This tool allows you to clone according to the perspective you want. First, set the wanted vanishing lines by checking the Modify Perspective Plane option, working in the same way as with the Perspective tool. Then check the Perspective Clone option and work in the same way as with the Clone tool.
There are different possibilities to activate the tool:
From the image-menu:
→ → ,
The Tool can also be called by clicking the tool icon:
in the Toolbox.
Ctrl-click allows you to select a new clone source.
When the source is set and you press this key, you will see a thin line connecting the previously clicked point with the current pointer location. If you click again, while continuing to hold down the Shift key, the tool will clone along this line. Particularly useful when cloning from a pattern.
The available tool options can be accessed by clicking on the tool icon
in the Toolbox.
The options of this tool are common with those of the Clone tool.