This code performs a left bitwise shift operation. Specifically: - `1`...

This code performs a left bitwise shift operation. Specifically:

• 1 is the integer literal with a binary representation of 0000...0001 (depending on the bit-width of the system).
• Layers.Terrain is expected to be an integer value, typically representing a specific layer index.

The expression 1 << Layers.Terrain means the binary representation of 1 is shifted to the left by the value of Layers.Terrain positions. For example:

• If Layers.Terrain is 0, the result is 1 << 0 → 1 (binary: 0000...0001).
• If Layers.Terrain is 2, the result is 1 << 2 → 4 (binary: 0000...0100).
• If Layers.Terrain is 5, the result is 1 << 5 → 32 (binary: 0010...0000).

This operation is often used to set a specific bit in a binary number, commonly in contexts like working with bitmasks (e.g., marking certain layers or flags active). In this case, the resulting value enables the layer corresponding to Layers.Terrain in a bitmask.