Questions tagged [drivers]
Blender drivers are a way to control values of properties by means of a function, or a mathematical expression. Use this tag for questions about Blender drivers.
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How to add a driver to a shape key and modify the fcurves through Blender python?
My question is how do I reference a the fcurve modifier on a shape key driver in Python? I have the following code at the moment:
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Using a two button mouse, how do I add a driver to any axis?
With a normal mouse you can easily access another panel when right clicking the specific axis as wished but I am unable to do this because I am using an i-mac provided mouse which despite emulating ...
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Need help converting a distance value to a decimal value between 0 and 1
I have an object (a rollaway shutter panel) that I have set up with the Mask node and a linear gradient.
I have another object (the shutter handle) that I want to use to control the Mask threshold ...
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What does 'pose.bones' mean in driver path?
I saw the corrective smooth modifier applied to the pants part while looking at the Ellie demo file. The monitor had drivers on it. There, in the path section, it was written as pose.bones["...
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How do I link to objects movement with each other?
I want to create like a animation but not a animation, so what I want is whenever I rotate cube number 1 I want number 2 to go in a vertical movement, so when I rotate cube 1 by 360 degree cube 2 ...
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How can I have multiple driver set-ups over one duplicated node group?
I'm currently designing my first custom node in order to be able to apply variations of the same complex shader to multiple objects.
The green highlighted values are linked to color ramps sliders in ...
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Add Input variable on driver shapekeys with python
I try to transfert a facial animation using shapekeys from one model to my target model using Rigify rig and drivers facial animation.
It works to do it by hand with this technique :
I copy as new ...
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How to use empties in a cloth simulation with geometry nodes
i have set up a cloth simulation with six cloth objects, each is 1,5m wide and 6m high. I have placed three on the left side of a stage and the other three on the right side of the stage. To each (...
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How do I reference the length of a curve as a driver variable for the screw modifier?
I would like the screw setting to automatically change with the length of the curve to achieve a stretching effect. Here's an example of what I'm looking for.
This was made by calculating the ...
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Why does this code for adding a driver cause Blender 2.83 to hard crash?
This code is run as part of a loop which iterates over selected objects. When I remove this block of code, the rest runs fine, but if I include this block it causes a hard crash.
trb_n is a shader ...
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How to make a driver from a value resulting of calculation in geometry nodes, to drive a parameter in a shader?
In geometry node, I made a quick setup to calcul the distance between my geometry and the camera. I'd like to get the result of this calculation to make a driver, for driving a scale maping parameter ...
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spinning a propeller (propeller changes its rotation direction and speeds up before stopping)
iam trying to control the rotation speed of a propeller in Blender using a custom property for RPM (Revolutions Per Minute), and i want the propeller to gradually increase from zero to a high speed ...
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Driver that determine is Shading of specific Viewport = 'RENDERED'
I want to make a driver, that will return 1 or 0 depends on is specific viewport shading type = ...
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How to drive rest pose bone positions? (For procedural facial rigging)
I am using bones to emulate facial muscles and I would like the head of each bone to automatically stay attached to an associated vertex, so that when I apply my topology for different characters the ...
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#frame driver is not uniform/linear
I am using #frame to drive the Y-coordinate of my Voronoi texture in Blender.
However, the resulting animation is not linear, ...
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Blender Driver not rotating
I did a very simple example:
Created a cube
Created empty axis
on Cube > Transform > Rotation > X added driver, chose Empty as the Object and Type as X Location.
I was hoping that on moving ...
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How to drive two shape keys, one at a time, with one bone?
I want to use shape keys only (no weight painting) for the eyelid rig.
How do I make a driver work for two shape keys one at a time?
I've struggled with what values or expressions to input when making ...
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How to add a driver to a single component of a vector with Python script?
When using Python to add a driver to a vector, i.e. the constant offset of an array modifier, it adds drivers to all three components while I only need to drive one of them.
Is there a way to add a ...
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Auto-fixing transform after enabling/disabling child of constraint
I don’t have a particularly specific problem, rather a common one and I have never seen anyone trying to solve it in this way.
Is there a way to automate the change in bone/object position when the ...
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Trouble with custom driver
I need to write a custom driver function (because the algorithm I need is too complex to put into a single line). So, I thought I'd try making a custom driver...
I opened the file editor, pasted my ...
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Driver based off rotation speed
Hello I want to make a driver that's value increases and decreases based off of how fast an object is rotating. such as a for a tank turrets motor when the turret is rotating
Thank you For any Help
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Driver for controlling the splaying of finger bones using the Z scale of a controller bone
I have a pretty simple hand rig with only 3 fingers, and I want a controller bone to drive the local X rotation of the entire finger so that an increase in the Z scale of the controller bone increases ...
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How to rotate an object to continually touch the uneven surface of another rotating object?
How to rotate an object to continually touch the uneven surface of another rotating object?
Object A (black) rotates using a variable speed driver to another
object's rotation. Object A has an uneven ...
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Want a way to export blender animation which uses deform modifiers and drivers
I've created a page flipping animation in blender using some simple key frames to rotate the plane 180 degrees and some modifiers with drivers so the movement is not entirely rigid. Two deform ...
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Make a Variable Speed Rotation Driver to Influence Another Object
What I want to achieve starts pretty standard: the rotation of object A rotates object B. I use a driver. No prob.
Where I’m stuck is that I want certain portions of A’s rotation to rotate B faster ...
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"use self" in driver inside Geometry Nodes
I need to make a geonode that will be used by several objects.
I need to use a custom property inside the geonode.
This custom property is carried by the object that uses the geonode.
I thought that ...
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Corrective shape keys for IK-driven bone
The bottom bone here is affected by an IK chain:
Unfortunately, it's rotational value doesn't change unless I rotate the bone directly.
This is a problem, because I want to use it's rotational value ...
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how do I make one empty accelerate to the second?
The movement driver already looks in the direction of the empty, and I want it to accelerate towards it as well. I've tried making a function, adding it to driver namespace, but I still get the "...
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Python: Add Shape Key As Driver for Other Shape Key By String Reference
In Python, I need to add a driver to specified target shape key, driven by specified source shape key's value (linking the target's value to the source's.)
An example print of the information I have:
<...
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Bone rotation offset help
I have a series of bones that I want to rotate using only one bone.
Rules:
The rotation of the effected bones rotate only along x axis
The effector bone has a fall off value
The effector bone slides ...
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Expression for Additive Transform Noise
May I reference the current property's value before an expression in an expression?
This driver expression will generate random values between -1 and 1:
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How can we make two corrective shapekey driver values to work 50/50 percent each of them to avoid stacking when they move in the same direction?
As I show in my images, when my shapekey drivers both move in the same direction, their powers stacks to each other. I need them to not to stack.
Thanks in advance for replies.
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Change ocean modifier wave direction setting to global coordinates
The Ocean modifier has a "direction" parameter among the settings.
Is there a way to make that a Global setting? It is currently "local x" according to the manual.
Alternatively, ...
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Script to add a driver to "hide" a bone
I'm tryng to write a script that adds a driver to some bones automatically. But I'm facing some problems with the property "hide".
I want to add the driver into the property "Hide" ...
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How to access geometry nodes output value to use as a driver? [duplicate]
This is my setup:
I want to use the 'x' output as a driver for the mesh line endpoint.
I think this answer outlines what I'm supposed to do, but I don't understand how I'm supposed to use scripts.
I ...
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Help Fix shapekeys to custom bone properties addon
There's this free addon that allows creation of custom driven properties from shapekeys automatically using python by selecting the mesh then the bone you want to assign the custom properties in pose ...
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Rotate objects in specific relation to one another
Okay, think of an analog clock, as an easy point of reference. I rotate the minute hand 360 degrees on the X-axis. Can I somehow couple the performed rotation of the minute hand to the hour hand in ...
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Use a custom noise driver for multiple objects without sharing noise seed
I have this blinking driver. I want to use it on multiple characters during a scene except they blink at the same time and interfere with each other.
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How Can I Control Emission Strength from a Light's Power Using a Driver
I'm trying to set up a material's "Emission Strength" so that it is controlled by an area light's "Power" value (for example, adjust the light's power, and the emission strength ...
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Dependency cycle frustrations
I often see Dependency cycle detected console errors, but have innocently ignored them as I feel there is an arcane technical language behind the references such as:...
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can cos() function have more variety in terms of animation movement?
I always use cos() driver expression to make simple loop animation.
1st animation curve is baked result of cos(frame/5) of driver expression.
And I think it's too predictable and it needs to be 2nd ...
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Driver not working anymore when appending custom node group
I am creating a custom node group for the Compositor, and I would like to control the size of a cloud texture with a driver within the node group. However, after appending the node group to a new ...
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How can I start a driver at a specific frame?
I want to add a rotation driver so I add #frame / 7 to Rotation X in my case, it works great, but I want to it to start a bit ...
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Mirror expression
How can I rewrite an expression?
I have this expression written by Leander
min(1, max(0, Rest - CL) / max(0.001, FL-CL)) * 0.1
It drives a variable bone from 0 to ...
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Random driver expression for automated blinking
I have a character with eyes.
I have a blink shapekey. and I am using this expression as a driver to randomly blink on certain frames
noise.random() > 0.97
...
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How to convert shape keys into weight bones?
Simply put I have a low poly model with little no skills in clean facial rigging so I use shape keys to give me a better output than what I can do.
Although I was able to setup shape keys and drivers ...
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An equivalent of "Sample Curve" but in a driver expression?
I would like to utilize a curve tangent or a curve normal in my driver (i.e. in its Scripted expression)
When working with geometry there's the "Sample Curve" node for that. Is it possible ...
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Geometry Nodes - Unique Frame Offset for Each Instance?
I am currently working on an animation that resembles a split-flap display like the ones you'd see in an airport. To accomplish this, I am using Geometry Nodes to instance several modules on a plane. ...
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Manual value with a driver
I want to add a driver to the rotation of a bone in pose mode, but I also want to use that rotation manually. In other words, I want the rotation to be calculated by summing the manual value and the ...
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Can I reference "this" when calculating Distance in the Driver dialog?
Is it possible to reference this/self in the "Object 1" or "Object 2" Distance inputs?
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