Trace works right, checked already with drawline. Have only one terrain and a free Camera code that is attachet to a Dummy entity. No more entities. (it is a editor for deform a terrain that i want to do).

The Contact struct is ok too

CONTACT* c = ent_getvertex(my,NULL,dt_vertex_nr);
c.v = NULL;
vec_for_ent (c.x, my);

But no Problem, i can work only with unchunked Terrains. Thanks

EDIT: I see now in the Bugforum that there is a bug with ent_setvertex and chunked terrain....
ent_setvertex sometimes left 'gaps' in chunked terrain (fixed in 7.81.8)