It fixes the issue in this thread : http://hub.jmonkeyengine.org/forum/topic/normalmapslighting-issue/ Next step is to split vertices that have triangles with heavily rotated tangent spaces. git-svn-id: https://jmonkeyengine.googlecode.com/svn/trunk@10698 75d07b2b-3a1a-0410-a2c5-0572b91ccdca