Separate interable layer into pickup and place

objects/Item.cs

@@ -19,7 +19,7 @@ public partial class Item : RigidBody3D
 		}
 
 		// Set the collision properties here so we don't have to specify them in each item scene separately.
-		CollisionLayer = (uint)(PhysicsLayer.Item | PhysicsLayer.Interactable);
+		CollisionLayer = (uint)(PhysicsLayer.Item | PhysicsLayer.Pickup);
 		CollisionMask  = (uint)(PhysicsLayer.Static | PhysicsLayer.Dynamic | PhysicsLayer.Player | PhysicsLayer.Item);
 
 		Freeze = FindParent("Grid") != null;

objects/grid.tscn

@@ -3,7 +3,7 @@
 [ext_resource type="Script" path="res://objects/Grid.cs" id="1_7yhbt"]
 
 [node name="Grid" type="Area3D"]
-collision_layer = 256
+collision_layer = 512
 collision_mask = 0
 monitoring = false
 script = ExtResource("1_7yhbt")

player/PickupController.cs

@@ -94,7 +94,10 @@ public partial class PickupController : Node3D
 		}
 
 		if (HasItemsHeld) {
-			if ((RayToMouseCursor() is RayResult ray) && (ray.Collider is Grid grid)
+			// This ray will be blocked by static and dynamic objects.
+			const PhysicsLayer Mask = PhysicsLayer.Place | PhysicsLayer.Static | PhysicsLayer.Dynamic;
+
+			if ((RayToMouseCursor(Mask) is RayResult ray) && (ray.Collider is Grid grid)
 					// Make sure this is placed against the top of the grid.
 					&& CanPlaceAgainst(grid, ray.Normal)
 					// Ensure item is not being added to itself or nested items.
@@ -114,7 +117,7 @@ public partial class PickupController : Node3D
 				_grid = null;
 			}
 		} else {
-			var interactable = RayToMouseCursor()?.Collider;
+			var interactable = RayToMouseCursor(PhysicsLayer.Pickup)?.Collider;
 
 			// Remove the outline from the previously looked-at item.
 			if (CurrentItem != null) SetMeshLayerOutline(CurrentItem.Model, OutlineMode.Disable);
@@ -138,7 +141,7 @@ public partial class PickupController : Node3D
 		}
 	}
 
-	RayResult RayToMouseCursor()
+	RayResult RayToMouseCursor(PhysicsLayer collisionMask)
 	{
 		var camera = _player.Camera.Camera;
 		var mouse  = GetViewport().GetMousePosition();
@@ -146,7 +149,7 @@ public partial class PickupController : Node3D
 		var to     = from + camera.ProjectRayNormal(mouse) * PickupDistance;
 
 		var query = PhysicsRayQueryParameters3D.Create(from, to);
-		query.CollisionMask = (uint)PhysicsLayer.Interactable;
+		query.CollisionMask = (uint)collisionMask;
 		query.CollideWithAreas = true;
 		// Exclude the `CurrentItem` from collision checking if it's being held.
 		query.Exclude = HasItemsHeld ? [ CurrentItem.GetRid() ] : [];

project.godot

@@ -87,7 +87,8 @@ interact_place={
 3d_physics/layer_2="Dynamic"
 3d_physics/layer_3="Player"
 3d_physics/layer_4="Item"
-3d_physics/layer_9="Interactable"
+3d_physics/layer_9="Pickup"
+3d_physics/layer_10="Place"
 
 [rendering]
 

scripts/globals/PhysicsLayer.cs

@@ -1,8 +1,17 @@
 [Flags]
 public enum PhysicsLayer : uint {
-	Static       = 1 << 0,
-	Dynamic      = 1 << 1,
-	Player       = 1 << 2,
-	Item         = 1 << 3,
-	Interactable = 1 << 8,
+	/// <summary> Objects that are part of the scene, and never move. </summary>
+	Static  = 1 << 0,
+	/// <summary> Objects the player collides with, but may move. </summary>
+	Dynamic = 1 << 1,
+	/// <summary> The player. </summary>
+	Player  = 1 << 2,
+	/// <summary> Small objects the player doesn't collide with, but collide with the player. </summary>
+	Item    = 1 << 3,
+
+
+	/// <summary> Objects that may be picked up. </summary>
+	Pickup  = 1 << 8,
+	/// <summary> Objects that other objects may be placed against. </summary>
+	Place   = 1 << 9,
 }