ScalarInterpolator

Definition :

ScalarInterpolator {
  eventIn      SFFloat set_fraction
  exposedField MFFloat key           []
  exposedField MFFloat keyValue      []
  eventOut     SFFloat value_changed
}

Explanation :

This node linearly interpolates among a set of SFFloat values. This interpolator is appropriate for any parameter defined using a single floating point value, e.g., width, radius, intensity, etc. The keyValue field must contain exactly as many numbers as there are keyframes in the key field.