started adding completion system

shaders/gdscript_assist/ddof.gd

@@ -0,0 +1,15 @@
+extends MeshInstance3D
+
+var DOF_LENGTH = 250;
+var COLLISION_MASK = 1;
+
+func _physics_process(_delta):
+	var end = global_position - global_transform.basis.z * DOF_LENGTH
+
+	var rayParams = PhysicsRayQueryParameters3D.create(global_position, end, COLLISION_MASK)
+	var ray = get_world_3d().direct_space_state.intersect_ray(rayParams)
+	if !ray.is_empty():
+		end = ray["position"]
+	
+	var sm = get_active_material(0) as ShaderMaterial
+	sm.set_shader_parameter("ray_position", end)