Trilinear filtering
Trilinear filtering or trilinear interpolation is an isotropic interpolation method that is used as a texture filter when rendering 3D computer graphics . Trilinear filtering is an extension of bilinear filtering with the aim of suppressing the effect of MIP banding . It therefore only makes sense to use them in conjunction with MIP mapping .
MIP banding is a discontinuity that occurs in bilinear filtered textures at the transition between two MIP levels ( level of detail ). It is clearly recognizable as a line on which the sharpness of the texture changes abruptly.
In order to avoid this effect, with trilinear filtering, two texture values that result from the interpolation of the neighboring MIP levels are always calculated and then linearly interpolated. The three-stage linear interpolation required for this gives the trilinear interpolation its name.