Cinema 4D / BodyPaint 3D Program Documentation Reference BodyPaint 3D Tools Menu Projection Painting
Function available in CINEMA 4D Prime, Visualize, Broadcast, Studio & BodyPaint 3D

Project on Hidden Polygons

Circular painting pattern with (bottom) and without (top) Project on Hidden Polygons tool activated.

This option is only available for Projection Painting. It defines whether or not hidden polygons that lie in the direction of the projection should also be included when painting.