Choosing a Source Point

When cloning from a particular channel, the Clone Stamp tool takes a “snapshot” of that channel as it appears on screen and uses that as the source. As a result, the resolution of the cloned texture can depend on the current
display resolution within Mari. Higher display resolutions give better cloning results, but can dramatically slow Mari's performance.

When cloning from a source point on the model's surface, bear in mind that the shape of the model determines what gets cloned. For example, if your source point is on a part that sticks out from the model, the space between that part and the rest of the model does not provide a source texture when painting.

The original model, with clone point set in the paint on the arm.	See how the cloned texture comes directly from the surface as seen in the view.