Drivers Panel Blender Tutorial

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Reference

Editor:Graph editor
Mode:Drivers
Panel:Sidebar region ‣ Drivers
Hotkey:N

Reference

Menu:Context menu ‣ Edit Driver
Hotkey:Ctrl-D
Cursor

This panel is visible in Sidebar of the Drivers Editoror as a popover when adding a driver to a property.

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It shows the property that is being driven, followed by a series of settingsthat determine how the driver works.

Driver Settings¶

Type¶

There are two categories of drivers:

  • Built-in functions (Average, Sum, Min and Max)

    The driven property will have the value of the average, sum, lowest or highest (respectively)of the values of the referenced Driver Variables.If there is only one driver variable, these functions will yield the same result.

  • Custom (Scripted Expression).

    An arbitrary Python expression that can refer to the Driver Variables by name. See Expressions.

Driver Value¶

The current result of the driver setup. Useful for debug purposes.

Update Dependencies¶

Forces an update for the Driver Value dependencies.

Show in Drivers Editor¶

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Opens the fully featured Drivers Editor.This button only appears in the popover version of the Drivers panel.

Driver Variables¶

Variables are references to properties, transformation channels, or the result of a comparisonbetween transformations of two objects.

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Drivers should access object data via Driver Variables, rather than direct references in the Pythonexpression, in order for dependencies to be correctly tracked.

Add Input Variable
Adds a new Driver Variable.
Copy/Paste Variables
Copies the current variable list so it can be pasted into another driver’s variable list.

Single property.

Distance.

Name
Name for use in scripted expressions.The name must start with a letter, and only contain letters, digits, or _.
Variable Type

The type of variable to use.

Single Property
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Retrieves the value of a RNA property, specified by a] for a custom property.

Tip

The easiest way to create a variable of this type is to use theCopy As New Drivercontext menu option of the input property, and paste the resultinto the driver via Paste Driver Variables.

Transform Channel

Retrieves the value of a Transform channel 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.

The Average Scale option retrieves the combined scale value,computed as the cubic root of the total change in volume.Unlike X/Y/Z Scale, this value can be negative if the object is flipped by negative scaling.

Space
World Space, Transform Space, Local Space.
Rotational Difference
Provides the value of the rotational difference between two objects or bones, in radians.
Distance
Provides the value of the distance between two objects or bones.
Value
Shows the value of the variable.

Expressions¶

Expression

A text field where you can enter an arbitrary Python expression that refers toDriver Variables by their names.

The expression has access to a set of standard constants and math functions providedin the Driver Namespace. For an example of adding a custom function to the namespace,see the driver namespace example.

For performance reasons it is best to use the Simple Expressions subset as much as possible.

Use Self

If this option is enabled, the variable self can be used for drivers to reference their own data.Useful for objects and bones to avoid having creating a Driver Variable pointing to itself.

Example: self.location.x applied to the Y rotation property of the same objectwill make the object tumble when moving.

Note that dependencies for properties accessed via self may not be fully tracked.

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Simple Expressions¶

Blender can evaluate a useful subset of Python driver expressions directly,which significantly improves performance, especially on multi-core systems.To take advantage of this, the driver expression must only use the following features:

Variable Names
Use only ASCII characters.
Literals
Floating point and decimal integer.
Globals
frame
Constants
pi, True, False
Operators
+, -, *, /, !=, <, <=, >, >=,and, or, not, conditional operator/ ternary if
Functions
min, max, radians, degrees,abs, fabs, floor, ceil, trunc, int,sin, cos, tan, asin, acos, atan, atan2,exp, log, sqrt, pow, fmod

Simple expressions are evaluated even when Python script execution is disabled.

When an expression outside of this subset is used, Blender displays a “Slow Python expression”warning. However, as long as the majority of drivers use simple expressions, using a complexexpression in select few is OK.

See also

  • Extending Blender with Python.
  • Python and its documentation.
  • functions.wolfram.com.