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    Magicsphere: an insight tool for 3D data visualization
    (Blackwell Science Ltd and the Eurographics Association, 1994) Cignoni, P.; Montani, C.; Scopigno, R.
    How to render very complex datasets, and yet maintain interactive response times, is a hot topic in computer graphics. The MagicSphere idea originated as a solution to this problem, but its potential goes much further than this original scope. In fact, it has been designed as a very generical 3D widget: it defines a spherical volume of interest in the dataset modeling space. Then, several filters can be associated with the Magicsphere, which apply different visualization modalities to the data contained in the volume of interest. The visualization of multi-resolution datasets is selected here as a case study and an ad hoc filter has been designed, the MultiRes filter. Some results of a prototipal implementation are presented and discussed.
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    The Design and Specification of a Visual Language: An Example for Customising Geographic Information Systems Functionalities
    (Blackwell Science Ltd and the Eurographics Association, 1994) Paterna , F.; Campari, I.; Scopigno, R.
    In this paper the design of a visual program editor and its specification using formal grammars are discussed. We consider an environment to specify, analyse and execute visual programs for a Geographical Information System (GIS). The lack of sophisticated user interfaces is one of the major drawbacks to Geographical Information Systems, particularly for people without a sound background in computer science. The use of a visual language approach is useful in order to hide the plethora of basic GIS functions, while providing ready- to-use tools to solve users tasks. The visual environment provides users with higher level interfaces- it is based on the module concept, which is conceived as a software building block that implements a solution to a general basic task and is presented to the user through an interactive frame. Complex GIS queries can be carried out by interconnecting modules into flow networks, using a direct manipulation approach.