Sorry,for the delay. I solved mine the day before yesterday.
The problem on my side is: When I migrated those landscape from the original 4.19 project to 4.20 project, parameters(for sm5) are lost for those material instances. the hlsltranslator finds no params for it to generate sampler code. so no texture is sampled and those landscapes are black.
The difficulty which took me so much time is: I don’t know how to generate them. They were handled during the editing proccess, I got stocked.
And finally I just took a wild guess “may be I make an new instance of the broken material on sm5 shall force the editor to generate those params for me”. It worked. WTF!
