This node creates an index based falloff that associates input Start Value to all objects with index less than some input index and the input End Value to all objects with index more than some input index, while the objects at indices in between are associated with values in between the Start Value and End Value evaluated at the input interpolation.
The examples above shows the fade falloff node in action. We offset the
vertices of the line by one unit in the z-axis and used the Fade
Falloff node as a factor for that offset. The Start Index is set
2 so all vertices with index less than or equal
2 are offset
units in the z-axis because the original offset multiplied by the
Start Value is
1x2=2. The End Index is set to
6 so all
vertices with index larger than or equal
6 are not offset because the
original offset multiplied by the End Value is
1x0=0. Indices in
between however (from
6) are offset with amounts linearly
2. Had I used a non-linear interpolation,
values will no longer linearly change as in the following example:
Notice how they are changing exponentially and how the start value affected the offset.
Options are only different on how the start and end index are defined.