In CAGD and CG,energy model is often used to control the curves and surfaces shape.In curve/surface modeling,we can get fair curve/surface by minimizing the energy of curve/surface.However,our research indicates that in some cases we can't get fair curves/surface using the current energy model.So an improved energy model is presented in this paper.Examples are also included to show that fair curves can be obtained using the improved energy model.
Point-based surface has been widely used in computer graphics for modeling,animation,visualization,simulation of liquid and so on.Furthermore,particle-based approach can distribute the surface sampling points and control its parameters according to the needs of the application.In this paper,we examine several kinds of algorithms presented over the last decades,with the main focus on particle sampling technologies for implicit surface.Therefore,we classify various algorithms into categories,describe main ideas behind each categories,and compare the advantages and shortcomings of the algorithms in each category.
