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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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Using a curve's calc_length() method in a driver expression?

Recently I've dipped my toes into Blender's drivers & expression system. I'm trying to scale a road to exactly fit the length of the curve it's following. I came across this post of two years ...
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13 views

Is it possible to create a driver that is controlled by a marker?

Imagine I'm using SHOT_01 marker for camera 01 and SHOT_02 marker for camera 02 view, and I want to have Object A visible only during SHOT_01 and Object_B visible only SHOT_02 Is there a way to do ...
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9 views

How to set the F-curve that defines the bone’s Y position to a reasonable range

I'm trying to drive the control bones of the armature through the shapekeys using the method explained here,that's basically something like this : Add a driver to the bone’s rotation in Pose Mode (...
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13 views

rotating a rotor-wing by driver

I got a rotorwings (drone) that i would like to drive by a driver (distance to base-empty). the drone itself can rotate over any axis, but i like its rotors to be driven by the distance to base-empty....
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7 views

Proxy targets get messed up with custom properties

I'm not sure if this is a bug or that I am doing something wrong. Let me sketch the situation. In a library file I have an object with a custom property driving shape keys. When I link the cube in my ...
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1answer
28 views

How to have skeleton/armature change with shape keys?

I want to have it so when I change the value of a shapekey, it also moves a bone according to the value. So for example, when I change my character meshes eye width or height, the eye bones move with ...
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19 views

Is there an equivalent of After Effect's “valueAtTime()” for drivers?

In After Effects you are allowed to use Expressions very similar to blender's drivers. In a very simple fashion you can get a property's value based on a given time like so: ...
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16 views

Driver not updating when rendering animation

Have you ever experienced such an issue? Driver not updating when rendering animation, but updating when single images are being rendered one by one? Case description: I created empty, linked to a ...
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1answer
33 views

Rigging a Wheel to Turn Corners: Drivers vs. Bones

The tutorials I've found show how to rig a wheel to roll automatically, in one direction (X or Y), in relation to the location of an empty or bone. I've managed to get the wheel rotation to work along ...
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5 views

How do I make a driven bone cause its keyframe value to change?

So I developed a method to export a face key animations via BVH. Below is a character that has a row of bones over its head. They contain facial animation data, one bone per shape key. So all I ...
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4answers
152 views

Drive shape key based on relative camera orientation?

Let's say (for the sake of simplicity) that this cube with two blue sides is my character... and the shape key in question raises a few vertices on top. Whenever the camera views either Blue side, I'...
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1answer
54 views

How to drive shape keys based on the angle between two bones?

My character rig needs shape key correctives when it makes certain poses (eg. lifting the arms, the shoulders need to be corrected with a shape key so they don't lose volume). I know you use a driver ...
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10 views

How do I make a driver bone that adds value to a driver then resets to its original position?

A bone in its starting position, if you grab it and move it up it adds value to a driver, if you move down it subtracts value to a driver but once you stop dragging it and drop it, the bone ...
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1answer
28 views

Weird driver behavior on frame change

I came across some weird driver behavior and hope someone can explain this to me. I was trying to create a wheel that rotates automatically on the floor when it is moved along. (Just like real world ...
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1answer
26 views

Blender eats space on C drive

Yesterday I've had 2GB of free space on C and only after using Blender it has all gone. Can anyone help me?
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13 views

How can I insert “blend_filename” into the output node?

One thing I often do is rendering via CLI, and I like to choose EXR format to have 32bit files ready for archive. I also like to have blender saving the jpg preview to quickly see it in OS filebrowser....
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Question Using Drivers, Control the driver at specific frame to either turn off or minimize effect

I am using a driver in blender that controls a ShapeKey (ponytail moves up) I am assigning that driver to act on the spine bone in the head. so if the head looks up, the ponytail wont clip into the ...
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1answer
17 views

Select or find everything that a driver is driving?

How can I find out all properties that a driver is driving without manually checking every object in the graph editor?
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11 views

Scaling problems (using drivers or hooks)

I want to do a wooden construction within Blender 2.79. The width of the beams shall be variable (for example using a driver) but identical for all beams. My problem is that the position of the beams ...
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100 views

Why is Blender 2.78c/2.79/2.79b CUDA Rendering option not available with Nvidia GTX780Ti on Windows 8.1 OS?

Does anyone know why Blender will not show CUDA option for rendering in Blender if I use Nvidia driver later than Driver Version 388.71 released on December 20th 2017? The CUDA Compute Rating is: ...
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0answers
17 views

Entire blender is greyed out/highlighted.. or something

I haven't been in blender for over a month now and when I started it up fo the first time in a while, the whole thing is like white/grey: I get the feeling that it might be because my computer needs ...
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1answer
58 views

Problem with Material drivers for nodes properties

I'm following these instructions https://blender.stackexchange.com/a/75652 (paragraph "Setting drivers"), and also the video linked here https://blender.stackexchange.com/a/5384 video: https://vimeo....
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1answer
137 views

Rotation Value ist not the same as given in the driver output

I am just trying to set up a dynamic circular array of objects. To keep it as dynamic as possible, I want to make my helpers empty z rotation driven by a driver. The Scripted Expression looks like ...
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28 views

Rolling ball rig (drivers output the incorrect results)

I'm trying to make rolling sphere rig for my BB8 droid. I did it with drivers and with animation nodes too, but when the sphere moves on both axis it starts to rotate incorrectly. I even tried to do ...
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4answers
332 views

how to use the slider of the shapekey value for moving the shapekey and the bone connected to it

I'm trying to connect the shapekeys that comes from the manuel bastioni lab to the bones that come from rigify. Infact I’ve used two armatures to get the best from both these rigging systems and I ...
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1answer
51 views

Driver constraint addon error when it is applied : property has not been found

I used the driver constraint addon to connect the shapekeys to the bones. The shapekeys come from the manuel bastioni lab and the bones from rigify. I've used two armatures and I have connected them ...
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49 views

Maintain equal rotation on multiple objects

I am making a model with gears. I want to be able to turn any gear and have the others fallow. Using constraints or drives only one gear will rotate (and the other will fallow). Is there anything I ...
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1answer
32 views

How to drive a value with linear fcurve on both positive and negative axis?

Like for example: I have a constraint on object A, B is driving the constraint influence. If I move B in +X axis 0 to 1, the influence on A is going 1 to 0 on a linear fcurve. I want to ...
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2answers
70 views

Is there any driver expression for elif statement?

Is there any way to add if elif and else in drivers? Given the way we do if and else, here ...
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0answers
15 views

Link mapping node rotation to another objects rotation?

Let's see if I can explain this. I am trying to answer this question but lead me to a question of my own. I am using this answer from Rich and I am trying to expand on it. I have a point light (...
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0answers
26 views

Reset Curve in Drivers Graph Editor

I have a question about the curve displaying in the Drivers Graph Editor. This curve change according to the modifiers and variables I choose in the N menu, but I can also change it manually (add ...
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1answer
40 views

Is my performance affected by invisible items?

I am making a video and I am planning to have a particle emitter to shoot lasers from my spaceship. My theory is to somehow keep it going endlessly, but control its invisibility somehow, perhaps with ...
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0answers
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Controlling emission strength with bone driver?

I have a rigged model where some bones which are constrained to a certain y location length. I would like to control an emission strength with these bones if possible. I've added drivers to emission ...
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1answer
24 views

Wheels wont rotate in animation but do in edit mode? [closed]

Situation, i made a wheel, and a empty-cube. The weel's parent is the empty-cube. Next for the wheel i created a simple driver. Based upon the empty cube y-axis movement : When i am in edit mode and ...
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2answers
44 views

Camera follow object and then stop in place

I would like the camera to follow an object. At frame 300 the camera should freeze at its current position and stop following. I tried using Copy Location constraint (with offset) on the camera. At ...
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0answers
23 views

Creating a driver for a tank on a circular path

I've created a driver for a tank tread using this tutorial: https://www.youtube.com/watch?v=LovMyPoW6Ko The driver being used is rotation X of my wheel is determined by the global Y transform of an ...
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2answers
35 views

adding a delay for a driver

I have a driver on a keyshape which is controlled by an object moving in the scene. I would like to add a 5 frame delay so the keyshape changes are delayed by X frames. I am using scripted expression ...
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Using driver for Speed Control effect

I have added a driver for the speed control effect on my sequence of frames. I want the rendered video to move sinusoidally back and forth through my frames. My driver seems to be working properly ...
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49 views

Materials Drivers not updating on viewport?

I want to do 2D eyes that the mapping is being controlled by a bone, for this I'm using a driver The problem is, the driver works but only on render view and not on material view As you can see the ...
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74 views

Geforce 397.31 and multiple GPUs Support

After installing the Geforce 397.31 driver I notice when I gpu render that only one chunk rendering, but when I check in blender user preferences my two Gtx780 are selected. I also notice that I can't ...
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8 views

Channel color coding for bones

I have two location (XYZ) drivers set up for two bones, oriented the same way (ie bone axes the same direction on each), all drivers working perfectly. In the graph editor, the channel colors are ...
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0answers
21 views

Delayed driver for targeting purposes

Recently I posted a question related to adding progressive changes to a driver output value once per action of the user, directly on the viewport and independently of the fps of the scene. Fortunately ...
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1answer
48 views

While loop Drivers and additive movement

Im working on a little project that uses drivers... I have used them extensively but Im failing to find a solution for this problem. In this project I wont use scripts. Also, this is not on BGE, but ...
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22 views

Ping-pong (back and force) alembic animation

Is it possible to play forward-backward (so call ping-pong) the alembic cache? I read this topic and I understand there can be used scipted expressions as drivers. But I can't imagine the math ...
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0answers
21 views

Is there a way to put a driver on Emission Count in a Hair Particle system?

I am working on a way to populate random details along a single edge (like windows doors, garage doors, ..etc), in an attempt to create semi procedural buildings. So far I have found that using a hair ...
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1answer
71 views

How to use a negative driver value when scaling?

I am working on 2d project and need to scale a plane using driver with a scale variable ,but when the value of driving transform channel is -1 the driver value is still positive and equal 1 . It seems ...
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39 views

Head and neck rig

I am creating a neck rig similar to Sintel Lite, but with less bones. Specifically, the hinge and extent properties found on the head and neck controllers. The issue is I can't get it to work right. ...
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1answer
39 views

broken script to bake keyframes from driver controlled shape keys

I found a script on the web that is supposed to set key frames for driver driven shape keys. however its giving me an error. I need this so i can remove the drivers for the render farm I use wont ...
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1answer
42 views

How do I match the range of a distance driver to the value range of a key shape?

I have a key shape of SUSPENSION going from fully squashed to fully stretched. The key shape is for the suspension of this vehicle rig. The key shape is 100% weighted to an IK bone. I've ...
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1answer
377 views

Establish a variable inside a driver expression

I'm quite new to python and drivers. I'm writing a rather complicated scripted expression inside the driver-area and I need to repeatedly use a long number sequence. Would it be possible to first ...