Animation Track to Spline
Export a spline from animated geometry for use in other software
Interactive Node Diagram
Animation Track to SplineSOP
Pack
Pack the geometry since we only need its position data here.
Extract Centroid
Get center point of packed geo.
Add
Add single point for trail.
Trail
Set trail length to $FEND (end of frame range).
Timeshift
Set frame to $FEND (end of frame range) since we just want the end result.
Add
Polygons > By Group, N: 2.
Null
We get a spline from all the separate points, each representing position data.
ROP_FBX
Export as FBX. Can now bring into C4D or other software, with the spline used as a track. For example, add a camera with align to spline tag, then animate camera position by location on spline.