Updatenormals doesn't affect the vertices. It just affect the lighting.
You can affect vertices by getting the surface via countsurfaces() and getsurface(). You then have to get the vertex-index of the vertice to affect with countvertices(). you can't move vertices, you will have to create a new surface by creating new vertices and free the old ones. You can get a vertex-position with VertexX, VertexY and vertexZ.
But all in all it is no good idea to try to make the tiles seamless by manipulating the mesh. Better make Tiles that fit together, that will limitate you much, but that's a problem you will ever have when using tiled environments.
Raitsun
You can affect vertices by getting the surface via countsurfaces() and getsurface(). You then have to get the vertex-index of the vertice to affect with countvertices(). you can't move vertices, you will have to create a new surface by creating new vertices and free the old ones. You can get a vertex-position with VertexX, VertexY and vertexZ.
But all in all it is no good idea to try to make the tiles seamless by manipulating the mesh. Better make Tiles that fit together, that will limitate you much, but that's a problem you will ever have when using tiled environments.
Raitsun