...Vertex has dropped down to a probably not very good cache-friendly size - it is now 12 Bytes (and I plan in future to drop it down to just 2 Bytes for YPOS, since it`s a regular heightmap) for Stream 0 (each terrain chunk has a separate VB) and 12 Bytes for Stream 1 (just 1 single VB used with ALL 256 terrain chunks (each chunk being 128x128 vertices) ). Previous Vertex sizes were bigger,...

... may further optimize this by testing against the heightmap first to determine areas of possible intersection, ...by adjacent row and column entries in the heightmap array, and compare these against the four points...by triangles generated by these entries in the heightmap. * (Note: if the view could be from ... the elevation at that point in the heightmap) * If the ray intersects, use the closest ...