Only calculate inverse transform

objects/Grid.cs

@@ -72,21 +72,20 @@ public partial class Grid : Area3D
 	/// </summary>
 	public Transform3D Snap(Transform3D transform, Vector3 normal, Item item)
 	{
-		var inverseTransform = GlobalTransform.AffineInverse();
-		var inverseBasis     = GlobalBasis.Inverse();
 		var halfSize = (Vector3)item.Size * StepSize / 2;
 
 		// Get grid-local values of the global transform and normal.
-		var pos    = inverseTransform * transform.Origin;
+		var inverse = GlobalTransform.AffineInverse();
-		var basis  = inverseBasis     * transform.Basis;
+		var pos     = inverse       * transform.Origin;
-		    normal = inverseBasis     * normal;
+		var basis   = inverse.Basis * transform.Basis;
+		    normal  = inverse.Basis * normal;
 
 		// Snap rotation to nearest axis.
 		basis = Basis.FromEuler(basis.GetEuler().Snapped(Tau / 4));
 
 		// Offset / "push out" by half of the item's size.
-		var offsetAxis = (int)(normal * basis).Abs().MaxAxisIndex();
+		var axis = (normal * basis).Abs().MaxAxisIndex();
-		pos += halfSize[offsetAxis] * normal;
+		pos += halfSize[(int)axis] * normal;
 
 		// Snap the position to the grid.
 		var halfOff = basis * halfSize.PosMod(1.0f);