Depth bias

From DmWiki

Depth bias is a small numeric factor that is added or subtracted from the real depth value. For example if you had a 3D virtual crate, and a 3D sign that you wanted to render on the side of the crate: the sign would have to be really close to the crate's surface, they would literally be at the same depth, so when you render them, the sign may appear behind the crate and not be seen because of floating point precision errors. SO to fix this situation you can give the crate a depth bias of 0, and the sign a depth bias of 1, so if their real depth location turns out to be similar, then the item with the higher bias will be rendered first.

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