Can I use a scan of a painting, sketch or CAD drawing in PhotoModeler?

A 2D drawing from a CAD package or a hand-drawn picture instead of a photo cannot be used in PhotoModeler.

A drawing does not contain the geometry and perspective that a photograph has. A photograph's geometric properties are a product of a camera's focal length, format size (width and height), and principal point (x,y), while a CAD or other drawing does not have these inherent characteristics.

Very occasionally a CAD drawing might mimic a photo by being drawn from the software's simulated 'perfect' camera, but in the vast majority of cases, drawings cannot be treated like photographs.

CAD files can be imported into PhotoModeler to be used as known 3D information (Import / Control Points) but you can not convert a 2D drawing and use as a photo in PhotoModeler.