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Questions tagged [drivers]

Blender drivers are a way to control values of properties by means of a function, or a mathematical expression. Use this tag for questions about Blender drivers.

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Adding drivers to mesh vertices and saving blend file crashes python script non-deterministically [closed]

I am using bpy version 4.1.0 (and Python v3.11.4) to write a blender python script and I've run into a really strange issue. I am trying to add drivers to ...
niran90's user avatar
  • 101
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1 answer
28 views

Python While Loop Not Working?

I was trying to make an infinite while loop for my project, however, for some reason the code refuses to proceed past the first iteration. For reference, the driver is meant to make the circle mesh ...
Chris Moliere's user avatar
1 vote
0 answers
14 views

Adding Delay in Between Changes in Driver?

I'm trying to create a blinking/flickering light effect which can be activated with a driver, and came up with this very messy driver expression which I found does work to an extent. However, I want ...
Chris Moliere's user avatar
1 vote
1 answer
38 views

Control when a light starts blinking?

I want to animate a blinking light controlled by keyframes, however, I only want the action to start at a certain driver value controlled by a an object’s position - so if I had multiples of the light ...
Chris Moliere's user avatar
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0 answers
28 views

Is it possible to setup driver value from one to zero? [closed]

Is it possible to somehow configure the driver to always be 1, but when I move the bone (controller/button) it becomes 0?
Pandora Ingrid's user avatar
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12 views

How to display custom bone properties in Pose Mode at all times?

I've recently made IK-FK switch drivers for my rig experiment in Blender 4.1.0 using this tutorial, but I have to select the gear bone above the character's head in Pose Mode to access the IK-FK ...
Daffodil's user avatar
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0 answers
27 views

How to add a trigger to a driver?

I have a bone(Bone A) that is rotating another bone(Bone B) with a driver with a custom expression, and it works. But I only want Bone B to start rotating after Bone A has rotated on the y axis 45º. ...
Sculptoz's user avatar
1 vote
0 answers
37 views

How can I preserve Driver links between an add-on and Geometry Nodes?

Blender 4.1 makes it possible to create a Driver between an add-on driven value ("Copy as New Driver") and a Geometry Node value ("Paste Driver") but the link is working only ...
Alio's user avatar
  • 85
3 votes
1 answer
81 views

how do I constrain a shape key

I made a corrective shape key for a model's hip area, and it works fine when the leg bends forward. But if the leg bends back, the shape key also activates, and then there's a bulge in the upper thigh ...
SpanishCarmine's user avatar
0 votes
1 answer
20 views

Driving an Objects animation from a Physics Simulation on another Object

I am a Blender beginner but very familiar with 3d workflow with a background in After Effects. I have a very high poly/face count mesh Ball that I am trying to animate using simple physics simulation ...
Tom Akerman's user avatar
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17 views

Can't "Copy Data Path". How do I fix it?

This is my first time using blender and I was trying to setup a driving system for FK/IK Switch for the arms but when I tried to copy data path for the Main bone, I couldnt? This is what my screen ...
Jaehee Kim's user avatar
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9 views

Controlling a shape key with multiple custom properties

A model I'm working with has multiple shape keys that change the shape of the body. What I'm trying to do is set up a custom property to make a "preset" for some of these shape keys. (i.e. ...
Ethan's user avatar
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1 answer
35 views

Blender 4.1 how to correctly use "#Frame"?

How to correctly use #Frame to rotate camera around object? Parent camera to empty. select Empty. Rotation Z: #Frame/30 Syntax ...
CountQuadula's user avatar
1 vote
1 answer
21 views

Using drivers to control animation, the object becomes offset in final position

I've received some great support on this channel for using drivers to control an object from initial to final position. In a nutshell, you use keyframes to control the animation on your object > ...
mdivjak's user avatar
  • 45
1 vote
1 answer
35 views

How to use drivers to control animation of an object from a starting position to a final position

I'm trying to animate the translates and rotates of an object from rest position to final position and control this with a 0-1 slider in a similar way to using driven keys in Maya. In a test case, I ...
mdivjak's user avatar
  • 45
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0 answers
32 views

Camera-Based Value Driver

Does anyone know how this is working: Goal: I'm trying to achieve this ability with drivers: I notice it has what I call the "feedback loop", where if you angle the object and/or angle the ...
FIndTheFix's user avatar
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0 answers
15 views

Multiple Shape Key Driver

Im just new to drivers I figure out how to do it with bones but when it comes to multiple shape keys Im bit confused and need help.. For example I have 1 shape key that works with bone it makes skin ...
Furkan Can Kaya's user avatar
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13 views

Path to pin driver to action on bones

i have bones with actions. When i use that actions i wanna change value some drivers on other object. How can i do that? i weak in python(
UMANETS's user avatar
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1 vote
1 answer
22 views

Shape Keys negative to positive range relation

I would like to get advice from someone who is familiar with the internal mechanism of "Shape Keys(SK)". SKs can have not only positive but also negative ranges. I would like to understand ...
Andrew's user avatar
  • 11
0 votes
1 answer
63 views

How to link object rotation to an image sequence?

https://www.instagram.com/p/C6O9QKzyvCX/ ^^ I am trying to emulate this. The artist rotates a block and as it rotates the image changes alongside it to match the rotation of the block. My thinking is ...
Ben Newton's user avatar
0 votes
1 answer
235 views

How do I calculate sum per frame?

I'm trying to find a way to control the rotation speed of an object. First I tried rotating it using a driver and then multiplying that driver with a control value that ranges between 0 (standing ...
Lynx095's user avatar
  • 23
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0 answers
18 views

how to make driven scene properties update in the UI?

I am writing an addon that has a property which needs the #frame driver, but when I play the timeline automatically (space key to play), the value doesn't update in the UI. However, when you drag the ...
baby boss's user avatar
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1 vote
0 answers
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How to specify current frame in file path

I'm having an issue where I need to read image sequences and UDIMs at the same time. The UDIM can be specified in brackets <like this> (given that the mode is ...
Anson Savage's user avatar
  • 3,412
1 vote
1 answer
19 views

Driver Scripted expression showing the wrong value

So I have a basic driver that is supposed to divide 360º between the number of copies on an array modifier (count). This way the empty in the middle, which is being used in the array modifier of the ...
Cornivius's user avatar
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0 votes
1 answer
91 views

GeometryNodes: computed custom "angle" attribute and how to use it in a driver

This is my second question in the forum. I'd rather ask instead of just waiting, though i think this might be something to fix or even, maybe logic that is not yet intended. I ll explain: i have a ...
3mm3ttBr0wn82's user avatar
1 vote
0 answers
28 views

How to make the position property of an object wiggle only when it is moving?

I have an object with two simple position keyframes. I would like to add some randomness to the animation but only while it is moving. As soon as it stops, the wiggle should stop, too. In After ...
MikeKnight's user avatar
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0 answers
21 views

Dependence of rotation on local position. Need driver or script

Dependence of rotation on local position. The vector passes through zero, and the rotation changes. How can I fix it using drivers or a script?
user avatar
1 vote
0 answers
39 views

Constraints Fail when Using Input Variables in Drivers

I'm encountering an issue in Blender where constraints stop working properly when input variables are used in drivers. Here's the setup: I have a camera and a cube (scaled to 0 on the Z so it looks ...
David.Rodrigues's user avatar
0 votes
1 answer
18 views

Animating material property from a linked collection

I have a linked collection with several objects and I want to animate hue value of one of the materials. Following this answer I have a custom property linked to my hue driver and this works perfectly ...
16ar's user avatar
  • 57
1 vote
2 answers
37 views

Add Random seed slider to a node group to affect other input values randomly

I Hope someone can help me with that, can't find any solution fewwww I'm trying to integrate a random seed slider to my nodegroup! Basically I would love that slider to change randomly all the other ...
Petaralazara's user avatar
0 votes
1 answer
39 views

need help with finding volume data path to be used as a driver

i want to create a driver that uses an object's volume (not scale) to determine the size of another object. I know the volume of the object, as i got it from the '3D-Print Toolbox' built-in addon, but ...
Photekh's user avatar
3 votes
1 answer
67 views

Control specific UVs on a texture map (Reference Vertex Group in Material Nodes)?

I want to do something like setting up a driver on a bone's local rotation to control a UV island's translation on a texture map, I'm having trouble trying to use multiple drivers on multiple UV ...
Rejala's user avatar
  • 53
0 votes
1 answer
11 views

how can I find what objects reference a custom property?

I am animating a figure. The rig has over 200 "drivers" which point to custom properties on the armature. I cannot figure out how to trace the custom properties into the armature itself. ...
user1071914's user avatar
0 votes
0 answers
39 views

how to change point light color from geo nodes using drivers

I have this geo nodes setup where a point light is instanced in the middle of explosion i want this hue slider to somehow affect the Color or hue of point light in EEVEE
AAA's user avatar
  • 25
0 votes
0 answers
31 views

Baked audio to fcurve>fcurve through a driver to animate a hook empty to deform geometry>works great... BUT

I've asked this question a couple of times in a couple of places and it's driving me crazy. I've baked drum beat to the x location fcurve channel of an icosphere so that it bumps to the positive x and ...
James Dunbar's user avatar
0 votes
0 answers
37 views

How can i animate "swing"synced to music?

I'm animating with audio baked to f-curves and applying that translation data to an empty hook object using basic drivers to deform geometry. Easy enough to make the "hips" bump to one ...
James Dunbar's user avatar
0 votes
0 answers
8 views

how to separate driver settings on two physics caches

I need to cease a physics simulation for a series of frames, and possibly re-bake the simulation when I adjust the animation by scaling areas that will include certain timeline markers. As an example ...
james_t's user avatar
  • 5,549
0 votes
1 answer
29 views

how to add driver for geo nodes property

I want to add a driver so that the Hue Value Affects the Z location of an external cube
AAA's user avatar
  • 25
0 votes
1 answer
60 views

Rigging and animating camshaft follow-mechanism

I'm really new to blender and don't know much about all the stuff. But here is my problem: How can I rig this camshaft, so that it pushes down the rocker arm beneath it, which then puches the valve (...
Philipp's user avatar
1 vote
1 answer
27 views

Why don't the face bones on this model work?

I downloaded a 3D mesh using the "Blender Kit" plug-in in this specific case a woman. This mesh has the rig all over the body, in fact (in pose mode) if I try to move: arms, legs, hands etc.....
Ivan Poggi's user avatar
0 votes
1 answer
43 views

Driver expression sinus-function jumps when using if-statement

So I am fairly new to belnder and I got myself into a problem. I want to rig that camshaft so that the cam pushes down the rocker arm beneath it. With blender pyhsics it does not really work so I ...
Philipp's user avatar
0 votes
1 answer
21 views

Make #frame active only in some frames

I made a gear chain and I used #frame/7 to make it rotate continously, and I wanted to know if there is a way to make it start and stop after specific frames and also if there is a way to ease in and ...
ViikDraws's user avatar
1 vote
2 answers
38 views

Can I use Rotational Difference value as Transformation constraint Target source?

I need to use driver's "Rotational Difference" type value to move armature bones. Rotational Difference can only be generated inside Driver so I make a new driver, which generates Rotational ...
Yokomizo's user avatar
  • 415
0 votes
1 answer
39 views

How to make a driver/shape key cancel out another driver/shape key?

The idea I have is fairly simple in concept: I'd like to enable two shape keys independently (like a normal face rig slider), but have one of those shape keys take priority over the other. My exact ...
Excretioner's user avatar
0 votes
2 answers
36 views

Driver to change the seed every 4 frames? (Replicating "Step" Function in LineArt Modifier)

I am trying to work out an easy, repeatable solution to this question: I am using Line Art in Blender 4.0, not freestyle, but the problem persists. I am trying to use a driver on the Noise Seed in the ...
heath's user avatar
  • 1
2 votes
1 answer
94 views

Add a driver to a material property using Python

Is it possible to add a driver to a property in a shader using Python? I managed to get driver_add working for other properties, but not shader properties. I can also print the property just fine. <...
Walter's user avatar
  • 359
0 votes
0 answers
16 views

Moving an image with Video Editor expressions frame offset as a constant

I want to move a 2D image at a constant speed using the frame count in the video editor. I also need to subtract the images self height so it starts from the top. Pseudocode of an expression into the ...
displayname's user avatar
0 votes
0 answers
36 views

Simple spring animation for game that does not stretch

I wanted to create spring animation for my model's legs in unreal engine 5. First I tried to scale bones, and use contraints to match the height. It worked but spring was deformed, it lost circular ...
Grzegorz Krug's user avatar
0 votes
0 answers
25 views

Help with a "hose" deformation

I'm stuck trying to bend a hose that should be attached in a sprayer bar of a tractor but I cannot find a way to bend it properly. It might be a simple thing to do but I still didn't figured out how ...
Marcelo Wieczorek's user avatar
2 votes
3 answers
296 views

How to calculate object's location after rotation around a pivot?

I'm trying to create a capsule object in Blender, which consists of two half-spheres and a tube between them, and i need to be able to move it around as if it was a single object and adjust the ...
Moff's user avatar
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