diff --git a/project.godot b/project.godot
index 32fa79f..686b0af 100644
--- a/project.godot
+++ b/project.godot
@@ -9,17 +9,17 @@
 config_version=4
 
 _global_script_classes=[ {
-"base": "Reference",
+"base": "Node",
 "class": "ClickableComponent",
 "language": "GDScript",
 "path": "res://components/ClickableComponent.gd"
 }, {
-"base": "Reference",
+"base": "KinematicBody2D",
 "class": "CollisionLine",
 "language": "GDScript",
 "path": "res://utils/CollisionLine.gd"
 }, {
-"base": "Reference",
+"base": "Node",
 "class": "ColorComponent",
 "language": "GDScript",
 "path": "res://components/ColorComponent.gd"
@@ -54,7 +54,7 @@ _global_script_classes=[ {
 "language": "GDScript",
 "path": "res://utils/SpringDamper.gd"
 }, {
-"base": "Reference",
+"base": "Sprite",
 "class": "TintedSpriteComponent",
 "language": "GDScript",
 "path": "res://components/TintedSpriteComponent.gd"
diff --git a/scenes/AdaptiveWorldStream.gd b/scenes/AdaptiveWorldStream.gd
index f6245b9..191c3e4 100644
--- a/scenes/AdaptiveWorldStream.gd
+++ b/scenes/AdaptiveWorldStream.gd
@@ -29,7 +29,9 @@ var stream_world_rect = Rect2()
 
 
 func _ready():
+	world.heightmap.lock()
 	update_streaming_tiles()
+	
 
 
 func update_streaming_tiles():
@@ -46,20 +48,28 @@ func update_streaming_tiles():
 	
 #	print ("update_streaming_tiles: cells: ", top_left_cell.offset_coords, " to ", bottom_right_cell.offset_coords)
 	
-	world.heightmap.lock()
 
+#	for tile_3d in stream_active_tiles.get_children():
+
+#		var height = world.get_height(tile_3d.game_tile.offset_coords)
+#		tile_3d.transform.origin.y = height
+
+		
 	for cell_x in range (top_left_cell.offset_coords.x, bottom_right_cell.offset_coords.x + 1):
 		for cell_y in range  (bottom_right_cell.offset_coords.y, top_left_cell.offset_coords.y + 1):
 			if cell_x < 0 || cell_x >= world.size || cell_y < 0 || cell_y >= world.size:
 				continue
 
-			var tile_3d = stream_container.create_hextile3d_at(Vector2(cell_x, cell_y))
-			var hex_center = hexgrid.get_hex_center_from_offset(Vector2(cell_x, cell_y))
-			var height = world.get_height(Vector2(cell_x, cell_y))
-			tile_3d.transform.origin = Vector3(hex_center.x, height, hex_center.y)
-	
-	world.heightmap.unlock()
-	
+			var tile_3d = stream_container.create_hextile3d_at(Vector2(cell_x, cell_y))		
+			if tile_3d.transform.origin.y == -9999:
+				var hex_center = hexgrid.get_hex_center(tile_3d.game_tile)
+				var height = world.get_height(Vector2(cell_x, cell_y))
+				if height < 0:
+					tile_3d.set_tiletype(GameTile.TileType.Sand)
+				else:
+					tile_3d.set_tiletype(GameTile.TileType.Grass)
+				tile_3d.transform.origin = Vector3(hex_center.x, height, hex_center.y)
+
 	num_tiles_label.text = str(len(stream_container.tiles_by_offset_coord.values()))
 	num_active_tiles_label.text = str(stream_active_tiles.get_child_count())
 
@@ -70,10 +80,10 @@ func _process(_delta):
 	var player_coord = player.transform.origin
 	current_tile = hexgrid.get_hex_at(Vector2(player_coord.x, player_coord.z))
 	
-	world.heightmap.lock()
+#	world.heightmap.lock()
 	player.transform.origin.y = world.get_height(current_tile.offset_coords)
 	player.transform.origin.y = 2.0
-	world.heightmap.unlock()
+#	world.heightmap.unlock()
 	
 	var player_hex_offset_coord = current_tile.offset_coords
 	tile_label.text = "%d, %d" % [player_hex_offset_coord.x, player_hex_offset_coord.y]
diff --git a/scenes/AdaptiveWorldStream.tscn b/scenes/AdaptiveWorldStream.tscn
index 5264b5d..39f5afe 100644
--- a/scenes/AdaptiveWorldStream.tscn
+++ b/scenes/AdaptiveWorldStream.tscn
@@ -127,12 +127,13 @@ text = "0"
 
 [node name="StreamContainer" type="Spatial" parent="."]
 script = ExtResource( 4 )
-world_rect = Rect2( 0, 0, 25, 20 )
+world_rect = Rect2( 0, 0, 20, 20 )
 
 [node name="ActiveTiles" type="Spatial" parent="StreamContainer"]
 
 [node name="Bounds" type="MeshInstance" parent="StreamContainer"]
 transform = Transform( 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, -1, 0 )
+visible = false
 mesh = SubResource( 1 )
 skeleton = NodePath("../..")
 material/0 = SubResource( 2 )
diff --git a/scenes/StreamContainer.gd b/scenes/StreamContainer.gd
index c47e5ca..c895ed2 100644
--- a/scenes/StreamContainer.gd
+++ b/scenes/StreamContainer.gd
@@ -26,11 +26,20 @@ func is_hex_coord_in_rect (coord: Vector2):
 	return coord.x >= offset_coord_rect.position.x and coord.x < offset_coord_rect.end.x and coord.y >= offset_coord_rect.position.y and coord.y < offset_coord_rect.end.y
 
 
+func instantiate_hextile3d():
+	return hextile3d.instance()
+
+
+func add_hextile_to_tree(hextile3d):
+	active_tiles.add_child(hextile3d)
+
+
 func create_hextile3d_at (coord: Vector2) -> HexTile3D:
 	if not coord in tiles_by_offset_coord.keys():
-		var new_hextile3d = hextile3d.instance()
-		active_tiles.add_child(new_hextile3d)
+		var new_hextile3d = instantiate_hextile3d()
+		add_hextile_to_tree(new_hextile3d)
 		new_hextile3d.game_tile.offset_coords = coord
+		new_hextile3d.transform.origin.y = -9999
 		tiles_by_offset_coord[coord] = new_hextile3d
 	
 	return tiles_by_offset_coord[coord]
@@ -46,7 +55,7 @@ func cleanup_tiles():
 			child.queue_free()
 			active_tiles.remove_child(child)
 			num_deleted = num_deleted + 1
-	
+
 #	print ("deleted ", num_deleted, " tiles")
 
 
diff --git a/scenes/World.gd b/scenes/World.gd
index e753336..c59d282 100644
--- a/scenes/World.gd
+++ b/scenes/World.gd
@@ -27,7 +27,7 @@ func init_noisemap():
 	var noise_texture = NoiseTexture.new()
 	var noise_generator = OpenSimplexNoise.new()
 	
-	noise_generator.seed = randi()
+	noise_generator.seed =  -1626828106#randi()
 	print ("seed: ", noise_generator.seed)
 	noise_generator.octaves = 3
 	noise_generator.period = 5
@@ -41,5 +41,5 @@ func init_noisemap():
 
 
 func get_height(coord: Vector2) -> float:
-	return heightmap.get_pixel(coord.x, coord.y).r * 3
+	return heightmap.get_pixel(coord.x, coord.y).r * 3 - 1.5