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

Outline Polygons

Strokes the edges of the selected UV polygons with the active color and brush. This is useful for marking out the positions of the UV on the texture. This command works on the active layer only.