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.

Filter by
Sorted by
Tagged with
0
votes
1answer
16 views

How to run Blender on the discontinued Intel 4 Series Express Chipset Family?

is there any way to run Blender on the discontinued Intel 4 Series Express Chipset Family or will I have to fin
1
vote
1answer
17 views

Add Range to Driver Expression

I'm trying to set up a driver for an object that uses an integer property from a panel in a custom addon as its data path, to basically control the visibility of the object within a range. So for ...
0
votes
1answer
22 views

Tank Rig Driver Help

creating a very simple tank rig with a driver controlling the movements of the tracks. now I got the tracks to move forward but when rotating the control on the Z axis, the tracks don't don't move. ...
0
votes
0answers
20 views

Need Repeat Driver Properties with Python Script

I'm trying to Copy Targets to multiple Drivers without me having to manually put them in every driver property. I basically just copied over the Data from the info panel and tried to run it in python ...
0
votes
1answer
23 views

how could i compile and update dependencies automatically?

I find this custom driver on templates / python / driver_functions and I did it run. But I realize that always I close and reopen the file, it need to be compiled and updated in the driver. I try this ...
0
votes
0answers
17 views

Creating an accurate spinning wheel using drivers on Blender 2.83

I know that this has been one of those things thats been around for a while, so im sorry if this is repetition of older discussions. I understand the math behind the calculation of the rotation of a ...
0
votes
0answers
13 views

Update dependencies of driver variables

First post here trying to determine how to solve a problem related to a driver not updating. I know there are other answers here regarding such a need (e.g. one indicating that ...
1
vote
0answers
17 views

Can Driver Scripted Expressions access Node Group Inputs?

I have a Material that consists of a single Node Group; one of the Node Group inputs is a scalar value named Spot Z Rot. I'd like to add a driver to the Z rotation of an object, forcing it to match ...
0
votes
0answers
14 views

Driver freaks out and turn on and off

My driver turns on and off when the bone is controlled by gets moved by another bone. https://gyazo.com/db6489de950cb4b7e36297ac8842d038 What could cause this?
1
vote
0answers
33 views

Parallel horizontal slide of legs according to angle tilt of cylinder

I got stuck on this challenge to get the legs (armature 001 - 003) slide on the floor when tilting the cylinder as they almost do right in my example. They need to stay parallel to the cylinder. This ...
0
votes
0answers
8 views

Check if node socket's default value is animated

I want to detect, from Python, whether the default value of a given node socket is animated. This includes keyframes/F-curves, but also drivers - anything that could change the value over time (except ...
1
vote
0answers
15 views

How can I use the 'Copy as driver' and 'Paste driver' functionality in Python?

I'm writing an addon for Blender 2.8. I have an object and want to drive the Y & Z Scale with the X Scale. Doing it manually with right click on the Scale shows me these commands: ...
1
vote
1answer
33 views

Drive the value of a Follow Path constraint

I have a project where I would like to use a bones rotation value to move another bone along a brzier curve. I have a bezier curve with the bone that is constrained to the curve with a "follow path "...
0
votes
0answers
15 views

Distance driver not working in the rig to switch images (2.5D animation)

Working on a 2.5D character rig set up for an animation production. We move the controller up and down axis to switch between different shapes. We are using a distance driver in the blender rig to ...
3
votes
1answer
26 views

Workspace custom property doesn't work as driver's variable

I've tried to use a workspace's Custom Property as a variable for a Driver, but it looks like the path to the Custom Property is broken. Is there anything that needs to be added to the properties path?...
1
vote
2answers
65 views

driver expression dot.product function

I´m coming from 3ds max and I would like to rebuild a scene in blender. It has a controller that outputs the angle between a bone and the world z-axis via the dot product function. That´s pretty ...
0
votes
0answers
20 views

How to Drive an animation with an object

Hi I have an animated Bezier curve that is not shape keyed but the control points are individually animated. I have a bezier circle that I have in the file that I would like to drive the animation. ...
1
vote
0answers
25 views

Drivers seem to only use radians

Simple driver: 15+(15*(sin(frame))) Should return between 0 and 30 but forces 180 most of the time. I've tried both: 15+(15*(sin(degrees(frame)))) 15+(15*(degrees(sin(frame)))) Neither work and ...
0
votes
2answers
39 views

how to get driver value

how can I get the value of this value as in printable form.
0
votes
0answers
32 views

driver expression scripts doesn't work for render

I set driver script on the bones named“arm01.R”and others for arm’s motion. It works fine at view port. But on render it does not work. I checked “Auto Run Python Script” on preference settings. What’...
0
votes
1answer
14 views

How to Avoid/Correct Circular Dependencies on IK Rigs with Drivers?

In reference to this report on mis-behaving IK rigs-- https://developer.blender.org/T76158 The answer is, IK rigs with dependency cycles have undefined (glitchy) behavior. My follow up questions are: ...
0
votes
2answers
48 views

How can I apply the Shape Key Driver to the Pose mode?

I made a Shape Key to fix the jaw. I have tested it by moving the F-Curve and I can see it change when the value passed 1. And when I go to pose mode and change the jaw bone and come back to the ...
0
votes
1answer
25 views

Customizing the Rigify meta-rig, Constraints & Custom Drivers, what's the solution?

basically as the title says I am interested in two things: How do I add constraints (Copy Rotation, TrackTo, etc.) to bones in the metarig, and then have them created/applied to/copied to the ...
0
votes
1answer
55 views

How to make eyelids react with eye movement?

How do you make eyelids react with a character's eye movements? For example, if the character looks up, the upper eyelid rotates up, but if the eye looks down, the upper eyelid doesn't rotate down ...
1
vote
0answers
10 views

Can we use both drivers and physics properties at the same time

Today I tried to make an animation of coin that rotates on the z axis placed perpendicular to the plane, When I applied rigid body constraint (active) to coin and rigid body constraint (passive) to ...
0
votes
0answers
22 views

Python: How do I make a script that creates a driver for a shape key from a bone from a bone rig?

I never made a script for Blender that worked but I have tweaked an existing script with success, but I have not found a script that I can modify that creates a driver of a bone in a rig that controls ...
2
votes
0answers
20 views

RGB from HSV values driver extract

I'd like to use drivers in Eevee for color change of two objects. One is a mesh and second one is a light. I have an empty with custom properties with 3 values (HSV) created, and material which i can ...
0
votes
1answer
25 views

How to rotate multiple (controller) bones with one main (controller) bone?

I got a quick question regarding rigging in Blender! So i recently picked up Blender to teach myself some of the basics things (modelling/rigging/etc), i have worked in Maya for many years prior. But ...
0
votes
3answers
48 views

how can I position an object at a moving bonehead?

I would like to draw a steam locomotive with rotating wheels, driven by a horizontal rod. Cannot find an Object Constraint to couple an empty to the head of a rotating bone. The base of a second ...
1
vote
1answer
33 views

Driver action animates in viewport but not in Eevee or Cycles

A Python driver I created to make a wheel turn works fine in the viewport but not in Eevee or Cycles. I then created a new file with a simple driver using only the on-board driver facility. That ...
1
vote
1answer
24 views

My rotation driver variable loses a value greater than 180 degrees

I am trying to use the axis of rotation of a bone in a driver variable. By the way, there is a problem when the rotation value is greater than 180 degrees. For example, the transform displays -207, ...
0
votes
0answers
25 views

Shoulder rigging, collar bone not following bicep bone

I am new to rigging, wanted to rig a model myself with IK etc, so that I can pose it and so on. There is a tutorial I tried to follow but it just does not work like the guy is explaining. Basically I ...
0
votes
0answers
9 views

Driving rotation with expression based off position causes dependency cycle?

I have a plane hooked to two empties, so I can move the sides around by moving the empties: But I want the plane to always be a rectangle; all the angles should be 90 degree angles. I set up drivers ...
0
votes
0answers
54 views

How to get transform delta values when moving an object

When I move an object the transform delta values (Dx, Dy, Dz) are displayed in the top left of the 3d context window. Can those values be captured for use in scripted driver functions? edit: It is the ...
0
votes
1answer
29 views

How can i get the change in value of an objects rotation between the current and previous frame, and use it in a driver

I want to use the change in rotation between the current and previous frames to rotate another object. EG object A was at 30 degrees in Z axis last frame, and is now at 35 degrees in Z axis on the ...
0
votes
0answers
35 views

How to symmetrize bone drivers

Hello. I am working with drivers on the bone’s transform channel. It usually works well, but I still haven’t found a symmetry feature for the driver. I’m bored of repeating resetting the driver on the ...
0
votes
0answers
14 views

Constrainted objects displaced during rendering animation

Faced the following problem. When I've rendered an animation, some details were not where they should be according to the timeframe. This problem occurs only when rendering an animation (3 problematic ...
0
votes
0answers
26 views

Using driver to drive bone transforms with the same matrix calculation

So I have a driver that does matrix calculations to calculate the desired transform of a bone. To apply this transform on the bone, I add a separate driver for the location, rotation and scale ...
0
votes
1answer
76 views

Wheel Rotation Driver

Hi everyone I'm still a beginner at blender and I'm trying to make a simple wheel rotation using empty and drivers, the wheel rotates fine when I move the empty on local Y-axis but the problem is when ...
0
votes
0answers
12 views

Drive a value based on if a bone is selected

I want to drive a property value based on if I a bone is selected. I added data path of the bone's select property data.bones["Bone"].select like seen in the image. ...
0
votes
0answers
8 views

Is it possible to influence an animation with a driver/property/sth?

Imagine we have an animation that scales a cube from 1m to 2m. Now I want to influence the 2m with a driver or property or sth else. So when i set the value in the property to 3m the animation scales ...
3
votes
1answer
68 views

How can I control node values without input inside a group node?

I have created the node group, but I can't control the values inside.
0
votes
1answer
27 views

New Linux system for Blender

I have just received my new Linux computer, I am coming from MAC background and I am having a few problems. I have a AMD 3970X with Nvidia 2080Ti with 64Gbs Ram but my system lags and Blender crashes....
1
vote
1answer
30 views

Transform a Location “Constrained” Object?

What I’m overall attempting to do here is be able to move an arrayed object with an empty which will always rest at the center of the array of objects. If the count in that object’s array is raised or ...
4
votes
1answer
114 views

Rigging delta arms

I am currently trying my hand at rigging a virtual delta 3D printer in Blender. In it, the position of the central sphere (the printer's "nozzle") should be determined by the z-position of the three ...
1
vote
0answers
18 views

How to STOP dependencies updates when editing drivers via python?

I' swapping a bunch of drivers in shape keys via python in Blender 2.8x, but I'm not liking the performance because it keeps causing dependencies updates at inconvenient moments. At some point of the ...
1
vote
2answers
27 views

How can I make a Driver expression access image RNA data through the image texture node?

So still trying to automate some processes. I am trying to use drivers to access information about an image (pixel x/y size and DPI) The location is simple bpy.data.materials['Fabric'].node_tree.nodes[...
1
vote
0answers
13 views

Textures inverts in animation

I am new to Blender and got the task from my teacher to create a driving vehicle. Now I am having a problem with the rotating wheels. When they are rotating, somehow the textures are inverting. So ...
1
vote
0answers
27 views

Using drivers to rotate an angled lattice

I am trying to use drivers to rotate this lattice along it's local Y axis. But when I move the driver object it rotates along the world's y axis instead. This is my driver setup.
0
votes
0answers
18 views

How to adjust correctly a corrective shapekey?

I have a corrective shape key for the elbow, and an expression that uses the rotational difference to a helper bone setup as a reference, like the tutorial of rig tips 2 from auto rig pro: https://...

1
2 3 4 5
10