Dynamic surfaces in GRASS
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started in 1991 by Dave Gerdes team at CERL
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influenced by the work done at NCSA, Univ. of Illinois
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based on Silicon Graphics GL and animation tools
GRASS implementation
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based on series of raster maps
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SG3d: surface visualization (SGI, NASA pannels GUI)
with keyframe animation and scripting
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Nviz: multiple surfaces (Motif , TclTk, GL, OpenGL) extended keyframe animation and scripting capabilities
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xganim: 2D animation of multiple time series