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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6 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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Limit driver to certain location range

I am experimenting with rigging, and one of the components requires a corrective shapekey that is based on the location of a bone. The driver needs to only activate between a certain range (let's say -...
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2answers
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No animation in Curves on using Bake sound to fcurves

In Blender2.9 , on adding location drivers to the origin of a Curve, there is no animation eventhough the location values are generated by baking sound to fcurves. ...
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29 views

Use MeasureIt value in driver

Do values from the MeasureIt add-on have a data path we can point to when using drivers ? I've scrolled through the code but couldn't figure it out.
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1answer
52 views

Blender 2.9 scripting, how to get the name of the driven property

I'm trying to get the name of the property that's been affected by a driver for a certain object, what I did so far: ...
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27 views

What is the Expression Script to add both Location and Rotation in Drivers?

Hi guys I'm asking for a simple question. I have a facial rig with several components. I made a shapekey for corrective so the bone can drive both of the components. For the eyebrows, I added ...
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1answer
30 views

Contrasted triangles on interface and transparent materials in viewport and material view

System Information Operating system: Linux-5.8.0-25-generic-x86_64-with-debian-bullseye-sid 64 Bits Graphics card: AMD TURKS (DRM 2.50.0 / 5.8.0-25-generic, LLVM 11.0.0) X.Org 3.3 (Core Profile) Mesa ...
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22 views

Access to constraint modified value

I modelled a window and add an armature to it. There is a bone called Window that's used to open the window and a bone called ...
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2answers
79 views

Driving an Object at Half the Speed of the main Object

Hi I'm animating my Engines Rotating assemblies and I want to Drive the Cams at Half the Speed of the Crank (Example: Crank is going at 1 and the Cams are at 0.5) what is the operation to make this ...
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1answer
65 views

How to use different types of data blocks for driver variables?

I know that the content of text can be registered through a user-defined function and entered in the Expressions box. But how can I use text as a data block for variables, as shown in the image? ...
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1answer
24 views

True False Drivers

I'd like to enable/disable a constraint based on 'influence' being 0 or 1. Here is a picture of my situation. I think I'm very close, I'm just not sure how to tell Blender the command. Thank you!
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14 views

How do I set up a driver that will be effected by an object location and also changes based on that location

So I want to a driver that will animate a shape key as another object moves along the y axis. But at a certain point, lets say past 6 units, I want the shape key to decrease instead. How could I do ...
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“Can't edit this property from an override data-block” while adding driver

I tried to add a driver to a custom property after library override. And I checked the message, "Can't edit this property from an override data-block." On the other hand, proxy allowed ...
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1answer
47 views

how to control the same value on multiple different materials with an object's z location?

You can do this with drivers, and I've seen multiple blender channels that use an empty to control the value of multiple lights. i was wondering how i would use drivers to control the value of ...
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27 views

map 2d coordinates to 1d index using blender drivers

is there a clean way to convert a 2d vector ( from relative position between two objects ) to 1d index using blender drivers? it should be extendable to add more items later . it is useful to control ...
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17 views

How can I use animate/toggle render visibility on objects using one property?

I have a group of objects all sitting in the same 3D space. I want to be able to assign each object a number and by inputting that number into a field have only that object visible on that frame. Then ...
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1answer
28 views

How to lock an object so is always showing the same face when rotates

I'm trying to animate a bicycle and I have a question related to the pedals. Using drivers on the gear and the wheels I have got the automatic rotation of the bicycle as it moves through the y-axis. ...
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2answers
34 views

How to get the data path of object dimensions for using in drivers?

Is there a way to get the data path of object dimensions for using in drivers? How to get the variable for a specific object y-dimensions for example? Thank you Chris
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27 views

Using a 360 rotation to drive another object so that it rotates 0-180 and then again 0-180 [duplicate]

I've got a bit of a remapping problem with my driver setup. Driver disk rotates 360 degrees (or more) Driven disk should match the driver for 0-180 degrees. Driven disk should then rotate again from 0-...
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1answer
32 views

Accelerate and Decelerate linear Rotation

So I'm animating a 10 minute long clockwork sort of animation that has spinning gears all driven the rotation of a single object. There is a default speed and a faster speed I want them to rotate at. ...
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1answer
32 views

Script working on an object but not on another

I downloaded a blend file from another user here with a script (for drivers) and a mesh + armature. On the driver of said mesh it says Error:invalid Python expression. I couldn't get it to work for so ...
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1answer
15 views

is it possible that python .add_driver command cant create f-curve?

If I created a constraint on some bone, in pose mode - let's say Copy Location. And then manually created a driver on the influence (right mouse button > Add Driver), the f-curve with 2 points was ...
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28 views

How would I create a rotation speed controller

So I was trying to Create a Animated set of gears that play continuously through out a project. I have managed to do so using drivers a number of ways. (setting the frames or position of a moving ...
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19 views

Copy drivers from shapekeys

Basically i have one mesh (my character) and armature for that mesh full setup. A whole control rig and bunch of corrective shapekeys on my mesh which are driven by bones rotation (its daz3d mesh/...
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1answer
72 views

How Use the rotation of a driver object to drive the 0-1 position of 12 driven objects

I've specfied my question so its hopefully a bit clearer. The idea is to use the rotation of a driver, to drive 12 driven objects. This means that for every 30 degrees of rotation, a driven object ...
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23 views

Are the drivers slowing down the animation playback?

I recently removed the drivers of a rig to discuss a problem on this same website, and I was surprised to see my playback going from 2.5 fps to 12/13 fps. Are the drivers possibly responsible for ...
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1answer
49 views

How to attach an animation to an empty

i have some keyframes on my object , and i want to control that from an empty , so that when i move the empty forward i plays the forward animation. How can i do that. I know that i must use drivers , ...
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13 views

Offset animation for many objects using drivers

i have thousands of objects moving a path with the follow path constraint. i want every one of them to have the same animation but offset a couple frames. it seems to be impossible to get a value for ...
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22 views

Updated my drivers on my RX5700XT and now blender 1.83 crashes every time I render with cycles

So some of my games I was playing were messing up and it started to get annoying. So I updated my drivers on my GPU to 20.8.3 but now that I have those, blender refuses to render in cycles, it just ...
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23 views

180 degree bone rotation stutter problem - chained Action & Driver rotation

There are a number of posts referencing 180 degree stutter/flipping issues and resolving them by using a driver in-place of a modifier/constraint - which seems to work OK for a 1-to-1 relationship. ...
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111 views

Cycles rendering mode crashes the entire program AMD OpenCL

I never had this problem before, I recently came back to Blender and I'm doing the Donut series by Andrew Price, everything was working fine and I got midway but from one day to another, the entire ...
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16 views

Blender did not run and shows some error [duplicate]

When I tried to run the blender it shows this I don't know how to solve this as I am new to coding. Anybody help me with that??
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1answer
34 views

Driving emissives with mesh objests

Is there a way to achieve something similar with Blender? Specifically, I want to drive the lights with a 3d mesh. https://youtu.be/zRJ_HWQ7peE
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21 views

How to add a driver to an object dynamically using python

I want to add a driver to an object dynamically, containing the same information from the panel image I have the following code but it doesn't seem to work even though it doesn't generate errors <...
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1answer
29 views

Driver script not updating mesh

I have a driver script being called on an empty's position properties. When the user moves the empty, I'm regenerating a mesh based on the position of the empty. The driver script runs, but the mesh ...
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31 views

Get reference to the object holding the shapekey

So i have researched a lot but found nothing. When adding drivers you can "use self". I have come so far to understand that "self" is just a reference to the shapekey. But what i ...
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59 views

Force Updating Script-Created Shapekey Driver

I have written a small addon that takes a mesh with its shapekeys and adds a custom property per shapekey to a selected bone of an armature and connects the two with a driver, so that in the end, all ...
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98 views

How to delete drivers via python?

I want to delete all drivers on object in Blender 2.8. I am quite new to the scripting and the only code I have found is this: ...
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1answer
214 views

Faster way to create Drivers?

I've been using a lot of drivers. I'm pretty comfortable with them actually, but I wanted to know if there was a faster way to set them up than > right click > add driver > decide variable ...
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34 views

How to get evaluated driver value for certain frame?

I've already got an answer of how to get evaluated keyframed property value but this doesn't work for drivers in the same way. I've tried to get it with ...
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1answer
20 views

Problem Exporting Lattice Deform + B-Bones + Shape-Key Drivers

I am not too advanced in all this, and my problem has really stumped me. I have created a couple of characters from VeggieTales, using B-Bones, shape-keys, and Drivers to animate the mouth and a ...
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1answer
25 views

Blender 2.8: Best way to copy moves (rotations and translations) between 2 meshes

I have two meshes, « MasterCube » and « TargetCube » in different places. I would like to copy all moves (Translation X/Y/Z and Rotation X/Y/Z) from MasterCube to TargetCube in keeping the original ...
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1answer
37 views

How to check the pose bone have property which is driven?

I hope to check whether each pose bone transform values are driven or not by bpy.. At current I check it by bone name which rig vendor set (like sholder_drv), it work for the rig but I hope to know ...
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16 views

Driver to Texture Animation Playback Slowdown

My Animation playback speed in OpenGL 3D view (solid mode) dropped from well above 25 fps to 0.3 fps. As it turns out, the reason is a Driver added to a texture used on a huge number of objects. More ...
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14 views

How to set object visibility according to active camera suffix? [duplicate]

In my current project, a music video, I'm mixing 2D and 3D. The set is in 3D and the main character in Grease Pencil. I have 2 GP objects for the character, one when viewed from the front and another ...
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1answer
71 views

how to rig a car engine piston [duplicate]

i need some help setting up what is basically the same as a piston in a car engine's cylinder. i know i can just use keyframes and NLA strips but im after a more dynamic approach that wont require a ...
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48 views

Hi, Is there any way to know how many objects are referencing other object?

Example- I have a object named Master. Master object is used as a reference in many drivers and constraints(like master object rotation is used in some driver and it is also referenced in constraints ...
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17 views

Particle system velocity driver

I need to build a particle system which will be turned on and off with a property of another object (trigger). I have a cube with custom property "trigger" and a particle system with driver ...
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3answers
111 views

Blender make driver use local bone axis

I want to have a bone that drives another object's y location according to its(the bone's) local y axis. this is the driver I'm using. In this case the driver is working(The driver is what is making ...
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1answer
38 views

Can I use viewport modes as driver variable?

I am using an addon that replaces the default world in blender, however it's hindering the viewport performance in solid mode for about 20-30% fps drop. Is there a way I could make the driver that ...

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