Principles of interactive computer graphics (2nd ed.)
Principles of interactive computer graphics (2nd ed.)
Free-form deformation of solid geometric models
SIGGRAPH '86 Proceedings of the 13th annual conference on Computer graphics and interactive techniques
Direct manipulation techniques for 3D objects using 2D locator devices
I3D '86 Proceedings of the 1986 workshop on Interactive 3D graphics
Skitters and jacks: interactive 3D positioning tools
I3D '86 Proceedings of the 1986 workshop on Interactive 3D graphics
User interfaces for three-dimensional geometric modelling
I3D '86 Proceedings of the 1986 workshop on Interactive 3D graphics
Winged edge polyhedron representation.
Winged edge polyhedron representation.
DesignSpace: a manual interaction environment for computer aided design
CHI '94 Conference Companion on Human Factors in Computing Systems
DesignSpace: a manual interaction environment for computer-aided design
CHI '94 Conference Companion on Human Factors in Computing Systems
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Today, most solid modeling systems are used only in the final stages of design, where iterations are driven by analysis rather than creative exploration of alternative solutions. These systems have complex interfaces, slow response, and do not provide a convenient way of specifying a three dimensional position using a two dimensional display screen. As such they are not viable alternatives to visualization methods traditionally used in early design.This paper presents a geometric modeling system which incorporates a new concept for intuitively and unambiguously specifying and manipulating points or features in three dimensional space. The central concept, the Cutplane, consists of a plane that moves through space under control of a mouse or similar input device. The intersection of the plane and any object is highlighted, and only this highlighted section can be selected for manipulation. Selection is accomplished with a crosshair that is constrained to remain within the plane, so that the relationship between the crosshair and the feature of interest is immediately evident. Although the idea of a section view is not new, previously it has been used as a way to reveal hidden structure, not as a means of manipulating objects or indicating spatial position, as is proposed here.