Final answer:
Bilinear filtering averages the colors of the nearest texels for smooth transitions, trilinear filtering interpolates between mipmap levels for better detail, and anisotropic filtering adjusts sampling based on viewing angle for sharp textures at various angles and distances.
Step-by-step explanation:
Bilinear filtering, trilinear filtering, and anisotropic filtering are all texture filtering techniques used in computer graphics to improve the appearance of textures on 3D models, particularly when they are viewed at oblique angles or from a distance.
Bilinear filtering is the most basic form of texture filtering. It works by averaging the colors of the nearest four texels (texture pixels) to the desired pixel on a texture, resulting in smoother transitions between texels. However, it may produce blurring effects, especially at steep angles.
Trilinear filtering goes a step further by considering two mipmap levels (scaled-down textures) and linearly interpolating between them in addition to interpolating between texels. This helps to reduce the blurring effect seen in bilinear filtering and provides a better level of detail at various distances.
Anisotropic filtering is the most advanced technique among the three. It differs from the other two by taking into account the angle at which the texture is being viewed. It can sample the texture more times in the direction where there is more stretching, typically resulting in textures that retain detail and sharpness over a range of distances and viewing angles.