Fundamentals of interactive computer graphics
Fundamentals of interactive computer graphics
A scan line algorithm for displaying parametrically defined surfaces
SIGGRAPH '78 Proceedings of the 5th annual conference on Computer graphics and interactive techniques
SIGGRAPH '79 Proceedings of the 6th annual conference on Computer graphics and interactive techniques
A Method for Solving the Visibility Problem
IEEE Computer Graphics and Applications
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An analytical method to determine the visible parts of parametrically defined tensor-product surfaces in described. All visibility calculations are strictly oriented on the (u, v)-parameter plane. This leads to substantial advantages over visibility algorithms based on the approximation of curved surfaces by sets of planar polygons. The new algorithm allows the calculation and the display of boundaries and contour curves with high precision in a minimal way. All critical points of a surface (contours, overlapping contours and penetrations) can be detected with machine precision. The results can be displayed both on vector and raster devices and are invariant under image transformations.