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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.

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Carshing on start up: libGL error: No matching fbConfigs or visuals found libGL error: failed to load driver: swrast

I was using blender 2.79 without any problems for months, and then it suddenly starting to crash when I tried to open it. When I try to open blender from the command line the start up screen flashes ...
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24 views

Driver scripted expression problem

Hello fellow blenderers. In my recent work I try to create procedural football stadium using array modifiers. For that to work fluently I need to set up drivers and this is the point where problems ...
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Set Keyframes for Drivers

I'm trying to animate some Gears with Drivers. With the Expression '(bpy.context.scene.frame_current)/10' it works very well. The gears are rotating from begin to end of the frame range, but I would ...
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How can to link the colour of a point light to the RGB colour of another object in the same scene?

In my scene I would like to link the colour of the point light to be the same as the colour of another object, which is determined by the shader applied to that object. The output of that shader is ...
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18 views

Bone locations that control shape keys with drivers

I have a rather complex rig with 292 bones total. I am at a point now where I would like to work on shape keys to add detail to mesh deformations such as muscle contractions etc… The question I have ...
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How to set up shape key driver in 2.80?

So I have this character animation with a shape key that flattens and unflattens his hat: (in glorious technicolor here) It looks good. But the shape key is mucking up all my other Actions now. It ...
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Blender 2.8, Getting Script to Update a Driver

I have a for loop (A) that is updating a Custom Property (B) that is a driver for a Cube's X-location (C) which is supposed to update the Cube's location (D) and Export each incremental change to a ....
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Transform Animation from drivers to shape keys

I have a character head with shape keys for facial animation. I setup drivers to control the animation using circles. I need to make blender record that animation into the shape keys so I can Export ...
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sending Data or Values to linked Objects in Blender 2.80 / 2.81

I work a lot with linked data and library objects or linked collections. Is it possible to send values or variables between the different hierachical structures ? So for example: SCENEFILE (var = ...
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1answer
31 views

Delayed copy rotation…?

I'm trying to make a constraint or some kind of system in 2.80, where i have a vehicle, driving on a path (follow path constraint, also rotating, but only on z axis) and a third person camera, ...
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1answer
38 views

Can't try Blender 2.8 due graphic card and/or driver

this post may seem repetitive but among many with this kind of issue none of them can help me. I already updated both drivers (Intel and Radeon) and BIOS, installed Radeon ProRender + libraries and ...
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Keyframe to Copy One Property Value into Another

Is there a way to add a keyframe that will copy the x location from one object to a property on another object. It needs to be instantaneous, not continuous (like a copy location constraint). I want ...
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How to rig a BB-8 Model?

I want to make a rig for this BB-8 unit so that when it moves on X or Y axis it can rotate automatically even if it moves on both axis (on diagonal direction) most of tutrorials i saw works in case it ...
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Problems with driver setup

I will lay this question out as detailed as possible so hopefully I get the answer I am looking for. I have been reading a heap of related posts on this site and Wikipedia and other Blender related ...
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1answer
48 views

how to use a driver to drive object on object's local axis

I have a rig with face keys. i have a separate animation and i would like to use the animated data to drive the face keys. problem is when my object rig turns the axis changes relative to world axis....
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How to config Blender on Ubuntu 18 to use Amd-pro-gpu Driver instead of ROCM?

I run blender on ubuntu 18.04. After setting up the system and installing the AMD-pro-gpu driver for my VEGA FE from AMD' s official website, blender performed smoothly completing the BMW demo (gpu ...
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Relative rotation in drivers

I want to control an object C by a driver (based on a Python script) affecting the z-rotation depending on two other independent objects' (A & B) z-rotation. For example A rotates from 0 to 45°, ...
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How to get fist to clench in one bone

I want to get my armatures fist to clench to a certain point (1) and unclench (0) with one bone, similar to an IK but with less variety, I think it's called a driver. As in 1 is clenched fully and 0 ...
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Driver input as location in other object's transform space

I would like to have a driver input variable controlled as the location of some object in another object's transform space. Is there an easier way of doing this than having input variables for all of ...
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1answer
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Data path for driver: secret of 'node_tree.'

1) I prepared two objects for driving. 2) I copied the data path of the color property of diffuse shader in Suzanne's material node to drive the box. ...
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Blender 2.8 Add Driver refresh problem

I created a script (new object panel) I connected to custom property via Add_DRIVER manually. A custom property value incremented in all frames (via frame_change_post event) Another property connected ...
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1answer
48 views

Blender 2.8 keeps crashing after updating gpu drivers

I have a gtx 1660 ti everything worked fine, but when i updated the nvidia studio drivers to the 9/04/2019 release, and tried to check if the render times got better, but to my disappointment blender ...
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How do I make drivers depend on time?

I want to animate an engine and want to make the piston move on the z axis like a sine wave, with the frequency depending on the position of a plane on the x axis, like this: sin("location of the ...
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F-curve and driver, why is the value of the curve is not on the graph?

I just move from 2.79C to 2.8. Trying to make switch for FKIK on the leg & feet. Using driver for it, but the value wont move on the cruve like it should. I cant seem to rotate the curve like I ...
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Is it possible to use a list of keyframes to control multiple shape keys to animate a mouth?

I'm a 2D animator transitioning to 3D and my process so far has been to do lip sync in character animator (they've made things very easy to adjust keyframes for mouth shapes) then move that ...
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Blender 2.80: Driver of a value of a softbody simulation not visible in editor

To an object there is a softbody simulation. I added a driver to the "tension" value of it - the background of the value field changed color as it should be. Then I "open in driver editor" and no ...
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Blender 2.80: Getting min() / max() right in an expression for a driver

If the scripted expression of my driver uses "min( var, 1.0 )", and "(x) var" is set and the y-position of an armatures bone is used as data source, everything works as expected: The drivers value ...
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Rotation Driven by Position - Driver Issue When Rendering

My latest rig in Blender 2.8 contains a ball that is supposed to roll on the floor. I already got it working in the viewport, but only until I hit the Render Button. When rendering, Blender completely ...
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Sensing the direction of a movement (instead of its absolute position)

Context is a steampunky machinery with a lot of mechanics...some somehow "defective" and loose... ;) There is a piston in a cylinder. Due to some "failure" (animated intention) the piston moves along ...
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1answer
47 views

How do I get the position of an object from a previous frame? Not the current frame

empty's are ignored when rendering in eevee (but not in sound engine) I made a some drivers with empties to determine the speed and acceleration of the object, but when rendering, the behavior of the ...
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Stereoscopic Video - Using Backgroundimage for each Eye?

I try to create a stereoscopic video with 3d Background. The Background Image can be a stereoscopic (side-by-side) or two different jpg's. I've experimented with Material and Drivers. My Idea was, to ...
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How do i control a driver using an RGB node?

Lets say i got a node and i want to change the color of that node with another node using drivers something like this, so if i have my RGB node color set to white, it changes the Diffuse node to ...
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28 views

Define object thickness with curve

I'm modeling a heart-shaped cookie cutter, and I'd like its cross section to be thicker near the top and come close to a point at the bottom. The heart is a Bezier curve with a mirror modifier, ...
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48 views

Installing NVIDIA's 2Gb cuda_10.1.168_425.25_windows.exe new driver breaks Blender CUDA availability?

Blender has always been able to use the CUDA features of my NVIDIA graphics card GTX 780M 3Gb (Win 8.1 64bit) very sucessfully. Revently downloaded NVIDIA's 2Gb cuda_10.1.168_425.25_windows.exe file, ...
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Accelerating a looped animation over time

I've got a looping animation set up for a ground plane so it looks like there's motion (kind of like a repeating conveyor belt), but I'd like to make it accelerate linearly over time. Here's a preview ...
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20 views

Constrain Minimum Z location on object A based on x Rotation of object B

I have an object A that is constrained to only move up and down the Z axis. I want the minimum Z transform value to stop when the rotation of object B is 90 degrees. Object B points to the origin of ...
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2answers
151 views

Keeping rotation values within a range of 0 to 360°

How can I keep the rotation values within a range of 0 to 360° no matter how many times I actually rotated an object? I need this as a value for a driver variable. For example 945° => 225°.
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15 views

How to tell a driver “to do nothing” within a condition?

let's say I have two cubes (#1, #2), the z-axis-rotation of #1 controls the z-axis-rotation of #2 by a driver but only if it is <180°, else the rotation of #2 should just stop. How can this be done?...
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Driver variables not updating using custom functions

I'm making an addon (in Blender 2.8 final release), in which I have a custom function on a driver and I want that function to change the value of some properties of different objects (like their ...
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2answers
42 views

2D Animated Face, Is posible to drive the x-uv offset on Blender

So I wanted for a lot of time to do a model with an animated texture by face for a game and I stumbled with this video: 2D Eyes Maya to UE4 On it, they achieved the thing I'm searching for in Maya, ...
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1answer
84 views

Keep Scene resolutions in sync

Different Scenes can have different resolutions. But a lot of the time, you'll always want them to be the same. Its a big hassle to have to update several other scenes all the time, especially while ...
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2answers
143 views

Is it possible to access an array in a custom property in a driver?

In a new project I've add a custom property to the default cube: bpy.data.objects["Cube"]["positions"] = [4,3,2,1] Is it possible to access this array from a ...
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51 views

ShapeKey Slider Driver Addon? Anyone Still Have It For 2.79?

The author of the shapekeyslider driver addon accidentally removed it from blendswap and doesn't have a backup of the file. I've been looking to get it again after a computer crash. Do any of you have ...
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1answer
88 views

Scaling faces with drivers

I'm starting to play with drivers but I can't do a simple thing. I created a driver to scale the faces of a cube, connected to the distance of an empty. The problem is that when the empty is near all ...
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Can a Driver be set on the the Disable in Render button

If I set up keyframes on the enable\disable in render, or the enable / disable visibility in viewport. Is it possible to set a driver, that will copy the keyframes from one setting to the other. Or ...
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1answer
190 views

Building a Shader Switch | How to get custom values from individual objects?

I'm trying to build a shader-switch to easily switch the texture out of a set of ten different images. I want to use a single material for a set of picture frames. This is what I've got so far: The ...
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1answer
60 views

Blender crashes on startup, why?

Trying to use blender on ubuntu 18.04 and I get the following error: libGL error: No matching fbConfigs or visuals found libGL error: failed to load driver: swrast ...
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0answers
27 views

Object with driver issue when rotating around Z- and X-axis

My object (a mechanical arm) is Clamped To a curve. I am using a driver to move this mechanical arm around the curve. When rotating this curve around the z-axis or x-axis, the entire arm starts ...
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Are drivable outliner options not a thing anymore in 2.8?

Ive been working on a rig for the past weeks now and i just met with this drivers problem, i found out that in 2.8 you are not allowed to create drivers for enabling or disabling restrict selection ...