Drivers Panel

Reference

Editor:Graph editor
Mode:Drivers
Panel:Properties region ‣ Drivers ‣ Drivers
../../_images/animation_drivers_drivers-panel_panel.png

Drivers panel.

This panel is located in the Graph Editor with the mode set to Drivers.

The Drivers panel is for setting up Driver Variables or a Scripted Expression which will determine the value of the Driver Value.

Settings

Update Dependencies
This will force an update for the Driver Value dependencies.
Remove Driver
Removes the driver from the property.
Type

There are two categories of scripts: built-in (average, sum, minimum and maximum) and custom scripts (Scripted Expressions).

Average Value
Uses the average value of the referenced Driver Variables.
Sum Values
Uses the sum of the referenced Driver Variables.
Scripted Expression
Uses a Scripted Expression. See Expression. You must write a Python expression which performs your own calculations on the Driver Variables.
Minimum Value
Uses the lowest value from the referenced Driver Variables.
Maximum Value
Uses the highest value from the referenced Driver Variables.
Expression
Scripted Expression. Here you can add variables, real numbers, math operators, math functions, Python properties, driver functions. See Driver Expression below for some examples.
Use Self
This allows for drivers to references their own data using the variable self. Useful for objects, bones, to avoid having to create a variable pointing to its self.
Show Debug Info
Shows the Driver Value.
Driver Value
The output value of the driver script.

Driver Variables

../../_images/animation_drivers_drivers-panel_transform-channel2.png

Transform channel setup.

../../_images/animation_drivers_drivers-panel_distance.png

Distance setup.

Variable are references to properties or delta transformations which are a reference to two properties.

Add Variable
Adds a new Driver Variable.
Copy/Paste
Uses the copy of the current variable stack so it can be pasted onto another object’s variable stack.
Name
Name to use for scripted expressions/functions. No spaces or dots are allowed and must start with a letter.
Variable Type

The type of variable to use.

Single Property

Use the value from some RNA property. For example, the Ambient shading color from a material. (see Fig. Setup of a single property.) First select the type of ID-block, then the ID of the ID-block, then copy and paste an RNA property Ctrl-V. See also Custom Properties.

ID Type
The ID-block type. For example: Key, Image, Object, Material.
ID
The ID of the ID-block type. For example: ”Material.001”.
RNA Path
The RNA ID name of the property. For example: ’ambient’ from material shading.
Transform Channel

Use one of the Transform channels from an object or bone.

ID
ID of the object. For example: Cube, Armature, Camera.
Bone
ID of the Armature bone. For example: ”Bone”, ”Bone.002”, ”Arm.r”. This option is for armatures.
Type
For example, X Location, X Rotation, X Scale.
Space
World Space, Transform Space, Local Space.
Rotational Difference
Use the rotational difference between two objects or bones.
Distance
Use the distance between two objects or bones.
Value
Shows the value of the variable.

Example

../../_images/animation_drivers_drivers-panel_single-property.png

Setup of a single property.