View Dependent

Multiresolution Flow Texture Advection

Abstract

Publication

Existing texture advection techniques will produce unsatisfactory rendering results when there is a discrepency between the resolution of the ow eld and that of the output image. This is because many existing texture advection techniques such as Line Integral Convolution (LIC) are inheriently none view-dependent, that is, the resolutions of the output textures depends only on the resolution of the input eld, but not the resolution of the output image. When the resolution of the ow eld after projetion is much higher than the screen resolution, aliasing will happen unless the ow textures are appropriately ltered through some expensive post processing. On the other hand, When the resolution of the ow eld is much lower than the screen resolution, a blocky or blurred appearance will present in the rendering because the ow texture does not have enough samples. In this paper we present a

view-dependent multiresolutional ow texture advection method for structured recti- and curvi-linear meshes. Our algorithm is based on a novel intermediate representation of the ow eld, called trace slice, which allows us to compute the ow texture at a desired resolution interactively based on the run-time viewing parameters. As the user zooms in and out of the eld, the resolution of the resulting ow texture will adapt automatically so that enough ow details will be presented while aliasing is avoided. Our implementation utilizes mipmapping and programmable GPUs available on modern programmable graphics hardware.

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