Yes i think denoiser kills the details on the grass.
Do you use denoise amount = 1? Depending on your noise level this (still) makes no sense to me, especially using 1.0 in scenes with a generally high visible noise (grass/foliage/irregular floor). It´s imho the only questionable Corona default value by now. It may be reasonable for low remaining noise levels like <2 but this is hard to achieve with a lot of foliage while aiming for short frame times.
So I would try to find a good working balance of noise level and denoise amount, e.g. render down to 4-5% noise and denoise with 0.6 to 0.8. If you are testing anyway, you may render a short sequence using 1.0 denoise amount + the CShading_Beauty render element with denoise 0 and mix them in post to find out when it´s enough.
Good Luck
Frood & PROH
I think I am going to quit denoiser.I will share the version that denoiser is not used ( 180 frame full hd ver. ) I will make a test 0,2 but ı think it is more reasoneble to use it with further camera angels.
