Preint08_1 - 1 1 What we will cover • Contour Tracking...

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Unformatted text preview: 1 1 What we will cover • Contour Tracking • Surface Rendering • Direct Volume Rendering • Isosurface Rendering • Optimizing DVR • Pre-Integrated DVR 2 Image Quality Depends on Sampling Rate OTF variance OTF*Sampling Rate Really nothing? 2 3 Ray-Integration Discrete approximation of volume rendering integral will converge against correct result 4 High-Frequency TFs High frequencies in the transfer function T increase required sampling rate x s T(s) x T(s(x)) s(x) 3 5 High-Frequency TFs 64 data slices 10 times more slices s T(s) 6 High-Frequency TFs 4 7 Idea: Pre-Integrated Classification – slab-by-slab rendering slice-by-slice slab-by-slab Pre-Integrated Volume Rendering 8 pre-integrate all possible combinations in the TF Pre-Integrated Classification s f s b store integral into table s f s b d front slice back slice Assume constant sampling distance d s b s f 5 9 s f s b project slice s f s b front slice back slice Pre-Integrated Volume Rendering 10 s f s b slice s f s b Pre-Integrated Volume Rendering fetch s f and s b during rasterization utilize s f and s b as texture coordinates for the dependent texture 6 11 Pre-integrated Transfer Function d d x s x s c D ' ))) ' ( ( exp ) ( ( ~ D Image Plane d...
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Preint08_1 - 1 1 What we will cover • Contour Tracking...

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