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I am trying to export 3d raster image prepared in ArcGIS to cfd package such as Fluent. I was wondering if anyone has experience to convert raster image to autocad 3d format, stl, vrml or any other format of its likes which could be imported to cfd package.

I could import format likes IGES, .stl, .DWG, .DXF or even text files.

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Just open the file in QGIS and use the STL plugin to save the data. As simple as opening the raster and then "Save As"

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