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Difficult for users to exchange filters, since each user ran their own server.
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Difficult for users to run the Isosurface routine.
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Slow performance for 3D graphics.
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Collaborations with many users would often kill the system.
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We wanted an easy way to incorporate "state-of-the-art" visualization routines (like Stanford's Volpack routines for raytracing, or VTK routines).
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Needed a methodology for creating "maps" of filters, so users could invoke them from C/Fortran/Java.
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Operates on the premise of shared inputs.
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