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it was about NDC conversion on Y axis. this should be properly calculated. I have to reflect it.


Summary: Make a 3d mesh exactly the size of your terrain. Then do a raytrace trough the mouse towards the terrain. This will give you the x and z coordinate of the tile. Now from the z coordinate you can calculate the y coordinate of the tile without elevation. Then you can use one of your links to calculate the tile at that position. Now some simple math ...

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