Abstract
Sketching is a common way to depict design ideas freely. Augmented reality technology extends the human–computer interaction space from the screen to the real world, providing a new application space for 3D sketching. However, due to the difficulty of depth perception, it is difficult for sketching strokes to maintain good planar and spatial consistency, making drawing 3D sketches in AR challenging. In this article, we propose FMASketch—a method of drawing mid-air sketches similar to building blocks. The auxiliary surfaces can ensure that the strokes drawn by users can always stay on the same plane as drawing in 2D space. Gestures are used to stitch together multiple drawing planes, and the strokes on the planes form a 3D sketch, which is very similar to how 3D modeling is done on the desktop by drawing different views and assembling them. Experiments have verified the effectiveness of the auxiliary surface generation method and gesture operations in this article. The mid-air sketching method is easy to learn and provides a new idea for rapid modeling in AR scenarios.
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