Visualization of Data Subject to Positive Constraints

In this paper, first free parameters are constrained in the description of rational cubic function (6) to preserve the shape of data that lies above the straight line. Then, rational cubic function is extended to rational bicubic partially blended function (Coons patches). A local positivity preserving scheme is developed for positive data by making constraints on free parameters in the description of rational bicubic partially blended patches. We also develop at the end the constraints for visualizing a data that lie above the plane.

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