Expose a polygon function that will split up long edge lines to keep the
max edge distance below some threshold. This could be used for instance
to reduce long lines in polygon area shapes so they can better follow
the underlying terrain changes.
The patches deal with three separate issues, all rolled up into one
tarball:
Currently, arrayfit always appends .arr.gz onto the name passed on the
command line, meaning that only tile names can be passed. The patch strips
off .arr or .arr.gz if present prior to it's appending, meaning that tile
names or filenames can be passed on the command line.
The interface to the OSGB36 conversion functions is cleaned up a lot. I
can't believe I originally wrote it in such an ugly manner!
A lot of console output (> 5000 lines per tile) is removed from the final
construction process, meaning that the output left can actually be read.
The attached patches significantly quieten the output from genapts, which in it's current form resembles the universe flying by on a bad hair day Remember chaps, console output on Windows is slooowwwwww... Normal service may be resumed using --verbose or -v. I've also added a short help, obtainable with --help or -h. I've also added a couple of extra options, --airport=abcd for just generating a particular airport, and --tile=<[we]xxx[ns]xx> for generating a 1x1 degree tile. We currently have --chunk=<[we]xxx[ns]xx> for generating a 10x10 degree chunk, and I'd like to eventually add --tile as an option to all tools that take --chunk.
This one adds the tile option to
tgvpf.
Erik Hofman:
Some small code changes for IRIX.
It looks like the program gets into an infinite loop while findind
edges for a contour (inserting the same edge over and over until the
program runs out of memory). i am not quite sure i understand the code
but the following patch solved the problem for me:
Before:
- if it's a concrete taxiway over 150 ft wide, assume it's an apron
(confusingly called "tiedown")
After:
- if it's an asphalt or concrete taxiway over 150 ft wide, *or* if
it has no blue taxiway lights, assume it's an apron
markings.
- Fix a couple very small alignment/sizing problems.
- Use a different texture (similar to rest) before aim points on nonprecision
runways. This will potentially make things easier if we want to add
skid marks to the textures.
- Fix a couple bugs (el stupido) in precision marking generation.
Originally I through together a really cheap/ugly hack for estimating
distance between two points, but that really started to stink when throwing
a lot of new situations at it. So now I calculate spherical distances between
two points in meters which is plenty accurate for these purposes. This gives
us much better control over smoothing. For instance we could establish a
maximum 10% grade for all roads if we wanted to.
This could cause tile edges to no longer match up becuase this routine would
adjust node elevations which it shouldn't have. Hopefully this change fixes
the problem.
on the command line with the --terrain= option. You can specify as many as you like. Directories specified on the command line will take precidence over
the default directories and the directories will be searched in the order
specified.
in Robin's data.)
- Code adjusted to work with slightly modified input data format (part of
our move away from metakit.)
- Eliminate some debugging output.
Attached are patches to Terragear to enable it to compile out of the box on
Cygwin (once all the relavent libraries have been compiled). Specifically
they fix a conflict with another version of min/max somewhere on the
system.
but because of the use of default arguments, the compiler wasn't flagging
this as an error. This caused a) much stupidity and b) additional stupidity.
I also found a case where I passed in a length and width extention parameters
but, used the length parameter twice ignoring the width parameter. This
yields much more sensible and expected results when building the grass buffer
zone around a runway.
cover" areas. Rather than artificially cut in polygon areas, just lookup
a land cover type for unassigned triangles. I think this has potential, but
it needs more work to eliminate some odd artifacts.
- Revove --min-angle= option.
- Don't re-fit() triangle array to try to achieve a particular range of
node quantities ... this is all pre-computed with a much smarter, much
more efficient algorithm.
impliment essentially the same thing as "ArrayFit". Requires the terra
program, but the terrafit.py script should take care of the pre/post
processing.
is probably better than guessing at a value and fitting to the guessed value.
For corner points (where we *need* a value to do the fit) use the elevation
of the "closest" euclidean-wise valid point.
Then I needed to modify libArray code so that other portions of the code
could use the pre-computed fit data.
Today I discovered that arrayfit was messed up. That is now fixed.
to a higher res data set, attempting to preserve the most important
features in the original data set. The user can specify a min and max
number of output nodes as well as a maximum error tolerance that should
not be exceeded (between the original and simplified surfaces.)
based on the terrain simplification algorithm in Michael Garlands paper
located here:
http://graphics.cs.uiuc.edu/~garland/software/terra.html
Essentially start with two triangles forming the bounding surface.
Then add the point that has the greatest error. Retriangulate.
Recalcuate errors for each remaining point, add the one with the
greatest error. Lather, rinse, repeat.
format. The big trick was that the polygon clipper is completely 2d. So
I needed to add code to preserve the elevations in the clipped output and
fill in plausible elevations for any new points created as a result of the
clipping.
intermediate mode. The goal then is that these elevations would be
preserved throughout the tile construction process and the surrounding
geometry would fill in without gaps. This has potential applications for
airports and runways of course as well as roads, rivers, streams, railroads,
or any other object where we might want to control the final elevation in
advance.
