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"abstract": "This paper presents several strategies to\r\ninteractively explore 3D flow. Based on a fast\r\nilluminated streamlines algorithm, standard graphics\r\nhardware is sufficient to gain interactive rendering\r\nrates. Our approach does not require the user to\r\nhave any prior knowledge of flow features. After the\r\nstreamlines are computed in a short preprocessing\r\ntime, the user can interactively change appearance\r\nand density of the streamlines to further explore the\r\nflow. Most important flow features like velocity or\r\npressure not only can be mapped to all available\r\nstreamline appearance properties like streamline\r\nwidth, material, opacity, but also to streamline\r\ndensity. To improve spatial perception of the 3D\r\nflow we apply techniques based on animation, depth\r\ncueing, and halos along a streamline if it is crossed\r\nby another streamline in the foreground. Finally, we\r\nmake intense use of focus+context methods like magic\r\nvolumes, region of interest driven streamline\r\nplacing, and spotlights to solve the occlusion\r\n problem.",
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