Mip-Mapping Bias offsets the Mip-Map level from which a texture is sampled. Negative values indicate a larger Mip-Map level (bigger texture); a positive value indicates a smaller Mip-Map level (smaller texture). This is evident at the top of the images below:

Diagram showing Mip-Mapping process


The example below shows the effect on a render when increasing the Mip-Mapping bias:

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