floating rock island 3d model

A massive floating island terrain base mesh. Crucially, the top of the island is completely open and has no flat surface or lid, resembling a hollow rocky shell or an open volcano crater. The bottom of the island is a deep, inverted jagged rocky cone. Inside the island, there is a large, perfectly cubic hollow cavern. A side tunnel entrance is located high up on the outer cliff. This side tunnel is specifically a small, wide rectangle (width is strictly twice its height, 2:1 aspect ratio), about half the size of a standard cave. It is vital that both the wide open top and the small rectangular side tunnel fully pierce through the rock walls and connect directly into the central cubic cavern, creating a continuous, fully connected internal hollow space. Bare gray stone texture, solid rock, unpopulated, empty nature, no buildings, no trees, plain 3D game asset, open top mesh.