Linear Interpolation between Maps

If doing trilinear blending, we compute two texel values:

i = floor (?)

Ti is texel from mipmap with LOD = i

Tj is texel from mipmap with LOD = i+1

Final blended texel Tf value is:

Tf = (1- frac(?)) * Ti + frac(?) * Tj

Recall that the calculation of Ti, Tj is a weighted average of four pixel values:

(1-a)(1-b)T00 + a(1- b) T10 + (1-a)b T01 + ab T11

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