Numeric Input Fields¶
Numeric input fields store values and units.
First type of numeric input field shows triangles pointing left (◂) and right (▸) on the sides of the field when mouse pointer is on top of the field. Second field type sliders have a colored bar in the background to illustrate value over a range, e.g. percentage values.
The value can be edited in several ways:
- Incremental Steps
- To change the value in unit steps, click LMB on the small triangles (only available on first field type). You can also use Ctrl-Wheel while hovering over the field to edit the value.
- To change the value with mouse, hold down LMB and drag to left or right.
- Keyboard Input
Press LMB or Return to enter value by typing it with keyboard.
When entering values by keyboard, numeric fields work like text fields:
- Press Return or LMB outside the field to apply the change.
- Press Esc or RMB to cancel.
- Press Tab to jump to the next field or Ctrl-Tab to go to the previous field.
- Press Minus while hovering over a numeric field to negate the value.
You can edit multiple numeric fields at once by pressing down LMB on the first field, and then drag vertically over the fields you want to edit. Finally you can either drag left or right to adjust value with mouse, or release the LMB and type in a value.
Most numerical values are restricted by “soft limit” and “hard limit” value ranges. Changing value by dragging with mouse is restricted to “soft limit” value range. Input via keyboard can allow use of wider value range, but never wider than “hard limit”.
You can enter mathematical expressions into any numerical input field.
For example, enter
10/5+4 instead of
Even constants like
pi (3.142) or functions like
sqrt(2) (square root of 2)
may be used.
These expressions are evaluated by Python; for all available math expressions see: Math module reference.
Expressions as Drivers¶
You may want your expression to be re-evaluated after it is entered. Blender supports this using Drivers (a feature of the animation system).
Expressions beginning with
# have a special use.
Instead of evaluating the value and discarding the expression,
a driver is added to the property with the expression entered.
#frame is a quick way to access map a value to the current frame,
but more complex expressions are also supported
#fmod(frame, 24) / 24 for example.
This is simply a convenient shortcut to add drivers which can also be added via the RMB menu.
As well as expressions, you can specify numbers and units. If no unit is given, then a default unit is applied. The unit system can be changed in scene settings.
You can use either the unit abbreviation or the full name after the value.
Examples of valid usage of length units include:
- Decimal separator is optional.
- You can mix units, e.g. metric and imperial even though you can only show one at a time.
- Plurals of the names are recognized too, so
meterscan both be used.