# Scene Properties¶

## Scene¶

Reference

Panel: Properties editor ‣ Scene ‣ Scene
Camera
Used to select which camera is used as the active camera. You can also set the active camera in the 3D View with Ctrl-0.
Background Scene

Allows you to use a scene as a background, this is typically useful when you want to focus on animating the foreground for example, without background elements getting in the way.

This scene can have its own animation, physics simulations, etc, but you will have to select it from the Scene data-block menu, if you want to edit any of its contents.

Sets can themselves have a background set (they’re recursively included). So you can always make additions to existing scenes by using them as a background to a newly created scene where your additions are made.

Tip

This can also be used in combination with Linking to a Scene, where one blend-file contains the environment, which can be reused in many places.

Active Movie Clip
Active movie clip for constraints and viewport display.

## Units¶

Reference

Panel: Properties editor ‣ Scene ‣ Units
Unit System
None
Use units that have with no relation to the real world, practically this is the same as Metric just without unit names.
Metric
Use the metric unit system in this scene.
Imperial
Use the imperial unit system in this scene.
Unit Scale

Scale factor to use when converting between internal units and values displayed in the user interface. This can be changed when modeling at microscopic or astronomical scales.

Note

This only influences the values displayed in the user interface and not how things behave internally. For example, physics simulations don’t take the unit scale into account.

Separate Units
When using Metric or Imperial, display properties as multiple values. For example, 2.285m will become 2m 28.5cm.
Rotation
Degrees
Use degrees for angles in the user interface.
Use radians for angles in the user interface.
Length
The unit used for a specific value depends on the magnitude of the value. For example, some values might be displayed as 23cm while others are displayed as 10km.
Meters/Centimeters/Feet/…
A fixed unit that will be used for all lengths in the user interface.
Mass
See Length.
Time
See Length.
Imperial Length Units
Full Name Short Name(s) Scale of a Meter
thou mil 0.0000254
inch ", in 0.0254
foot, feet ', ft 0.3048
yard yd 0.9144
chain ch 20.1168
furlong fur 201.168
mile mi, m 1609.344
Metric Length Units
Full Name Short Name(s) Scale of a Meter
micrometer um 0.000001
millimeter mm 0.001
centimeter cm 0.01
decimeter dm 0.1
meter m 1.0
dekameter dam 10.0
hectometer hm 100.0
kilometer km 1000.0

## Gravity¶

Reference

Panel: Properties editor ‣ Scene ‣ Gravity

Options to control global gravity used for physics effects.

## Keying Sets¶

Reference

Panel: Properties editor ‣ Scene ‣ Keying Sets

See Keying Sets.

## Audio¶

Reference

Panel: Properties editor ‣ Scene ‣ Audio

Options to control global audio settings.

Volume
Volume for the scene.
Distance Model
Changes how the sound attenuation is calculated based on the distance. Most physically correct is the Inverse model, but it’s also possible to choose a linear and an exponential falloff. The clamped modes limit the volume to be lower than 100% (1.0), that means if the distance is smaller than the reference distance, the volume is always 100%. For an exact description of each option see the OpenAL documentation.
Format Settings

These settings, along with the settings found in the Encoding Panel change how sound is exported while rendering.

To control how sounds plays back from within Blender, see the audio settings in the Preferences.

Audio Channels
Sets the audio channel count. Available options are: Mono, Stereo, 4 Channels, 5.1 Surround, 7.1 Surround.
Sample Rate
Sets the audio sampling rate.
Doppler Speed
Speed of the sound for the Doppler effect calculations. The typical value is 343.3 m/s in air, in water for example this value is around 1560 m/s.
Doppler Factor
Controls how strong the Doppler effect is. You can exaggerate or attenuate the change of pitch, but physically correct is a factor of 1.0.
Update Animation Cache
Updates the audio animation cache. This is useful if you start noticing artifact in the audio.

## Rigid Body World¶

Reference

Panel: Properties editor ‣ Scene ‣ Rigid Body World

The Rigid Body World is a group of rigid body objects, which holds settings that apply to all rigid bodies in this simulation.