Added a new scene

scenes/player.gd

@@ -0,0 +1,16 @@
+extends RigidBody3D
+
+# Initially I used a CharacterBody3D, however, I wanted the player to bounce off
+# other objects in the environment and that would have required manual handling
+# of collisions. So that's why we're using a RigidBody3D instead.
+
+const ACCELLERATION = 5.0
+
+func _integrate_forces(state):
+	var input_dir = Vector3.ZERO
+	input_dir.x = Input.get_action_strength("ui_right") - Input.get_action_strength("ui_left")
+	input_dir.z = Input.get_action_strength("ui_down") - Input.get_action_strength("ui_up")
+	input_dir = input_dir.normalized()
+	
+	linear_velocity.x += input_dir.x * (ACCELLERATION * state.step)
+	linear_velocity.z += input_dir.z * (ACCELLERATION * state.step)