EJ Hassenfratz shows how to add contour lines to geometry using Cinema 4D’s Sketch and Toon, and covers concepts like applying gradients to 3D objects.
In the end, EJ creates an animated topological elevation map using animated sketch and toon lines so they draw on to the screen. Check out EJ’s tutorial for How to Create an Elevation Map Using Cinema 4D’s Sketch and Toon here.