Ok so i have a small terrain 200x200 with water and soft shadows, like very VERY soft.
(this problem happens without water and shadows.)
and so look at the pics and you see the rise in draw calls with some simple small hills i make. why am i hitting 100 draw calls with every 1 meter bump i make?
The raise in drawcalls comes from the fact that the terrain must create smaller and smaller submeshes to handle the geometry required to render the surface you design.
the flatter → the lower the amount of triangles required to represent it.
the bumpier → the more triangles → the more meshes and thus drawcalls