We propose a new approach to easily creating 3 0 geometric models. A technique called interactive evolutionary computation (IEC) is introduced to accelerate user's invention and inspiration of new shapes. The proposed IEC-based design system generates aesthetically pleasing shapes through the simulation of natural evolutionary processes. The user only is required to specrfi hidher subjective preference of each shape generated by the IEC. The system allows even beginners with little knowledge and experiences of the 3 0 modeling to acquire innovative shapes. Because the system is developed based on a 3 0 geometric modeler using implicit surface method, it also provides skilled experts with an advanced modeling interface. The experts can directly modrfi the internal parameters of the 3 0 models to make them more elaborate ones. Some experimental results are presented to show the potential of the proposed modeling method.

1. ABSTRACT While many sophisticated 3D rendering methods are available to produce realistic output, 3D data input still is a tedious and time-consuming task. This paper proposes a new method for modeling 3D objects using hand gestures. First of all, a conceptual model, the so-called "image externalization loop" model, is introduced as a framework to realize an efficient 3D object creation environment. Then, a 3D shape forming method for implementing the model is described in detail. Two-handed spatial and pictographic gestures are used to describe the features of the object in shape, size and deformation pattern. The implicit superquadric functions apply to build a deformable 3D model with blending and axial deformations as their extensions. A generic hand gesture learning and recognition facility is developed and used to translate the gestures into specific superquadrics parameters to deform the object. Finally, some experimental results are shown to express the capability and usefulness of the proposed method with its potentia! application areas.

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