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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Use Spreadsheet for Extruded Profiles

I use Blender for technical constructions. Therefore I created for example a bunch of HEA profiles (https://www.ezzat.org/de/Querschnittswerte/gewalzt/I/hea.php). I saved each of them in a single *....
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3 answers
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How to connect visibility of object with visibility of bone?

I have an armature with multiple bones and a different object connected to each bone when I hide my bone I want the object that is connected to it to hide as well How do I achieve this? maybe via ...
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Difficult to phrase blender problem with a rig using the tangent function

What I want to happen, when I move the target bone, is for the Child bone to move only on the X and Y axis, NOT THE Z. I figured I would use the rotational values of the constrained bone as drivers ...
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  • 11
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Multiple shape keys triggering at the wrong time causing unwanted deformations

I am trying to use corrective shape keys to fix my characters elbow deformations However when I try to use two shape keys together they cause bad deformations On the elbow of my character, I tried to ...
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Object Normals to follow Rig

I've been searching far and wide for this solution lol. Does anyone know how to make object normal maps connect and follow a rig 'proportionately'? My example here shows it's possible but it affects ...
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  • 85
3 votes
1 answer
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Want to use drive vertex weightings

I would like to reduce the proportional weights of vertices on a Vertex Group as a bone grows distant from another bone. An example would be to somehow use a function that would return a vertex ...
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Object Respond to it's own Driver

I have a situation where I am using my driver tool rapidSDK but when I rotate my character, I have no expression or other buttons allowing it to respond to the driver akin how when the driver was ...
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  • 85
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1 answer
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How to move bones with shape key

A shape key for a model Im working with makes the legs longer. The issue is that the bones look offplace due to the mesh changes. Is there a way to make necessary bones move with the shape key to make ...
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1 answer
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Is it possible to drive a procedural texture eye from a shape key?

I used 'FaceIt' to create some shape keys that also control eye movement. Since my eyes are procedural, I used dummy spheres for the eyes to bind the rig. The dummy eyes move fine with the shape keys,...
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4 votes
3 answers
312 views

driver not working [duplicate]

I want to use the folowing driver: abs(((frame+45) % 90)-45) But it does nothing. I tried also #abs and ...
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1 vote
1 answer
29 views

How to find a length of a single bone (Drivers)?

I'm trying to get a length of a single bone but having no luck to do it when it's last bone in chain. Need that value for custom property (which I need for drivers). So far, I've figured out how to ...
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1 answer
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Driver : delta Z between two bones?

I want to drive a bone X rotation with a value based on two other bones Z position TargetBone.rotation.x = BoneA.location.Z - BoneB.location.Z but I dont understand how to do that with dirvers it is ...
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1 vote
1 answer
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driver for influence

I have this formula for my driver "1 if (var <= 0.4) else -1" and it works ok, but I want to add slow move from 1 to -1 and not just cut off. Or maybe slow down in the end 0 to -1.
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1 vote
2 answers
53 views

How to get Z Euler Rotation value of constrained object?

I have a shader that uses the Z rotation of an empty (called Sara_Origin) through drivers to calculate the shadows on the face. The empty's rotation is constrained to the head bone of the character ...
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1 answer
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Drivers not working

Im trying to make driver for shapekeys but for some reason it doesn't work for me. Basically when I add driver to the shapekey it's shown as "mute" in the drivers editor and it doesn't work. ...
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1 answer
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How could i make sure the sole is constantly moving, not bouncing?

There is a tank whose tank track movement is given by a Cylinder that has Rigid Body physics, but the tank track bounces. How fix this? (I made the movement of the tank track with the help of a Driver....
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How do I fix it so that it doesn't move the tank track when I'm rotating?

I made a base tank for the test which has the problem that if the tank turns, the track or move backward or move forward. Could this be make so that it does not move forward and backward the tank ...
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2 answers
28 views

Turning mesh shapes into shape keys

I've imported into Blender a human figure made and rigged in Makehuman. It has about 50 ready-made face shapes but I am unable to control them although their shape-key drivers are visible in the shape-...
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5 votes
1 answer
77 views

How do I make a driver alway move forward even if the source moves backwards?

How do I make a "driver" that works like this? If I move object1 +X forward, then object 2 +X going forward, but if I move object1 -X backwards, also object2 +X going forward.
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1 answer
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Making object show up when Custom Property condition is met

My objective here is to make an object displaying the letters FK to show up inside the gear when the 1 - FK Custom Property is ...
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1 vote
1 answer
31 views

How to use bones to control the shape key checkbox

I'm a dump.... When I making my rig, I somehow knew how to control the shape key's checkbox by the local location of the bone. here is how it work looks like: And recently I find a bug of my rig. ...
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0 answers
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How do I drive F-curve Modifier properties?

I want to control the F-curve Modifier properties such as amplitude, phase multiplier, etc, by means of a driver/custom property. Modifier properties don't appear to be driver enabled or animatable. ...
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1 vote
1 answer
18 views

Copying drivers and transform_space attribute

I am trying to copy shape keys drivers from one mesh to another. For some reason when I copy over the variables attributes the transform_space attribute doesn't change. I am printing the attribute ...
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6 votes
2 answers
180 views

How can I convert two numbers to 0 - 1 range in Driver Scripted Expression?

I have a shapekey driven by a bone. I want to configure the shapekey's driver such that scaling the bone to 0.3 results in a shapekey value of 1, and scaling the bone to 1 results in a shapekey value ...
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1 answer
45 views

How to create a driver and bone to manipulate time offset between 2 images

Using Blender 3.02 Hi all, I would like to make a 'slider' to switch between two images a la South Park. Here is what I understand, and where I get lost. If anyone could help I would appreciate it. I ...
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1 vote
1 answer
37 views

How does one use Fluid Simulation offset number correctly? Blender 3.1

Desired Goal Use the offset in the Fluid Simulation Panel to read in 1 or more frames for the 3D View Window. Reuse the mesh data created from a fluid simulation. A Read Only status is desired. ...
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20 views

Controlling Shapekey with Empty (Appear or Dissapear)

I'd like to control my expressions with empties. So I'd like to have 4 empties: Laugh Sad Suprised Angry These will be in expression collection. And when I set the "expression empty" ...
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0 answers
21 views

run an operator based on a pre-existing button or operator

I want to remove a driver with a custom property on the active pose bone. ...
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2 votes
1 answer
67 views

How to scale multiple objects with different phase of a sinusoidal wave?

Being a beginner in Blender, I'm stuck with a basic (maybe for experts) problem. Please help me out. Suppose a bunch of uv spheres is placed at equal distance on a plane (or grid). The animation will ...
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1 vote
0 answers
25 views

How do you mark (and measure) the intersection of two lines without adding vertices?

My issue is that I would like to mark and measure the intersection of two lines so that I can run a driver off the resulting measurement. I thought of adding a vertex, however this will cause the line ...
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2 votes
1 answer
19 views

How to set light paths with drivers based on if the user is rendering

I am setting up a project where while in the viewport, glossy light paths must be set to 0. But when the user renders I need to set glossy paths to 1. I have no experience with blender python or ...
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0 votes
1 answer
38 views

how to make drivers turn on and off at random

im making a scene where the visibility of these scribbles are controlled by the rotation of a controller object. its usable but i want the drivers to select which scribble is visible at random instead ...
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0 answers
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Keyframing custom properties in panel not working

I'm basically going nuts over this one.. well, I am actually I'm trying to add keyframe/#frame from my addons panel. I have created custom properties on the property group and everything is working as ...
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Driver for shape key does not work along local space

So I am working on a project that requires an armature, I generated a rig with rigify and a few of the facial animations I created, I used shape keys to manage them. For a human meta-rig, I was able ...
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0 votes
0 answers
44 views

Exporting IK animation to .gltf format breaks the model

I have rigged and animated a bird using IK and drivers. When I try to export it to gltf 2.0 format, IK bones don't seem to be used in the exported animation and there is a place where the skinning is ...
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0 votes
1 answer
26 views

Where is the cursor for Driver Editor?

I'm trying to create corrective shape keys using the Driver Editor. I've looked up tutorials on the web but I seem to be the only one who's missing a cursor like in the graph and timeline editor which ...
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0 votes
1 answer
19 views

Shapekeys Drivers

Blend File I made my first shapekey react to the left tight X rotation , but it's isn't perfect , how can i fix this? The shapekey's deformation do not start soon enough. PS: Left thigh forward ...
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1 vote
1 answer
20 views

Corrective shapekey bone rotation

When i set up my shapekey to react to a bone rotation , it will only react to a positive value. How can i make it react to a bone negative rotation instead? I only get " x rotation " in my ...
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0 votes
0 answers
17 views

Custom Property Folders (not with python?)

sort of new to blender. Been messing with custom properties and drivers, was wondering if there is a way to make a folder or group for organizational purposes (without python scripts). If a python ...
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1 vote
1 answer
43 views

Driver in Compositing Node Group doesn't update

I have the same problem as already described and solved here: In Compositor, is it possible to change multiple node values simultaneously even though there is no input socket? Unfortunately, the ...
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  • 557
2 votes
1 answer
42 views

Shape Key: Delete Specific Driver

I'm trying to delete the driver of specific shape keys. I have used the code below, which deletes a shape key, using key_idx to select an entry key from the list. <...
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  • 290
0 votes
1 answer
44 views

How to detect absolute motion?

At the outset I warn that I don't know if absolute movement is the correct term. What I want to show with the image below, is that it moves in 2 axes. So I want to know how to add these 2 variations ...
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0 votes
0 answers
14 views

Robust way to translate animation temporarily, including particules/quick explode

How can I robustly move an animation temporarily? When I move the keyframes in the dopesheet, it won't move for instance the particle frame start/end. For instance, I just selected the cube and did &...
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1 vote
1 answer
42 views

I tried to make a driver to control the rotation speed of my object. When I try to animate it it seems to slow down. How do I fix the driver?

Blender file Just a bunch of cubes and one single bone, with the custom property and the driver. https://gfycat.com/coldablecowbird So I've trying to work this a driver to control the rotation speed, ...
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0 votes
1 answer
26 views

Driver Expression: Bind "Visibility in Viewport" to self.parent > hide_render?

I need to setup a driver to bind the "Visibility in Viewport" property of on object to its parent "hide_render" property. I want to use an expression only. So I did lots of ...
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0 votes
0 answers
428 views

Blender 3.1 Graphics card OpenGL 3.3 HELP!

I have a DESKTOP-ER33EN5 computer, running with a Windows 10. Although i had trouble opening Blender because of the "Unsupported Graphics Card or Driver". So i download this file "...
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1 vote
0 answers
62 views

Use `self` in drivers to return a custom properties,

I'm trying to access in a driver the custom property of an object using self as I don't need to specify manually the object everytime. However, I can't find the ...
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0 votes
0 answers
21 views

How can I put a luminance map created by a shader node into a driver?

I have set up a node like this where the luminance is determined by the position of the cube duplicated in the geometry node, and I would like to use it to express a delay, where the playback position ...
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2 votes
1 answer
69 views

Driver object data property will generate a "Could not find op_from" warning

I set a custom property on the object data and referred to it from the driver, but I don't understand the following two points. The following warning is displayed on the system console ...
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  • 126
2 votes
1 answer
217 views

How to add a driver by python for a custom property?

I just want to link a custom property from the texture data to a mapping node Scale input in the material but I can't get how to do it from examples ...
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