a way to blend several shape keys with only drivers properly? This seems very possible but complicated to understand, like for example in how to use the equation, and understand it and how to ...
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0answers
20 views

Can't insert drive to Transform ​belong to edit mode?

I want to insert a drive into the transform of the bone's head or object's vertex, but I can't insert it. Is it impossible to insert itself? 2020-12-20 updated I found a way to drive the object's ...
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47 views

How to add driver to dimensions of an object?

I only know how to use the "easy" drivers, that is, you right-click on some input field and select "Add driver" and a little window pops up and you can, for example, define a ...
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0answers
17 views

Scripted expression to make a positive constraint value turn negative as target bone rotates (Empty Head only Art)

I've been avoiding using drivers for a while for this exact reason: No matter how many tutorials I look at, my math-dead head has no idea how use a driver to make one of my action constraint values go ...
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0answers
15 views

How to create a “always have snapping on for this object” driver

I need a way to turn on the "snap during transform" tool for a single bone using drivers. I know there is a tool_settings.use_snapping data path from the ...
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1answer
38 views

Using 'Bake Sound to F-Curve' to Drive Animation — Invalid Python Expression

I am trying to use sound to drive my animation like in the second section of this tutorial (https://www.youtube.com/watch?v=OAes-ITNaGA&ab_channel=quollism) I have created a utility bone with '...
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0answers
25 views

Accessing the Render Engine Type as a String from a Driver Expression

I am trying to make a Render Engine switch for node-trees, that will give control over ignoring or using certain node-chains depending on what render engine is used. This is basically an improvement ...
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1answer
19 views

Keyframing driver location results in unwanted movement of armature and animation

first time posting here! I've reached a bit of an impass. Ultimately I want to hide an object for all animations except one. To do this, I am attempting to use a driver, ...
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0answers
26 views

Controlling the speed of a value?

I need to animate a rotor, so rather than keyframing the Z rotation it would be easier to animate its rotation speed. I saw examples with a driver where a spin value is multiplied by the current frame,...
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2answers
65 views

Use an object as a Driver variable

I have a function for a driver that expects 2 objects as arguments, and I can't find a way to set the variable as the Object ID, only a single property of that object. Is that possible?
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1answer
12 views

Security Popup about a Driver when Appending a Material

Every time I append one specific material from my library, I am given this error: I usually just ignore it and continue on my merry way. However today I decided to fix it. I don't know anything about ...
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1answer
47 views

How to disable or enable a constraint of a bone, by a rotation of another bone?

I want bone A when starts to rotate, disables a constraint on bone B. (The eye symbol) My guess is by using a driver. BUT, I don't have any clue to do it. Added info: Start to rotate means, when I ...
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1answer
31 views

Using a driver to control two shapekeys but triggering the second shapekey when the bone hits a certain value

I'm trying to use a single bone to control a blink on a cartoony character it's normally pretty simple but for this I need the eyelids to disappear at a certain point like when the eyelids are ...
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2answers
88 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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