globally,
a mesh is a drawcall
a mesh texture is a drawcall. 1 mesh and 1 texture = 2 drawcalls. 1 mesh + 2 textures = 3 drawcalls
a colision included into a mesh isn’t a drawcall. an colision taken outside the mesh is
to avoid drawcalls you need to go modular. as the engine has the particularity to batch all same meshes that use the same material instance into one drawcall. This is why you see all the marketplace stuff is modular stuff