Procedural Compositing with Batch > Batch: Node Reference > 3D Blur Node >
Simulating a Motion Blur Effect

The motion blur simulates the blur created by a fast-moving object or camera.

A blur effect can be created with front clip input and a clip with forward motion data input into the Forward Flow tab.

Use the Motion Blur Profile to define the opacity of the blur. The opacity increases at the top of the curve. By default, the blur is more transparent further away from the pixel. The midpoint represents the opacity of the blur at the position of the pixel.

Motion Blur button
  Enable the motion blur controls, which you use to apply the effect to the image.
Length field
  Displays the amplitude of the motion blur.
Width field
  Displays the width of the blur.
Rotation field
  Displays the angle of rotation to apply to motion vectors connected to the node through the Forward Flow tab. Motion is rotated counterclockwise.
Reference button
  Enable the reference controls, which you use to apply a reference point at which motion blur is negated.
Set button
  Subtracts the motion blur based on the motion analysis of a reference point at the selected frame. Motion blur will be negated at the selected point. Enable this button to apply the motion blur only to objects that do not have the same relative motion as the selected pixel. This button is enabled automatically when you edit values in the X and Y fields.
Set Reference colour pot
  Set the colour of the crosshair that marks the reference point in the image window.
X and Y fields
  Enter the horizontal and vertical position of the pixel to use as a reference point at the selected frame. A reference point can be selected directly in the frame using the cursor.