On Wed, 14 Jun 2006 10:14:18 -0400, bsupnik wrote in message <[EMAIL PROTECTED]>:
> Hi Y'all, > > One of the things that's come up in the apt.dat discussions is whether > the taxiway layouts should be "pre-clipped" (meaning there are no > overlapping polygons) or "overlapped" (meaning polygons can overlap > and there is a well-defined draw order that makes one appear on top > of another). > > (I think we have to pick one - having overlapping polygons with random > draw order doesn't help authors make layouts.) > > I'm looking for pros and cons of each technique...here's some thoughts > I've had: > > - I'm not sure about FG's scenery distro model, but pre-clipped > polygons means that more work has been done to a layout before it > becomes an apt.dat file, which would make on-the-fly loading of > add-on scenery faster. > > - Any app will have to do clipping or draw order control - clipping > can happen before or during app run. So a clipping model gives us a > chance to keep work out of sim-run-time, but an overlapped model > allows us to do work in the sim (e.g. avoid the need for > preprocessing). I think FG is pretty strongly in the preprocessing > camp right now. .."strong enough", or "too"? ;o) > - Pre-clipping puts more burdon on content creation tools (by > requiring them to have robust clipping to save the data) whereas not > requiring pre-clipping puts more work on data consumers. > > - Personally I like pre-clipping because I've always found overlapping > runway data to be..."messy". I always wonder if there isn't some > polygon buried under another one, totally invisible to the user. So I > tend to think pre-clipping makes a better editing environment. But > this last point is probably not appropos to the discussion. > > Thoughts? > Ben ..I don't like either way. My preference is let those home town patriots decide whether they wanna live with their ugly-as-sin VMAP0/apt.dat toxin dumps, or volonteer slick brlcad type 3d solid models to tweak in TaxiDraw, and generate apt.dat data from those. -- ..med vennlig hilsen = with Kind Regards from Arnt... ;o) ...with a number of polar bear hunters in his ancestry... Scenarios always come in sets of three: best case, worst case, and just in case. _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
