By removing the Fresnel term (often ommitted from fabric/cloth BRDFs) we can store the DG term for the cloth BRDF in the 3rd channel of the existing DFG LUT.
By removing the Fresnel term (often ommitted from fabric/cloth BRDFs) we can store the DG term for the cloth BRDF in the 3rd channel of the existing DFG LUT.