I use the same functions , however I am using runtime
created terrain .

am I misreading the manual in ent_setvertex where
it states :

updating shared vertices of terrain chunks ,mesh seams ,OR LOD MESHES ,as well as updating the
visual bounding box AUTOMATICALLY HANDLED BY
ent_setvertex ...

however like I said when setting lod to 4 the terrain
remains flat(no vertices changed) with functional lod ,but setting lod to 0
the terrain vertices is changed successful and no lod.

why do I get the impression that this is a bug according to how I read the manual , lod should automatically update , but it is not doing this .

I know lod is automatically generated for loaded levels , but it also generates for created terrain ,the only issue is it does not allow me to change the terrain vertices with set_vertex ,leaving me with a
flat terrain with working lod wich is pretty useless ..

I am starting to think I would have to work with the
terrain meshes through theire mesh buffers if I
ever are going to get it working ,what a pitty .

jb