On Sep 11, 2011, at 10:30 AM, Adam Dershowitz, Ph.D., P.E. wrote:
> Is there any easy way to show a prior route in Flightgear? In other words, > if I have a set of recorded GPS points (lat,long, alt) in a text file can I > display them in 3-D space, as I am flying in flightgear? Ideally I would > like points (some box or sphere icon?) connected with line segments. > There are three different approaches that occur to me, so I figured I would > check if anyone has done anything like this, and see if anyone can offer any > guidance. > 1) It is probably possible to generate some custom scenery that has my > desired path as custom made objects. But this seems like it is likely the > most difficult approach? > > 2) It seems likely that it could be done with nasal, but I have really not > done any nasal coding. One approach might be to hard code a bunch of > objects, representing points, in the right locations into a nasal file. This > is not very flexible, as each nasal script would be for a given single path. > > 3) Finally, what seems most general would be to write some code in nasal > that can read in a csv file, and then to display objects in those locations. > Is this feasible? Can nasal import a csv file or other general file format > that could contain points? > > If any of you have any existing code, or suggestions, I would love to hear > it. > > Thanks, > > --Adam > > > I wrote some NASAL to accomplish this, and I thought that I would pass it back to the group, as there was some interest (Curt....), and I don't have commit access. To use this, put show_points.nas into data/Nasal. The 4 geometry files go into data/Models/geometry and finally data is read from a csv file put in fg-aircraft. I included a little sample file to show a few points. To turn this on do: --prop:/sim/rendering/LLpoints=1 (or change this in flight to turn it on an off) You can change the interpolated points, between the actual points, by doing: --prop:/sim/rendering/LLpointsInterp=50. By default there is effectively no interpolation, only the actual points are displayed. A value of 50 will put a point every 50 meters, in a straight line between the existing points. Finally, you can change the data file name (although not the path) with --prop:/sim/rendering/LLfile=latlong.csv (although this is the default value). The sample lat/long file will put a few points around SFO, just for demo purposes. I hope that this is helpful.
show_points.nas
Description: Binary data
37.6139,-122.3586,50 37.6140,-122.3670,75 37.6137,-122.3650,100 37.6175,-122.3678,200 37.6204,-122.3739,100
trackpoint.ac
Description: Binary data
trackpoint.xml
Description: XML document
volume.ac
Description: Binary data
volume.xml
Description: XML document
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