I have a UWP MapControl with a CustomMapTileDataSource to display very high resolution 2D images, not geographical data. I managed to provide my own tiles as described in https://learn.microsoft.com/en-us/windows/uwp/maps-and-location/overlay-tiled-images, including the steps of the section "Replace the default map".
I use the MapProjection WebMercator, but depending on the location and the zoom level, it deforms/bends the rendering as if we were looking at a sphere.
This is with a zoom level < 5:
This is with a zoom level >= 5:
Of course the other choice (Globe) is totally inadequate for my application. Instead I would need a very basic flat projection (no deformation). Is it possible?