Motion Blur Layer


About Motion Blur Layer

Blur is a graphical effect that aims to imitate an unfocused image. In a photography context blur can occur when the focal point of the lens is not at the right position of the target of the photograph. Also blur can have other origins. Blurs can happen as the result of a poor exposure during its recording (too long exposure time for a large movement of the object or a high movement of the recorder). Also blurring occurs when you use a very wide aperture (f4). In that case the objects that are out of focus are very blurred compared to the situation where the aperture is fully closed (f22).

In a graphical context, blurs are effects that imitate those situations (with more or less success). Motion Blur Layer allows to simulate the blur of picture, that arises by movement.

Parameters of the Motion Blur Layer

The parameters of the Motion Blur Layer are:

Name Value Type
Type_time_icon.png Aperture 0f time
Type_real_icon.png Subsamples Factor 1.000000 real
Type_integer_icon.png Subsampling Type Hyperbolic integer
Type_real_icon.png Subsample Start Amount 0.000000 real
Type_real_icon.png Subsample End Amount 1.000000 real


The Aperture parameter indicates the number of frames used to compute the effect of motion. The concept is analogous to the shutter speed or exposure time in photography.

Subsamples Factor

The Subsamples Factor affects the number of Subsamples to be computed. Using a high value, the smudge is finer, but the rendering takes longer as it involves much more computations.

Subsampling Type

The Subsampling Type parameter indicates the type of Subsampling used between:

  • Constant
  • Linear
  • Hyperbolic

Subsample Start Amount

The Subsample Start Amount parameter indicates the value of Subsample at the start. For example, if Subsample Start Amount is set to 0, it won’t have any blur on start. Otherwise the motion of objects from lower layers begin as a smudge.

Subsample End Amount

The Subsample End Amount parameter indicates the value of Subsample at the end. For example, if Subsample End Amount is set to 0, the last state of the objects from lower layers will appear without any blur.


  From Subsample Start 0 to Subsample End 1 From Subsample Start 1 to Subsample End 0


  • Rows in table – Aperture value from beginning (frame 0) to end (frame 120).
  • Columns in table – Subsample Start Amount value and Subsample End Amount value

Sample file

See also

  • A short description of the blur layers can be found here: Layer
  • Radial Blur Layer with a radial control of the size of the blur.
  • Blur Layer mostly used types of blur.