Apparently, the dancing tree phenomena is known since 2014, as a problem with the "Wind Tree" vertex program under DX9.
https://bitbucket.org/ryzom/ryzomcore/issues/160/wind-tree-vp-not -working-correcly-under
The workaround up to now was to use OpenGL instead - but now this bug seems to break OpenGL altogether for GTX 1080...
https://bitbucket.org/ryzom/ryzomcore/issues/160/wind-tree-vp-not -working-correcly-under
The workaround up to now was to use OpenGL instead - but now this bug seems to break OpenGL altogether for GTX 1080...