A texel is a single-pixel within a texture map, which is an image that gets used (in whole or in part) as the image presented on a polygon's surface within a 3D rendered image. The process of mapping the appropriate texels to their corresponding points on a polygon is called texture mapping, which is a stage of the process of rendering a 3D image for display. Texture mapping is typically done prior to lighting the scene; however, in WebGL, lighting is performed as part of the texture mapping process.

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