Drag to orbit, right-drag or two fingers to pan, wheel to zoom. WASD / arrows move, Q/E down/up,
Shift is faster. Click the ground for the grid cell. "Both sides" draws back faces too; off is what the game
does, so a hollow building shows as see-through, as in game. Albedo textures only: no normal maps, no terrain,
walls that blend layers in game show their base layer.