How to make a sphere by subdividing a Icosahedron and "eggifying" it.
GMT (Generic Mapping Tools) shell scripts building 3D perspective relief models of the Kuril-Kamchatka Trench: grdview topographic/bathymetric meshes from ETOPO relief overlaid on 2D EGM96 geoid contours, rendered at two perspective azimuths (135 and 165 degrees).
Over 30 GMT (Generic Mapping Tools) shell scripts building 3D perspective relief models: grdview-rendered topographic and bathymetric meshes and surfaces from ETOPO/GEBCO grids at set azimuth and elevation, often overlaid on 2D geoid contours, for ocean trenches, seas and countries.
GMT (Generic Mapping Tools) shell scripts rendering 3D bar histograms of bathymetric depth values: relief grids converted to XYZ (grd2xyz) and drawn as perspective 3D columns with psxyz to show the spatial depth distribution of ocean trenches.
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