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Higher Order Approximating Normals and Their Impact on Isosurface Shading Accuracy

Wood B. A., Lee J. K., Maskey M., Newman T. S.

Machine Graphics and Vision

2010

Vol. 19, No. 2

201-221

Two alternatives to the standard (central differencing) method for estimating normals of Marching Cubes isosurfaces are considered. The methods are based on higher order approximations of dataset gradients. Of primary concern here are the effects of these methods on rendering quality, which is evaluated here through pixel-by-pixel comparisons of typical-fidelity isosurfaces versus high-fidelity rendering achievable from analytically derived formulae. The evaluations also consider effects of noise on isosurface rendering quality for renderings based on standard versus higher order gradients.