Drivers Panel Blender Tutorial
'How to use drivers in order to quickly add some wave motion to your objects.' 'Blender: Automatic sine wave motion with drivers'. 'Blender 3D Tutorial - Best Way to UV Unwrap Cube & Make Sky-Box (1) by VscorpianC - YouTube' Proximity Decimation Technique in Blender. Drivers Panel. Settings; Example; Workflow & Examples. Workflow; Examples; Drivers and Multiple Relative Shape Keys; Troubleshooting. Scripted Expression; Rotational Properties are Radians; Intra-armature Bone Drivers can Misbehave.
Reference
Editor: | Graph editor |
---|---|
Mode: | Drivers |
Panel: | Sidebar region ‣ Drivers |
Hotkey: | N |
Reference
Menu: | Context menu ‣ Edit Driver |
---|---|
Hotkey: | Ctrl-D |
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. |
_
.The type of variable to use.
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.
Retrieves the value of a Transform channel from an object or bone.
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.
Expressions¶
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.
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.