A form of a bounding box where the box is aligned to the axis therefore only two points in space are needed to define it. AABB's are much faster to use, and take up less memory, but are very limited in the sense that they can only be aligned to the axis.
When viewing a texture up close the texture becomes very aliased and ugly (for an example, in Doom get as close to a wall as possible). Bilinear Interpolation is the process of smoothing out the texture so that it is blurred and looks more smoothed when viewed up close.
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