Smoothing Keys using Filters

This topic shows how to smooth keys using filters. To follow the instructions, download the file and script from http://area.autodesk.com/downloads/scripts/motionbuilder-animation-scripts.

  1. Open the filters_butterworth.fbx file in MotionBuilder.
  2. Run the filters_butterworth.py script to remove the noise in the FCurve. The FCurves appear smooth as shown in the following figure.

You can use the other filters in a similar way as explained in this topic. You need to do the following:

  1. Create a filter using FBFilterManager().CreateFilter ('<Filter’s Name>').
  2. Set the properties using lFilter.PropertyList.Find (‘<Property Name>').Data = <Property Value>.
  3. Set the start and stop time using lFilter.Start = FBTime(0, 0, 0, 15).
  4. Execute the filter using lFilter.Apply (<FCurve_Node_Object>, True).

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