Difference between revisions of "Virtual Planet Builder"

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(Running VPB)
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== Running VPB ==
 
== Running VPB ==
  
Here are the options I've used:
+
Here are the options I've used to generate some scenery of the UK:
  
  ./bin/osgdem --geocentric -t /home/stuart/FlightGear/VPB/data/CORINE/u2018_clc2018_v2020_20u1_raster100m/DATA/U2018_CLC2018_V2020_20u1.tif -d /home/stuart /FlightGear/VPB/data/SRTM90/srtm_36_01.tif -e -5 54 -2 56 --PagedLOD -l 5 --RGB-24 -o foo.osgb
+
  ./bin/osgdem --TERRAIN \
 +
--compressor-nvtt \
 +
--compression-quality-highest \
 +
--geocentric \
 +
-t /home/stuart/FlightGear/VPB/data/CORINE/u2018_clc2018_v2020_20u1_raster100m/DATA/U2018_CLC2018_V2020_20u1.tif \
 +
-d /home/stuart/FlightGear/VPB/data/SRTM90/srtm_34_02.tif \
 +
-d /home/stuart/FlightGear/VPB/data/SRTM90/srtm_35_01.tif \
 +
-d /home/stuart/FlightGear/VPB/data/SRTM90/srtm_35_02.tif \
 +
-d /home/stuart/FlightGear/VPB/data/SRTM90/srtm_36_01.tif \
 +
-d /home/stuart/FlightGear/VPB/data/SRTM90/srtm_36_02.tif \
 +
-b -10 50 0 60 \
 +
--PagedLOD \
 +
-l 8 \
 +
-o uk.osgb
  
 +
* --TERRAIN to use osgTerrain::Terrain database
 +
*  --compressor-nvtt --compression-quality-highest to generate native mipmaps
 
* --geocentric because that's what FG uses
 
* --geocentric because that's what FG uses
 +
* -t the texture to drape (in this case CORINE)
 +
* -d the DEM to use (in this case pieces of SRTM90)
 +
* -b is the extents in decimal degrees: LON1 LAT1 LON2 LAT2
 
* --PagedLOD to generate PagedLOD nodes
 
* --PagedLOD to generate PagedLOD nodes
 
* -l 5 the number of LOD levels to generate
 
* -l 5 the number of LOD levels to generate
* -t the texture to drape (in this case CORINE)
 
* -d the DEM to use (in this case a piece of SRTM90)
 
* -e is the extents in decimal degrees: LON1 LAT1 LON2 LAT2
 
* --RGB-24 to user an RGB output texture
 
 
* -o is the output file, in this case native OSG binary format.
 
* -o is the output file, in this case native OSG binary format.

Revision as of 14:22, 2 June 2020

VirtualPlanetBuilder (VPB) is an OSG tool that generates native OSG data to represent terrain, usually by draping a GEO-TIFF over an elevation model.

Building VirtualPlanetBuilder

The VPB project and code can be found here: https://github.com/openscenegraph/VirtualPlanetBuilder

If you've got an existing FlightGear build, there are some additional dependencies:

  • OSG
    • Including NVTT. ('sudo apt-get install libnvtt-dev' - oddly VPB builds without it but then checks for the shared library at runtime...)
  • GDAL (https://gdal.org/)
    • ... which requires PROJ 6 or above (https://proj.org/)
      • ... which requires the sqlite3.11 or above development package (on linux - 'sudo apt-get install libsqlite3-dev')

Note that GDAL and PROJ do not use cmake, so it builds in the source directory as follows:

./configure -prefix=/path/to/install
make

VPB is built using cmake e.g.

cmake -DOSG_DIR=/path/to/OSG/install /path/to/VPB/src
make

Getting Landcover Data

For CORINE data covering Europe, try here: https://land.copernicus.eu/pan-european/corine-land-cover/clc2018

Choose RASTER data, which will download a geo-referenced TIF image.

Getting DEM data.

For SRTM, try here: http://srtm.csi.cgiar.org/

Again, Raster data is fine.

Running VPB

Here are the options I've used to generate some scenery of the UK:

./bin/osgdem --TERRAIN \
--compressor-nvtt \
--compression-quality-highest \
--geocentric \
-t /home/stuart/FlightGear/VPB/data/CORINE/u2018_clc2018_v2020_20u1_raster100m/DATA/U2018_CLC2018_V2020_20u1.tif \
-d /home/stuart/FlightGear/VPB/data/SRTM90/srtm_34_02.tif \
-d /home/stuart/FlightGear/VPB/data/SRTM90/srtm_35_01.tif \
-d /home/stuart/FlightGear/VPB/data/SRTM90/srtm_35_02.tif \
-d /home/stuart/FlightGear/VPB/data/SRTM90/srtm_36_01.tif \
-d /home/stuart/FlightGear/VPB/data/SRTM90/srtm_36_02.tif \
-b -10 50 0 60 \
--PagedLOD \
-l 8 \
-o uk.osgb
  • --TERRAIN to use osgTerrain::Terrain database
  • --compressor-nvtt --compression-quality-highest to generate native mipmaps
  • --geocentric because that's what FG uses
  • -t the texture to drape (in this case CORINE)
  • -d the DEM to use (in this case pieces of SRTM90)
  • -b is the extents in decimal degrees: LON1 LAT1 LON2 LAT2
  • --PagedLOD to generate PagedLOD nodes
  • -l 5 the number of LOD levels to generate
  • -o is the output file, in this case native OSG binary format.