add collisions and player gravity

Scripts/Main.gd

@@ -3,7 +3,7 @@ extends Node3D
 
 func _ready():
 	add_child($Dungeon.generate_geometry())
-	var spawn = $Dungeon.get_spawn()
+	var spawn: SpaceSpawn.Desc = $Dungeon.get_spawn()
 	$Player.position = spawn.position
 	$Player.position.y += 0.5
 	$Player.rotation = spawn.rotation

Scripts/Player.gd

@@ -6,7 +6,8 @@ extends CharacterBody3D
 const VIEW_BOB_FREQUENCY = 8
 const VIEW_BOB_AMPLITUDE = 0.03
 
-var speed := 2
+var gravity := 20.0
+var speed := 2.0
 var turn_speed_sec := 0.1
 var turn_degrees := 90
 var view_bob_time := 0.0 # increased while velocity is not zero
@@ -55,8 +56,7 @@ func _process(delta: float) -> void:
 
 
 func _physics_process(delta: float) -> void:
-	# TODO
-	#velocity.y += gravity * delta
+	velocity.y -= gravity * delta
 	var final_velocity = _get_input() * speed
 
 	velocity.x = final_velocity.x

Scripts/Space/Space.gd

@@ -15,7 +15,7 @@ func generate_geometry() -> Node3D:
 
 	for child in get_children():
 		if child is SpaceRegion:
-			var geometry = child.generate_geometry(self)
+			var geometry: MeshInstance3D = child.generate_geometry(self)
 			root.add_child(geometry)
 
 	return root

Scripts/Space/SpaceRegion.gd

@@ -56,6 +56,7 @@ func _generate_geometry(space: Space, looked_from_inside: bool) -> Node3D:
 		if child is SpaceRegion:
 			geometry.add_child(child._generate_geometry(space, not looked_from_inside))
 
+	geometry.create_trimesh_collision()
 	return geometry