All of this makes it very fast to create surprising complex and realistic models. The software also can impose constrains such as parallelism and even snap complete models to a different part of the photo. As the outline is swept down the object it automatically adjusts its size to fit. If you have used image editing software you will probably already know about magic selection tools that automatically follow edges that you identify. Next a path is drawn on the photo which sweeps the cross sectional shape down the object to create a 3D model. The trick to making it easy is that the draw shapes snap to outlines in the photo.
The main restriction is that the objects are symmetrical in cross section.ģ-Sweep allows a human to draw cross sectional shapes - an ellipse say, that defines two dimensions of the object. You might think that this is restrictive, but by varying the size of the shape you can create complex objects. obtained by sweeping a 2D shape along a 3D line. You could do this if the objects you recognized in the photo were true 3D models.ģ-Sweep is a new approach to the problem that makes use of human intelligence with a little clever image processing to build 3D models that you can then edit within the photo in much more sophisticated ways than the 2D approach allows.ģ-Sweep makes use of the observation that most 3D objects are extrusions - i.e. You can do easy things like painting over objects with a background texture or removing parts of objects, but what you can't do is turn an object around, so that it faces another direction, or move the object within the scene. You might see the photo as a 3D scene but the editing tools work with the 2D patches of color that make up the photo. If you have tried your hand at photo editing, you will know that it is an essentially 2D process. You draw a few simple shapes which automatically snap to the object outlines in the photo, drag a few things and you have a complete, textured model that you can manipulate within the photo.
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