path tracer, 3d grass, sky reflection on shading areas, issues!

Hey apisan, for the first image , is it a different geometry? was the original imported from another DCC? with what plugin? Sorry lots of questions but I can’t repro :frowning: with a simple TM file. It would be worthed to report a bug and share your file if possible. For the blue reflection, is it HDRI environment from TM library , if so , which one ?

Cheers