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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7 views

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
25 views

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
22 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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15 views

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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21 views

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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6 views

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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10 views

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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15 views

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
40 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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20 views

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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23 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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27 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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24 views

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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19 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
142 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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14 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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24 views

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
18 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
77 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
76 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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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
87 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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11 views

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
121 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
23 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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25 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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14 views

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 ...
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Shape key drivers seem to break (red line under drivers) when i select my character mesh and enter edit mode

Just discovered the cause of this "issue" but I'm going to post anyway in case anyone else has run into it and also worried it had corrupted their files. My issue is: I'm in the Action Editor, and ...
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8 views

Error message while I trying to rename custom properties

Blender is giving me this error message while I try to rename custom properties.
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14 views

Problem with bone disconnecting during animation

I have difficulty articulating my thought, so please be patient with me. I am having issue of child bone disconnecting from parent bone eventhough they are "connected" during animation/posing (ref ...
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1answer
38 views

Boid Particles - How To Use Fighting/Battle Information In Animation (Fighting Ants)

I am experimenting with boid particles and I have set up an ant fight simulation, where there are two enemy boid systems emitted from different areas (vertex groups) of a plane. "Allow Land" is ...
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1answer
62 views

Blender 2.8 drivers, trigonometric functions not working?

I am trying to make an object rotate based on its position. Basically the Y-angle gamma = arcsin(var) where var is the driver variable connected to the x-location of the object. The only problem ...
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40 views

Blender not running with software opengl

I'm trying to run blender(2.80) from windows 2016 server with 2x nvidia tesla v100 and a matrox g200he3(?). When I try to run it(in RDP and VNC), I get the opengl version higher than 3.3 message. I ...
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20 views

How can i get the Driver Value? (which is displayed in Debug info)

Hellow, Please tell me how to get the value of the driver, which is displayed in Debug info. blender 2.79. F-Curve.evaluate(frame) - this value after all modifications, and I need what is in this case ...
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14 views

IK leg acts as FK when Torso is transformed on the z axis

I found the following rig the Blend file on sketchfab and tweaked while following DanPro advanced rigging tutorials. Then I noted that I have a strange issue with the rig, and I'm curious as for ...
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2answers
48 views

Adding a random offset to drivers

So I want to animate multiple "cables" (witch are curves), i want to animate the bevel start (or end) and add a random offset to this value. I could put some keyframes and offset them manually but i ...
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52 views

How do you make a seamless IK > FK > IK switch using drivers?

Is there a way to have a seamless IK, to FK, to IK, to FK, etc... kind of slider? I have seen it to be done in riggify but it uses a python script that only works with that armature and doesnt look ...
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1answer
530 views

Blender 2.8 Viewport object visibility problem

I have this annoying problem to which I can't seem to find a solution Is there a way to enable in viewport to display rendered only objects, check out image below to see what I mean. In 2.79 it was ...
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35 views

One shared material with different custom property for each object

I'm trying to procedurally generate a scene with several objects (cubes for now!) sharing a single material, but appearing and fading out at different times. So far, I have been able to place the ...
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24 views

Blender 2.80 crashing when I try to open it?

I have installed blender 2.79 before but when I try download Blender 2.80, unzip and try to open it it's just closes like crash without say anything or any error. When I tried to uninstall the last ...
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1answer
34 views

Linearly Scale Light Temperature

I want to have a plane which goes from temperature x to temperature y with respect to one of its sides. I was looking into drivers but this doesn't seem to accommodate geometry, only scale and ...
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13 views

Bake Dolly Camera Rig Add-on animation for sheepit rendering

I'm trying to bake camera drivers using Object/Animation/Bake Action/Object and then the Dolly Rig using Pose/Animation/Bake Action/Pose But when I reload the file without the 'Auto Run Python ...
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1answer
381 views

I can't seem to select any vertices edges or faces in edit mode, blender 2.8, Mac OS 10.12.5

I'm trying all three point/edge/face contexts and using the select tools, yet nothing is selecting. I can't do any modeling! I've read a few other posts pointing to graphics drivers, but I have the ...
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1answer
25 views

Custom float property used in a driver need manual UI modification to work

I'm currently creating some script to automate a cloth rig setup. In the process I'm adding a custom float property to an empty and use it in a driver. It's a concept I wish to reuse for other ...
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please help me with the drivers

help me with the drivers please i am trying to make the wheel rotate always forward using drivers but when i change the Direction of the variable (cube ) , the wheel start to rotate in the negative ...