Topology-based Transfer Function Design

G.H. Weber and G. Scheuermann (Germany)

Keywords

volume rendering, transfer function design, topology based methods, data exploration

Abstract

Direct Volume Rendering (DVR) is commonly used to visualize scalar fields. Quality and significance of rendered images depend on the choice of an appropriate transfer function that assigns optical properties (e.g., color and opacity) to scalar values. We present a method that automatically generates a transfer function based on the topological behavior of a scalar field. We find a set of critical iso values for which the topology of an isosurface, i.e., a surface representing all locations where the scalar field assumes a certain value v, changes. Then we generate a transfer function that emphasizes scalar values around those critical isovalues. Images rendered using the resulting transfer function reveal the fundamental topological structure of a scalar data set.

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