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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having trouble looping alembic animation

I tried following the suggestion of another answer Loop alembic animation but unfortunately it is not working for me and the animation is still not looping. it will just stop after the animation is ...
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Access driver for a specific shape key

I know of this API: drivers = bpy.data.shape_keys['Key.002'].animation_data.drivers But it gives all the drivers in the collection. What I need is the driver for ...
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wheels not rotating when car moves in car rig pro 2.2? [closed]

[The main settings.[I recently downloaded a pirated version of car rig pro on cgpersia. i know its not right but I'm not a bad person. My parents say blender is a waste of time. I will definitely pay ...
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How to get multiple random animated shape keys?

First time asking here! I have been using Blender for over a year now for: modelling, sculpting, trying out rigging 3D models, and making small animations. The current piece I am working on has this ...
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Blender 2.93 stops recognizing my graphics card (Nvidia RTX 2060) every few hours. Ubuntu 21.04

I keep having to restart my pc in order to get blender to use my graphics card (NVidia RTX 2060). It works great until it doesn't. I refresh a screen in render mode and there's just nothing there. ...
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copy and paste object ID to one drive to another

so i'm working on a rig that has a lot of drivers and every driver needs a object ID to function the problem is that i need to asign my rig to every driver manually there is a easiest way to do this? ...
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1answer
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How can I make one object affect the z-axis transformation of another object?

(Sorry for the confusing title, I didn't know how to explain this) I have a sphere and a lot of tiles in a scene: I want all the tiles to move up and down when the sphere gets close to them: I tried ...
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How to auto orient an object according to its motion path

This seems like such a simple request, but I can't find any reference to it anywhere. How do you auto-orient an object so that it faces along its motion path. I don't want to use a path object to ...
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How to transfer world rotation to local axis via drivers or constraints? [duplicate]

I would like to drive/constrain a local rotation axis of an target object by using drivers or constrain modifiers. Is there a way to do this in Blender? I can copy rotation values by using a copy ...
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1answer
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Control the scale of an object by another parameter (length of another object)?

I have this lever: When I move that selected face (of the cube) in a local way on the X axis... I want that parameter to control the scale of the sphere (when the length of the lever is short, the ...
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1answer
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Driving a Driver with a Hotkey

Is there a way to access a driver with a hotkey? I am getting tired of selecting a data block in order to drive a driver. I want a quick way to turn on and off many modifiers so I can toggle between ...
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Can I link a compositor node with drivers getting data from the current file?

I've created a compositor node group that will overlay my signature (a png) at a configurable location and scale on top of a composited image. In order to position and scale it correctly, so that ...
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1answer
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Can I create a custom property for the modifier stack?

I'm adding expression drivers to my modifiers structure. One of the variables I constantly use in different modifiers is the number of frames. Is there any way to attach the driver to a custom ...
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Using sound frequency as a driver

I am trying to do an animation where I want to use the frequency of sound as a driver instead of the amplitude. I have already done a couple of experiments using the bake sound to curves but that ...
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Change variables in drivers with a Python script?

I have a group of 108 light objects with emission channels. (Because this is Eevee they aren't actual light sources but just pretty props.) I want to be able to control both the brightness and color ...
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cannot add driver for fcurve noise values

I am not able to add any driver to this noise-modifier values. Ok, i can accept that it is that way. But until now nearly every value i could "drive" with drivers. Is there a special reason ...
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Access to object properties via drivers in Geometry Nodes

I noticed that when I use geometry nodes to scatter object instances they inherit the scaling of the parent object. I would like to compensate that by dividing the instances by the parent scale first, ...
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How do i calculate the displacement of a certain bone

I'm trying to simulate the mechanism of the differential gear box using only math but, to do this i need to drive the weel rotation using a guide bone with a child of constraint targeting the root. My ...
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1answer
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How to access now rendering object from a driver into a material node property?

When defining drivers for Material Node properties, self references the Node itself. While this may have its uses, it would be great to be able to access the object ...
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Where are custom variables stored?

I am working on a rig generated from the metarig, and I noticed the pole vector targets are enabled by a driver with the variable "pose.bones["thigh_parent.R"]["pole_vector"]&...
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2answers
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Geometry nodes after Array

I am exploring the new geometry nodes, my goal is to create a very simple procedural tree: a brown cone and a few green pyramids on top of it 🌲. I would like to apply random variations to the ...
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2.93 How to compare active view layer in shader editor with driver?

I need to update shader settings for the environment according to the active view layer. I would like to just have a Value node that checks if the active view layer is a specific view layer. Something ...
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These drivers are identical according to the UI. Why does the scripted one not work?

I have put a driver on the tilt attribute of a bezier curve, and linked it to a hook manually first to see if it would work. The result of this is as follows: And here you can see that the bezier ...
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Get keyframes with offset for walking animation

I am making walking animation. I always tweak Right foot IK animation values but I want to re-use it as Left foot IK animation. If I can do this I don't need to copy Right foot IK animation keyframes ...
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Rotate N objects identically, but with unique variations

I have over half a dozen identical objects in a scene, and I want to slowly rotate them around a single axis (their individual vertical axes) by setting parameters on each instance of the object, ...
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1answer
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Python: get driver value / calc driver expression

How to get driver value via python? dr = bpy.data.objects["Cube"].animation_data.drivers[0]
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Adding a driver to the tilt attribute of a bezier curve to link it to a hook using a python script

I started using blender and python a couple weeks ago, and have been doing okay with the documentation that is available on the internet. Now I ran into a problem though. I am trying use a hook as a ...
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How to avoid dependency cycle when creating material driver in python?

I'm using python to create a blender scene; in that I'm setting up a driver for the opacity of a PrincipledBSDF based on two ShaderNodeValue nodes. When I run it and load the resulting blendfile, I ...
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Can I make a node group driver independent of materials?

I made a node group that contains a color ramp, and in order to control the color ramp from the outside I read that I have to use drivers. I have never used drivers before and feel lost right now. So ...
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1answer
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How to make a rig like curve handle with control points

With curves, you get good control points that move with the middle handle. I'd like to do that with bones but I'm experiencing problems with dependency cycles. How am I supposed to do that? i want to ...
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RX 460 OpenCL compatibility, “no compatible ..found”

I had posted something about this but at that point was unsure if I had the pro drivers installed. I know I installed the pro drivers and from everything I've read and what I can tell, they are what ...
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Radeon RX 570 poor work in Blender Cycles

My RX 570 4GB GPU is just enormous headache when in comes to rendering in Cycles. Most of the time my computer freezes and GPU driver crashes so I have to reset and wait for a looong 10 minutes reload ...
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How to copy constraint to other object and keep the drivers?

I add a constraint to an object, and in the parameter i attach drivers. Now when i copy/paste this constraint to other objects, all the drivers are gone. The drivers are converted automatically into ...
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1answer
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Armature bone rotation values not changing when using inverse kinematics

I'm trying to have drivers activate based on certain bone rotation values. However when the bones are moved as a result of the IK setup their rotation values do not change at all. Edit: File ...
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Symmetry issue of the rigging and driver

I copied and pasted the weight and driver of The rigt side to The left side The bone axis is same, driver setting is same except the inner setting is L to R The one of difference is, the left side ...
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2answers
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How to use drivers in order to allow a rotation of an object in the x axis to be mirrored as a rotation in the y axis?

Is there anyway to make an object rotate for the same value in the z axis when the y axis rotation is changed. It is to rotate the door as attached, as it needs to rotate at an angle.
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1answer
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Driver for half-speed rotation of gear completes two half rotations

I am trying to animate this set of planetary gears. The sun gear (blue) is driven by a crankshaft which drives other parts of the animation not shown here. I have drivers set up for the planetary ...
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Creating a driver that references a value at a given frame

Is there a way to create a driver, that reads a value at an arbitrary time? Example: An object that follows an other object with a delay.
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Drivers disable lights

I wanted to use drivers to finely control the output of my scene lamps. But attaching a driver to the "Power" field causes the lamp to not render at all, even though the number I want is ...
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Scripting: adding drivers to multiple objects from one property

I am making an exploding ship, and I am trying to make all the pieces visible and physically active at the same time by driving their properties with an empty’s custom property. Since there are over ...
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RX 460 "no compatible GPUs found for path tracing

Is this correct? Am I unable to use an Rx 460 for cycles rendering? I was going to CPU + GPU, but this is whats showing under all categories. I'm using Ubuntu 20.04.2, and I just installed the amdgpu-...
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1answer
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How to use the equation of the circle in the driver expression?

How to use the equation of the circle in the driver expression?
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1answer
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Can't edit driven number value, see graph editor for the driver setup

Good day. I get the error "Can't edit driven number value, see graph editor for the driver setup." I have a leg that I will bend. To make it look good, I decided to follow this video (https:/...
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1answer
60 views

How to use a driver to pan and zoom an image

I am trying to follow this answer: Pan or zoom in the VSE (accepted answer) After I right click on x offset and select Add driver...
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40 views

Blender driver object “self” reference

I have an object with a driver, that I'll need to dupplicate like 100 times. Is there a way to reference the current object using a driver, in the input variable object, like, referencing itself, ...
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2answers
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Appending rig with constraints and drivers

i appended a rig from one blend file to current working one. the rig is transferred but the constraints are no more there and neither the drivers. How i transfer the constraints and drivers as well?
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1answer
124 views

How do you convert a rotation to use as a value between 0 and 1?

Basically I have a bone that rotates, and I want to use it's rotation to drive an Influence of another bone that ranges between 0 and 1... For example: If the bone rotates 0 degrees, the value is 0.0 ...
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How use lerp python function at driver expression? [duplicate]

I'm trying to use a lerp function, but Blender gives an error. What is the problem? The problem appears exactly when I try to do something with a lerp. The rest of the driver works fine.
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1answer
54 views

How can I automatically move a robot's body to the correct height based on its leg(s) rotation?

When I rotate the leg the body or the luggage bag should come down slowly. Which constraint or any other way will achieve this? video Blend File
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Create Object coordinates from Object's Loc/Rot/Scale?

When you use a Texture Coordinate node's Object coordinates with an empty object selected in the dropdown, the transforms of the empty effect the texture its plugged into. You get the Object's Loc/Rot/...

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