Function available in CINEMA 4D Prime, Visualize, Broadcast, Studio & BodyPaint 3D
N-gon Triangulation
Cinema 4D internally triangulates n-gons when rendering or animating them. You can preview these triangles directly in the viewport by enabling the N-gon Lines option in the viewport settings (Filter page).
If N-gon Triangulation mode is enabled, an n-gon will be internally retriangulated each time you move one of the n-gon’s points.
If the mode is disabled, you can retriangulate the n-gons manually by choose Mesh / N-gons menu.