: You can find it by searching "CLF Shape Bender" on the SketchUp Extension Warehouse or SketchUcation .
Click the (or go to Extensions > Chris Fullmer Tools > Shape Bender). Click the Reference Line (the straight line). Click the Target Path (the curve). plugin sketchup shape bender
The elegant, S-curved line he had drawn for the plaza floor. : You can find it by searching "CLF