free form

n.

自由形态；

Free-form deformation of solid geometric models
Free-form deformation of solid geometric models
Free-Form Deformation of Solid Geometric Models T h o m a s W . Sederberg
Extended free-form deformation: a sculpturing tool for 3D geometric modeling
Direct manipulation of free-form deformations
Distilling Free-Form Natural Laws from Experimental Data
Direct manipulation of free-form deformations
Distilling free-form natural laws from experimental data.
A Survey Of Free-Form Object Representation and Recognition Techniques
Fast free-form deformation using graphics processing units