Does maptiler support DEM *.tif images?
I was generating terrain tiles via cesium-terrain-builder but I wonder can I use
DEM files available in .tif format are considered as simple raster files by all GIS applications. When GIS applications specifically require only DEM files, then they need to check that the .tif files are single band rasters.
You can definitely use maptiler to generate tiles of DEM files.
I recommend you to use GeoserverTerrainProvider.js along with geoserver to serve the terrain tiles in Cesium for 3D rendering.