This paper proposes a novel 3D direct interaction modelling system for manipulating voxel based objects using currently available 3D motion sensing input devices such as Microsoft Kinect. The guiding principle while developing the system was to imitate natural human modelling behaviour and provide a real life experience of 3D object manipulation, inspired by the techniques used in modelling clay. Properties of a functional prototype application are presented and software architecture of the created tool is analysed. Descriptions of newly developed algorithms are included, grouped into several categories. Visualization algorithms are used for defining properties and creating usable modelling mass from volumetric models. On the other hand, algorithms related to object recognition and human computer interaction include various techniques for depth segmentation, contour detection, finger recognition and virtual control with gestures.
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