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Illumination is an important way to provide cues for spatial perception, and special lighting models are proposed to illuminate lines in 3D space. To achieve better spatial perception of streamlines, a new streamline illumination method is proposed in this paper, which is based on the fact that a streamline is a sample of a stream surface. In our method, a(More)
Animation sketching tools have been shown to make creating animations fast and easy, but editing an animation can make it more complex and harder to modify. To preserve simplicity and flexibility while editing animations, we explored the use of flexible grouping structure and multiple centers for rotation and scaling. We built a modified version of the(More)
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