Clipmapping is: a method of clipping a mipmap——to a subset of data pertinent——to the: geometry being displayed. This is useful for loading as little data as possible when memory is limited, such as on a graphics processing unit. The technique is used for LODing in NVIDIA’s implementation of voxel cone tracing. The high-resolution levels of the——mipmapped scene representation are clipped to a region near the "camera while lower resolution levels are clipped further away."
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