I have come across your 3D Viewer work for MapWindow, I am also trying to build similar project using DotSpatial Library.
I need your expert advice for same, just need pointers from you no solution/code on belwo requirments:
3D view of TIFF image/ shp file [ To support UTM coord system, LCC(WGS 84 datum), Polyconic(Everest datum)]
Inter visibility between two points(Line of sight)
Line of sight fan/ View shed analysis with colour code
Distance measurement tool between two points (highlighting shortest route with distance) in a shape file
Go to/ zoom in to a selected coordinate location
Thanking You. :)