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Single view sketch-based modelers like SKETCH and Teddy can be powerful tools, but sometimes their inferences are inadequate: in Teddy, for example, if one draws an animal shape, the centerline of the tail will always lie in a plane rather than being curved in 3D. In these cases, multiple-view sketching seems like a reasonable solution: a single sketch gets viewed from a new direction, in which further sketching modifies the shape in a way that’s consistent with the original sketch. This paper describes a testbed implementation of such a multi-view sketching approach, based on epipolar lines, which is used for multi-view editing of the “backbone” lines for generalized cylinders. Multi-view sketching: the user perspective, These simple observations about epipolar geometry above lead us to an interface for 3D curve sketching, where a user is given epipolar lines as a guide for modifying the curve from a different point of view (see figure 2). We added this interface to our previous system [KHR02] for drawing free-form animals, and found it to be particularly useful for creating a variety of animal tails and other objects whose shape can be represented by generalized cylinders. The Bishop framing along the curve. The blue and green lines are the two vectors of the Bishop frame; the red lines are in the direction of the tangent vectors. Notice that the Bishop frame is continuous even at the inflection between the two bends. Simple geometry editing,Discussion and future work.
Tags : testbed implementation, tangent vectors, different point of view, curve sketching, animal shape, animal tails, reasonable solution, inflection, modelers, powerful tools, inferences, new direction, centerline, bends, sketch
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