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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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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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0answers
6 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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17 views

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 ...
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1answer
29 views

Blender 2.8 Beta (Linux Mint 19.1): No compatible GPUs found - Vega 64 Nitro+

I can't find any working information, how to fix this, and before I was trying to install some other drivers for my Vega, but i accidentally broke my previous installation.
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2answers
46 views

Blender 2.8 Beta: OpenGL 3.3 Error?

Before I start, YES, I have done my own research - I know how annoying a repeat question is. Yet each answer is so specific to others... When I tried the beta 2.8 64 bit, it says "Blender requires a ...
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0answers
29 views

Shape key and driver Problems Blender 2.8

I'm rigging a character and I would like to fix spots that weight painting won't fix with shape keys. But assigning bone as a driver doesn't do anything. It's controlled by an IK bone and doesn't seem ...
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0answers
21 views

Can I control a Particle System seed with a driver in Blender 2.8?

I am creating a series of randomized scenes for a D&D Battle Map project. I would like to do as little effort as possible, naturally, so I am trying to generate a few instances of the same scene ...
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0answers
8 views

Retrieving the Material from a NodeTree

For a driver scripted expression I want the name of the material for a node input value. It's an emission node and I want to make the following scripted expression for the emission strength: ...
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1answer
38 views

Is there a way to copy the drivers of the active object

Is there a way for selected objects to copy (or link) the drivers of the active object? with Ctrl+L we can copy many properties from active to selected, including object data, material, modifiers......
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0answers
8 views

Is possible to drive X uvwarp location with bone rotation?

I'm trying to do something similar to this video 2D Eyes Maya to UE4 In it, they show a rig that uses a bone rotation to drive the X- uv offset to change the eye texture in Maya, in Blender, that ...
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0answers
15 views

Blender 2.8 eevee - Is there a limit for image nodes quantity in a material?

I'm making a customizable character with switchable skin via driver. It is organized by 9 types of skin and each type with 3 make-up as you can see in the 1st image. A total of 27 images. So the ...
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1answer
17 views

View Expressions curve in Graph Editor

I've animated some channels, such as rotation channels and a modifier value using Expressions. But I can't find out how to view the resulting Driver curve in the Graph Editor. I'm using Blender 2.8. ...
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1answer
27 views

How can I animate the rotation quaternion of an object with just one driver?

Updated Question (driving orientation instead of location) I'd like to animate the orientation of an object using one single driver, but it seems that the UI only let's me animate each coordinate of ...
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2answers
18 views

One shape key, multiple bones driving it

I have a character that has 1 shape key that controls the shape of her thighs (both left and right). What I'd like to do is control this shape key with a driver when either the left or right foot is ...
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1answer
20 views

Control MixShader value by shape key value

I have a Mix Shader mixing two textures and one shape key applied to an object. I want to control the mix shader value from the shape key slider. I think this is achievable by using drivers but i ...
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1answer
47 views

How can I limit frame count by counting a text list?

I have a list of names in a Text Block that are separated by line. There will be different amounts of names. I am using the list to generate titles but want to render one title per frame. I want to ...
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3answers
61 views

Linking value to another anywhere in blender 2.8

i want to link value from one value to another. sort of instancing but for values. for example in this case below: monkey red and monkey green have a mix color node that both drive them to white if ...
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0answers
33 views

Use self and the slow python expression

In putting together an answer to Changing Multiple Influences Simultaneously I came across the Slow python script warning in the drivers editor Using a set up as outlined here driving a pose bone's ...
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1answer
67 views

Problem with drivers value's statement

i set up cube rotation and movement by object near by cube,but i also want to set up its z location so it cannot penetrate through plane every time it move forward and backward,there is some problem ...
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1answer
23 views

Offset on driver via scripted expression

I am trying to rotate a set of limbs on a centipede all slightly offset from each other in a 360 degree cycle. Each one will have a driver with an offset, thus the centipede would walk as seen here ...
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1answer
36 views

Problem to update fcurve driver

My problem is get the "angle" for updating the expression inside , in this example the expression is a simple string for explain , but i want controll expression by floatprop(that is not a problem) ...
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0answers
18 views

When a Driver is being evaluated are the final positions of objects finished evaluating?

When a Driver is being evaluated are the final positions of objects finished evaluating? Does the Dependency Graph take into account references made in a Driver for a topological sort? The Blender ...
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1answer
25 views

Add Min and Max Values to Driver Expression?

I have a driver using a scripted expression: var*2. It's working great but the values it's outputting range from .005 up to about 1.5. I'd like to limit the range of the output to something like a ...
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0answers
57 views

How to make abs() give correct result for negative numbers?

I am trying to use the simple absolute function abs() in Expression frame for a driver, but it won't work. I've tried to put it in long sentences, or even just typing abs(-1) but the negative still ...
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1answer
60 views

Baking camera property drivers to keyframe

I know its possible to bake the values of drivers to keyframes using Object > Animation > Bake Action but is there a way to bake a driver that is controlling ...
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1answer
58 views

Empty controlled light grid

I'm still not an animator in any way but I have to find a way to animate something... In a way resembling to what is achieved in this video, I have to create a grid of light bulbs which intensity and ...
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2answers
139 views

Change a Driver based on which Scene is being Rendered

I am looking to drive a property in a material node based on the current Scene when rendering. The purpose would be to mix between two different parts of the node tree so that one Scene renders one ...
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0answers
11 views

Visual keying on bone driving shape key issue

I'm rigging in blender a character with clothes that can be put off ( ex : the character undresses in one animation) To do this, bones that affect the pullover's mesh are constraint ( child of ) by ...
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0answers
16 views

Make Drivers Control Textures?

I'm working on a model right now with an image sequence. I only want the texture on my character to animate when a particular bone is being animated. When it's resting I want the texture to rest. I ...
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0answers
19 views

Drivers / Constraints resourses usage

I'm trying to optimize the rig of a cartoon creature, and this rig has really large amount of bones (more than 400) to have all the abilities according to the plot. I have IK/FK chains, Stretch To ...
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1answer
97 views

Material driver works, but doesn't update in viewport [duplicate]

I'm on Blender 2.79. When using drivers on node properties the material doesn't update on the Rendered/Material viewports until I force reload it. My drivers are pulling custom object properties from ...
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1answer
56 views

Copy drivers from one Armature to another of the same kind

I have a mesh/armature combo, which I developed in a good amount of steps. The first iteration has drivers for bones which drive other bones of the armature. While developing the neither the armature ...
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1answer
43 views

How to write drivers to be copied and pasted between objects' modifiers?

I have assigned a script-expression driver to a field in a modifier. The expression is a function of properties of the object to which the modifier is assigned, extracted as Single Property variables. ...
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1answer
15 views

Is there a way to restrict the operation of a driver or even record the action of the driver in Blender

I have a small animation playing and I have made use of some trajectory equations in order to obtain a more realistic jump in the form of a driver, but I also want to add some additional movements to ...
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1answer
32 views

Pause in relationships and constraints

I want to talk about relationships between (for example) two bones. There are two bones (A and B), bone B has a Cconstraint, bone A is the target of that Constraint. Let the Constraint be "Child Of". ...
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1answer
46 views

I can't add drivers

So, I know how to add drivers, but for some reason it is not working at all. I go to my object and hover over rotation on the Z axis, then I press ctrl+d and choose Single from target and the problem ...
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1answer
49 views

How to transform (translate, rotate, scale) Vertex Groups using drivers?

I'm trying my hand at procedural modelling using Blender. Houdini is known for procedural modelling, however, I want to achieve the same with an open source software like Blender. I am currently ...
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0answers
20 views

Driver-based facial rigging streamlining?

I've been experimenting with the ManuelBastionLab of late. While I've been able to get some pretty good results, one thing I find rather awkward is the lackluster rigging that you get by default. ...
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0answers
32 views

How to set up wheel rotation with drivers so that it works correctly with the car following a path?

I have set up the wheel rotation with an empty object and drivers. It worked until I made a car to follow a path (empty of a car body follows a path). Then the wheels start to rotate in right ...
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1answer
28 views

Driver bone not working

For some odd reason I can't get my driver bone to work. I've followed tutorials, but whenever I move the bone on the Z axis (local) to control whether my eye opens or closes, it doesn't do anything. :-...
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0answers
25 views

How do you assign objects to seperate custom properties values?

I would like 5 objects to be placed on the same property but be hidden or shown when the value is changed to a number like 3 or 5 but increasing the values don't seem to work. I have a feeling I need ...
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1answer
194 views

nVidia driver causes flickering viewport background

I noticed a flickering background whenever I click a button or orbit in blender 2.8 or 2.79 It only happens when I use my NVIDIA 940mx but not when I switch to the integrated Intel 620. I can't ...
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1answer
37 views

How do you use drivers to hide an object or mesh?

instead of going into the outliner I would like to use the properties tab to change meshes. I've tried to look for some tutorials but most of them are on shape keys. For example; skin 1 is hidden and ...
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0answers
33 views

How to drive the color in node editor by the color of the light?

I want to control the color in the node editor by light color. After trying it myself, I guess I should probably get the RNA properties and enter it in the driver editor in the correct way. I ...
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0answers
46 views

Better to add extra bones before or after generate rig

Im using rigify addon and plan to add some shape keys and some drivers later on like for facial expressions and talking. Is it a good idea to add those driver bones to the metarig before I click ...
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0answers
61 views

The second emitter does not emit particles in the correct way

I'm trying to create a traffic simulation using the blender particle systems with different model of cars. The enviroment consists of a two-lane road. I want the cars crossing the two lanes in ...
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0answers
10 views

Looking for advice on realizing Blender scanner type project, maybe using sensors in Game Engine?

I have a project I want to start and I am looking for advice on the best direction to go using Blender. I am pretty new at Blender. Basically I want to create a 3D scanner type thing within Blender. ...
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0answers
26 views

Assign more than 2 shape keys to same object bone

Initially I had 2 shape keys for my eyebrows which I used as a driver using a bone z location (-3*var and 3*var). This worked fine. But now I wanted to create a third shape key. So after that I added ...
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1answer
158 views

drivers and custom properties for buttons

I'm just beginning to get into drivers and custom properties for bones and I was wondering if its possible to set up drivers or custom properties for buttons rather than sliders. The reason is I have ...
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2answers
80 views

Looping background (png image) in Blender for a car chase scene

While animating a car chase scene I need to have a background image (that includes trees, buildings etc) which moves from right to left and gets repeated in loops. I Couldn't find any driver or ...