Tuning for Rendering Speed

If the scene is dropping frames, there are several areas to tune.  You may not be able to use all of these depending on your setup, but these are nice things to have in your bag of tricks to speed up scene render and prevent dropped frames.


Most of these settings will be located under Scene tab.

  • Enable Antialising: disable anti-aliasing by un-checking this box.  Antialiasing is a process through which hard edges, corners and high-frequency patterns are soften to look more photorealistic and more visually pleasing.
  • Motion Blur: turn motion blur off by setting Motion Blur Scale to 0.0.
  • Enable Foreground: disable “Foreground Rendering” when possible by un-checking this box.  This make it so all CG elements are only rendered behind the live video plane.
  • Depth of Field: This is one of the most computationally expensive steps in the rendering process. Setting DOF to 0.0 will substantially lower rendering time.  The default value is 1.0, but the scale can be increased to emphasize the depth-of-field effect.  We recommend leaving this scale to 1.0 and simply changing the f-stop value parameter in Lens tab.
  • Keying Matte Horizontal and Vertical Blur: Set to 0 to remove chroma edge blurring. Required for correct interlaced field keying.
  • Show/Hide CG Objects: un-check “SHOW” for edit_ objects that are not being seen in the scene.  Previzion only renders CG elements that are in the view of CG camera.  However, it is helpful to hide elements that are not being seen to optimize render time. If your scene is built with edit_ objects you can disable elements of your scene that you may not need, or in older versions raise them very high or drop them very low on the Y access so their geometry doesn’t render since it isn’t in the field of view.
  • Remove unused video playback elements from the list of loaded elements.
  • Pause videos which are not going to be seen.