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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2
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1answer
15 views

How to get the name of the property that has a bad driver in Python?

I’d like to write a script that will tell me which drivers in a scene have problems. For example, the driver that I’ve highlighted in yellow has problems: I want to return a list of every driver that ...
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31 views

How to achieve dynamic lightning for day/night earth planet

I cant get dynamic lightning. I have used drivers to set up this, however, once I add the night texture it still shows on parts that I have lights. Here is my node setup: I have been following ...
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1answer
33 views

How to drive camera's Y location with same camera's Focal Length

This isn't for an animation, so I'm not inserting keyframes - as I view the model through the virtual camera, I want to experiment with different focal length values in Eevee and Cycles; but to not ...
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0answers
16 views

Drivers only working for Z rotation on some objects within scene

I'm having a problem rendering a scene with multiple icospheres animated using drivers. I'm using X and Y drivers to move the objects along an ellipse (closed) path. And I'm using Euler Z rotation to ...
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49 views

“Use self” doesn't work?

I'm currently working with drivers in Blender 2.81 and want to use self but it doesn't work. For example drive the rotation by the location, I'm adding a driver ...
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18 views

How to add shape key driver in 8.1

This topic keeps getting more challenging. I have made a shape key where I moved some vertices in a model so the character goes from frowning to raising his brow. I also created a new bone in an ...
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1answer
58 views

rotation driver - skipping backwards after 90 degrees

I know this is a radians/degrees issue, but I'm not sure how to solve it I have two objects (needles in a gauge) that one should rotate at 10% of the other - it's an altimeter for an airplane model ...
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1answer
15 views

get coordinates of bone from the perspective of second bone in driver

I'd like to get the coordinates of one bone from the perspective of an other bone, i.e. figure out the x,y,z coordinates of bone A where the axis of the space is aligned with the rotation and location ...
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17 views

Equivatlent to 3dsMax’s “Expose Transform”?

Is there any possible way to get access to an object's rotation, in its parent's space, to use in a driver when it is being driven by a constraint like "Track To"? In 3dsMax I would have been able to ...
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1answer
27 views

Modal Operator Not Updating Driver(s)?

I've been creating an add-on for Blender but discovered a problem. For my add-on, I need to be able to get drivers to update in realtime while a Modal Operator is running. Since the add-on code is ...
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1answer
27 views

Unable to Drive Animation from Timeline using Scripted Expression Driver

I'm following this tutorial: https://www.youtube.com/watch?v=sfn1MJ3X-dg&list=PLbjn7kaP877u1sX4zl081V8jUeSHDY18G&index=6 And halfway through he shows an example of how to drive the y-rotation ...
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2.79 FK to IK Rig and Drivers, Why are they Conflicting?

blender 2.79 i'm not real versed in this, but i was following this tutorial: https://www.youtube.com/watch?v=r-G3ocQ5cjg basically, the pose bones follow the ik chain bones when the ik switch is on. ...
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25 views

How to make driver for slide menu like direction in {X, Y, Z, RGB TO XYZ} in Displacement modifiers and control it by custom properties

How to make driver for slide menu like direction in {X, Y, Z, RGB TO XYZ} in Displacement modifiers and control it by custom properties The menu has 6 options: X, Y, Z, Normal, Custom Normal, RGB TO ...
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26 views

Has anyone managed to GPU cycles render with HD7770 in Debian or another disro?

HD7770 is mid-Range, southern island, Cape Verde XT, GCN 1. It is an old card according to Blender thus not eligible for GPU cycles rendering. Specific instructions are needed to get this working not ...
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9 views

is there a way to enable disable collections with driver or script?

Is there any script that does this? i cant place drivers on a collection so i thought a script would do the job... not necessarily a driver adding one but something i can control with a property value ...
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26 views

How to drive multiple shape keys based on relative camera position?

My question is basically an extension of one asked last year: Drive shape key based on relative camera orientation? They received some great answers but the solutions seem to be only for one shape ...
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105 views

Opengl 3.3 drivers blender 2.81

I use blender 2.81 at start, I get this error, the drivers are updated through the driver pack solution. Some may say that the graphics card is not suitable and needs to be updated. But if I use ...
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32 views

Calculating position difference in a driver

Suppose I have an object, that I move from A to B (by pressing the G button) on the XY plane. I want to automatically orient it, so it always faces the direction of the movement. Furthermore, I want ...
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37 views

How to export shape keys as fbx when they are controlled by drivers?

Good afternoon, I have an animation set up in Blender where I have bones controlling the shape keys of my object. The shape keys have drivers, so when my bones move, the shape keys activate. However, ...
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1answer
21 views

How do you convert an expression that works in the console into a format a driver can make use of?

I'm trying to convert the following expression for use in a driver expression: 1 if ( bpy.context.scene.frame_current == bpy.context.scene.frame_end ) else 0 So ...
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1answer
25 views

Access material node drivers from python

I would like to store my whole node input driver set up of a material in a txt file and load it back any time. How can I access the driver data along with node name and input number?
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1answer
30 views

How to connect shape key animation as driver to rotate a bone in pose mode

I am attempting to utilize facecap (iphone app) face fbx file (it has 51 shape keys with animation data on it etc) on a character with rigify rig (face as well). Question. i want jaw rotation (jaw ...
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1answer
25 views

How to add drivers in node inputs in python?

I am trying to add a driver in a node entry in the World. The following script fail with "TypeError: bpy_struct.driver_add(): property "inputs" not animatable " I can't find sample of similar code. ...
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1answer
28 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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24 views

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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19 views

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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27 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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1answer
48 views

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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35 views

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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26 views

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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92 views

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
45 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
52 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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9 views

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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0answers
23 views

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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14 views

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 ...
2
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1answer
75 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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0answers
59 views

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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0answers
25 views

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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0answers
14 views

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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17 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 ...
2
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1answer
124 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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105 views

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
77 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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0answers
37 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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0answers
7 views

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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0answers
29 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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7 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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0answers
27 views

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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