JibbSmart: Useful info. With your test ... please do!! All I really need
is functional code (both lite-c and FX) to get an object shader into a bmap...

JustSid: Finally found it, and a great example of bmap_process! Certainly goes into my archives.
BUT, it is 'just' a post-processing shader in this instance, and I cant currently
get to the height-data EXCEPT by creating a bmap and 'pixel-to-bmap'ing one together
and that will lose me all the speed Im trying to gain by this shader...

Hopefully Jibb may come up with something. Im about to try playing with the
target1..target3 pointers to see how I go...