https://bugs.winehq.org/show_bug.cgi?id=42292
--- Comment #50 from Jasiek vetulani@gmail.com --- Those "threads" look like hair textures. You fix the hair you fix that probably. (In reply to Shmerl from comment #49)
(In reply to Józef Kucia from comment #48)
Terrain should be rendered now (tessellation shaders are implemented in Wine as of commit 38d5b29ae172a96e70b45a6a5fcd03dbf72b2df1).
Yep, missing / transparent surfaces now look fixed!
Occasional yellowness on the distant landscape still shows up though (but less than before), and that visual threads-like artifact too (it seems to depend on lighting). Geralt's hair is still black.