I have a high-resolution (42,678 x 21,340 pixel) digital elevation map (DEM) of Mars. My goal is to create an accurate image of Mars after terraforming (significant amounts of water introduced to form oceans).
I created a Sphere, added a Displace modifier, and used the high-resolution elevation map as the Bitmap parameter for Displace.
Then, I added a blue sphere at the same coordinates, the radius of which indicates the amount of flooding (ocean formation).
The resulting render is extremely blocky. The impression I have is that the Displace modifier created a fairly small number of polygons from the original sphere.
Is there a better approach? If not, how can I make this one work?