Re: [osg-users] Example of geographical position
Tony, In answer to your question, you want to do the former. Assuming you have a geocentric database, you must convert your lat,lon,elev to a geocentric X,Y,Z (i.e. origin is the center of the earth) and then use these coordinates to set the position accordingly... Osg::Matrix position; earth->computeLocalToWorldTransformFromLatLongHeight(osg::DegreesToRadians(l at), Osg::DegreesToRadians(lon), elev, position); transform->setMatrix(position); "transform" is the node that is part of the entity class I discussed earlier. If you want your entity to move along, you'll need to update the code above in an update callback... -Shayne -Original Message- From: osg-users-boun...@lists.openscenegraph.org [mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Tony Vasile Sent: Sunday, February 07, 2010 8:01 PM To: osg-users@lists.openscenegraph.org Subject: Re: [osg-users] Example of geographical position Hi Shayne, Excuse my newbie status so how do I set up the MatrixTransform do I just use the latitude, longitude and altitude as a translation or do I just set the position of my vehicle using the latitude, longitude to set the position of the vehicle some how. smime.p7s Description: S/MIME cryptographic signature ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Example of geographical position
Hi Shayne, Excuse my newbie status so how do I set up the MatrixTransform do I just use the latitude, longitude and altitude as a translation or do I just set the position of my vehicle using the latitude, longitude to set the position of the vehicle some how. ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Example of geographical position
Tony,
"Entity" is just my own class that can represent an airplane, tank, or
whatever.
The member "Entity->transform" is an osg::MatrixTransform which you'll need
for moving models.
"entityGrp" is an osg::Group*.
-Shayne
-Original Message-
From: osg-users-boun...@lists.openscenegraph.org
[mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Tony Vasile
Sent: Thursday, February 04, 2010 11:25 PM
To: osg-users@lists.openscenegraph.org
Subject: Re: [osg-users] Example of geographical position
Shayne,
What is the type of Entity and entityGrp in the following code snippet?
Along with Robert's suggestion, you can use the following code snippet to
place a vehicle on a spheroid that has VPB terrain, into the scenegraph.
You'll need osgSim and osg::EllipsoidModel to do this.
Entity->lat = 36.4;
Entity->lon = -115.015;
Entity->alt = GetHeightOnTerrain(Entity->
lat, Entity->lon);
entityGrp->addChild(Entity->transform);
double GetHeightOnTerrain(double lat, double lon) {
double X,Y,Z;
double maxElevation = 13000 / 3.281;
earth->convertLatLongHeightToXYZ(osg::DegreesToRadians(lat),
osg::DegreesToRadians(lon),maxElevation, X,Y,Z);
double hat =
osgSim::HeightAboveTerrain::computeHeightAboveTerrain(terrain.get(),
osg::Vec3(X,Y,Z), -1);
return (maxElevation - hat);
}
The "earth" is an osg::EllipsoidModel object and the "terrain" is a node
loaded in from the ive file build by VPB. The entity group node is simply
added to your scenegraph and you're ready to go.
Hopefully this will get you started...:)
-Shayne
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Re: [osg-users] Example of geographical position
Shayne,
What is the type of Entity and entityGrp in the following code snippet?
Along with Robert's suggestion, you can use the following code snippet to
place a vehicle on a spheroid that has VPB terrain, into the scenegraph.
You'll need osgSim and osg::EllipsoidModel to do this.
Entity->lat = 36.4;
Entity->lon = -115.015;
Entity->alt = GetHeightOnTerrain(Entity->
lat, Entity->lon);
entityGrp->addChild(Entity->transform);
double GetHeightOnTerrain(double lat, double lon)
{
double X,Y,Z;
double maxElevation = 13000 / 3.281;
earth->convertLatLongHeightToXYZ(osg::DegreesToRadians(lat),
osg::DegreesToRadians(lon),maxElevation, X,Y,Z);
double hat =
osgSim::HeightAboveTerrain::computeHeightAboveTerrain(terrain.get(),
osg::Vec3(X,Y,Z), -1);
return (maxElevation - hat);
}
The "earth" is an osg::EllipsoidModel object and the "terrain" is a node
loaded in from the ive file build by VPB. The entity group node is simply
added to your scenegraph and you're ready to go.
Hopefully this will get you started...:)
-Shayne
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Re: [osg-users] Example of geographical position
Tony,
Along with Robert's suggestion, you can use the following code snippet to
place a vehicle on a spheroid that has VPB terrain, into the scenegraph.
You'll need osgSim and osg::EllipsoidModel to do this.
Entity->lat = 36.4;
Entity->lon = -115.015;
Entity->alt = GetHeightOnTerrain(Entity->lat, Entity->lon);
entityGrp->addChild(Entity->transform);
double GetHeightOnTerrain(double lat, double lon)
{
double X,Y,Z;
double maxElevation = 13000 / 3.281;
earth->convertLatLongHeightToXYZ(osg::DegreesToRadians(lat),
osg::DegreesToRadians(lon),maxElevation, X,Y,Z);
double hat =
osgSim::HeightAboveTerrain::computeHeightAboveTerrain(terrain.get(),
osg::Vec3(X,Y,Z), -1);
return (maxElevation - hat);
}
The "earth" is an osg::EllipsoidModel object and the "terrain" is a node
loaded in from the ive file build by VPB. The entity group node is simply
added to your scenegraph and you're ready to go.
Hopefully this will get you started...:)
-Shayne
-Original Message-
From: osg-users-boun...@lists.openscenegraph.org
[mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Tony Vasile
Sent: Wednesday, February 03, 2010 5:13 PM
To: osg-users@lists.openscenegraph.org
Subject: [osg-users] Example of geographical position
Hi,
I'm a newbie and trying to find as many examples as I can. What I am
looking for is an example of using a vehicle in latitude, longitude and
altitude and placing it in the scene graph. Unfortunately most of the
applications I have found programs such as Flightgear and Simgear and they
just have far too much code to understand the general ideas quickly.
Any help would be most appreciated.
Another problem I have is with VPB. I have some level 1 DTED data that I
wish to use in my scene graph for collision and occlusion events. Do I need
to have an image overlayed on the DTED data before I can see anything with
osgviewer?
Tony Vasile
CSC Australia
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Re: [osg-users] Example of geographical position
Hi Tony, Have a look at the osgsimuluation example as this uses the CoordinateSystemNode/EllipsoidModel to provide conversion between lat/long/height to XYZ. Robert. On Thu, Feb 4, 2010 at 12:12 AM, Tony Vasile wrote: > Hi, > I'm a newbie and trying to find as many examples as I can. What I am > looking for is an example of using a vehicle in latitude, longitude and > altitude and placing it in the scene graph. Unfortunately most of the > applications I have found programs such as Flightgear and Simgear and they > just have far too much code to understand the general ideas quickly. > Any help would be most appreciated. > > > Another problem I have is with VPB. I have some level 1 DTED data that I > wish to use in my scene graph for collision and occlusion events. Do I need > to have an image overlayed on the DTED data before I can see anything with > osgviewer? > > Tony Vasile > > CSC Australia > > ___ > osg-users mailing list > osg-users@lists.openscenegraph.org > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > > ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
