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

Discard Projection

This command clears the selected projection layer and creates a new, empty layer. The projection is not applied to the scene. Even Undo will not restore a projection layer once you have deleted it.