Hi everyone, I am reading several papers focused on terrain rendering. In the ROAM algorithm article, I do not understand error metric used in section 6. What is zT(x,y)? I read it is the height map projected to the screen, but they find wedgies in a preprocess step...so what does it mean? What is the maximum distortion exactly? I am really frustrated with this part.. Thank you so much! [Edited by - Nene on March 18, 2007 9:10:38 AM]

Having not read anything about ROAM for awhile (it's not really optimal for today's hardware - I'd recommend clip mapping or somesuch) I can't say for sure what it is, but generally speaking when you're dealing with error metrics for rendering stuff, you want to measure the actual visual error you're introducing in screen space. In other words, what's the maximum error that the user will actually see given the current view.

Not sure if that helps any...