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LSL Wiki : mask

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A mask is another term for a bitfield used to only retrieve specific values from another bitfield.

If there is a bitfield 01010101 but only the middle 4 bits are desired, bitwise AND (&) it with the mask 00111100. This works because anything ANDed with a 0 is 0, and anything ANDed with a 1 remains unchanged, allowing the unwanted bits to be stripped.

A mask is also another name for a texture that has transparency--a masked texture.

bitwise | bitflags | texture
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