@ big10p: I'm not displaying these verts at all - I am just attempting a new explosion system -- have tried using types for it but they get too complex. Bit complicated to explain and I don't even know if it'll work or have any benefit yet! I like the idea of creative uses for one thing as another thing -- in this case using a mesh with verts but no tri's as information storage. Basically, it means I can check two pieces of information at the same time, hopefully saving a few millisecs.