While implicit surface or surface deformation is represented by multiple metaballs

bulge

crease and tearing frequently appear in overlap area. Researchers tried to tackle the defect by means of adjusting parameters of metaball

simple superposition and direct union. However

they failed to reach expectant result. By the study on single metaball influence and multiple metaball influence overlap

the authors present several blending methods for point

line segment and curve segment skeleton respectively. The multiple metaball influence overlap blending methods include linear weight blend

algebraic blend

and exponent average blend. These blending methods are independent from the expressions of surfaces and the field function formula of metaball. Case studies show that the effect and efficiency of the suggested methods are satisfied.