Bertram, MartinReis, GerdLengen, Rolf H. vanKöhn, SaschaHagen, HansKen Brodlie and David Duke and Ken Joy2014-01-312014-01-3120053-905673-19-31727-5296https://doi.org/10.2312/VisSym/EuroVis05/199-206We present a new algorithm extracting and fairing surfaces from segmented volumes composed of multiple materials. In a first pass, the material boundaries in the volume are smoothed considering signed distance functions for the individual materials. Second, we apply a marching-cubes-like contouring method providing initial meshes defining material boundaries. Non-manifold features emerge along lines where more than two materials encounter. Finally, the mesh geometry is relaxed in a constrained fairing process. We use our algorithm to construct a heart model from segmented time-varying magnetic resonance images. Information concerning the heart ontology is used to merge certain structures to functional units.Categories and Subject Descriptors (according to ACM CCS):G.1.2 [Numerical Analysis]: Approximation of surfaces and contours I.3.5 [Computer Graphics]: Curve, surface, solid, and object representations