SMDegrain Question

[bxyhxyh]

#source
Spline36Resize(1730, 936)
pre = last.fft3dfilter(sigma = 1.5, bw = 16, bh = 16, ow = 8, oh = 8, plane = 4).Gradfun3()
smdegrain(overlap = 4, blksize = 8, thsad = 200, thsadc = 180, lsb = false, pel = 2, refinemotion = true, contrasharp = true, chroma = true, truemotion = false, tr = 3, prefilter = pre, plane = 4)

What it could be in raw MDegrain3 code?

I just wanted to write raw MDegrain3's code of above, because SMDegrain has too much expressions which I wouldn't use and drag down encoding speed.