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Virtual Dictionary

Texel

A texel is the smallest element in a texture. It is not quite akin to a pixel, as used on the graphic files that make up textures. This is because, whilst a pixel is the smallest square possible on a picture, a pixel when applied as a texture, may be stretched or squished in any number of ways.

Instead of a pixel, a texel (texture Element) is used with texture mapping. A texel may represent one pixel, or it may represent the result of two pixels squashed together, or a quarter of a pixel that has been doubled in size.

The number of texels in an image changes with distance, as an image moves further away, the pixels squash together, and fewer texels are needed to represent them ? resulting in faster rendering times. As a texture comes closer to the viewer, the number of texels per pixel swiftly passes a !:1 ratio, with increasing numbers of texels being used for each pixel, allowing anti-aliasing and other techniques to be used to keep the view realistic.

By splitting and contracting pixels to texels when the texture is dynamically resized, the ability to create realistic blending and filtering effects is retained, even as the original picture would have been reduced to a blocky mess.

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Bilinear Filtering

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