com.jme3.math.Triangle generates a center vector and a normal vector and caches them. However, altering the triangle's vertices (using set(int,Vector3f), set(int, float, float, float), set1(Vector3f), set2(Vector3f), set3(Vector3f) or set(Vector3f, Vector3f, Vector3f)) does not update or invalidate the cached vectors. As a consequence, getCenter() and getNormal() may return incorrect values.