Summary:
Wesche et al. created a 3D sketching tool where the skeleton of a model is created. A user can draw curves in a virtual space. A new curve can be drawn anywhere, but additional curves must be merged with the present model. Altering curves can be done on a local or global scale. Surfaces can be filled in at closed curve loops. Surfaces can also be smoothed.
Discussion:
This paper had some nice pictures, but very little material was actually presented. How does the computer know where the pen point is? How does the user interact with the pen? Range of motion? Gestures?
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2 comments:
Don't ask such silly questions, Aaron. Leave these trivial details to the professionals. Here, look at some pretty pictures. These aren't the results you're looking for. Move along.
There are systems such as microscribe, which directly deliver you the stylus position in space, look for "3d digitizer". Those are often used in CAD anyway, so i think the paper is totally up to point.
Otherwise, you can set up a rig of stylus and offset 3 or more balls or leds, film it by 2 or more cameras, and calculate the stylus position back from the positions of those markers. For details see the book "Multiple View Geometry in Computer Vision" by Hartley & Zisserman, ISBN 0521540518
That's all standard stuff when considering scientific work.
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