adds saveMesh(), draws the image only in 2d,

Signed-off-by: Marcel Schwittlick <marzzzel@gmail.com>
now computes the normals properly
adds functionality to save the mesh
properly clones the image

Signed-off-by: Marcel Schwittlick <marzzzel@gmail.com>
adds a button to save the mesh to the gui

Signed-off-by: Marcel Schwittlick <marzzzel@gmail.com>
returns the roi of an image in an separated image

Signed-off-by: Marcel Schwittlick <marzzzel@gmail.com>
adds an example stamp

Signed-off-by: Marcel Schwittlick <marzzzel@gmail.com>
adds a testimage

Signed-off-by: Marcel Schwittlick <marzzzel@gmail.com>