Fix bug http://github.com/mmp/pbrt-v2/issues/#issue/3 When clamping octaves in Turbulence(), need to add in term to account for the non-zero average value of the fabsf(Noise()) function for the unincluded octaves.
Fix bug http://github.com/mmp/pbrt-v2/issues/#issue/3
When clamping octaves in Turbulence(), need to add in term to
account for the non-zero average value of the fabsf(Noise())
function for the unincluded octaves.

patwonder/pbrt-v2-skin,patwonder/pbrt-v2-skin,patwonder/pbrt-v2-skin,patwonder/pbrt-v2-skin,patwonder/pbrt-v2-skin