MaskLayer

MaskLayer is a serializable struct that simplifies selecting a single Unity layer in the Inspector.

Overview

Unity's LayerMask supports multiple selections, but sometimes only one layer should be selectable. MaskLayer enforces a single layer and integrates with the Unity Editor for clean selection.

Features

• Single layer selection
• Unity Editor integration with custom property drawer
• Implicitly returns layer index and bitmask

Code Example

[SerializeField] private MaskLayer maskLayer;

int layerIndex = maskLayer.layerIndex;
int layerMask = maskLayer.LayerMask;

Members

Fields

• private int _layerIndex — stores the selected layer index.

Properties

• int layerIndex — returns the selected layer index.
• int LayerMask — returns 1 << layerIndex.

Methods

• void SetLayer(int layer) — sets the layer if the index is between 1 and 31.
• MaskLayer(int layer) — constructor with validation.

Editor Integration

A CustomPropertyDrawer is provided for Unity Editor that renders a dropdown layer field in the inspector.