So what I have done in reading a point cloud from a .ply file with point
coordinate in WGS84 (Lat-Long-Height), is that I iterate over each vertex
and convert the coordinates into ECEF format given the functions from
osgEarth:
for(uint elementIdx = 0; elementIdx < vertArray->getNumElements(); ++elementIdx)
{
//--- read current vertex from array
osg::Vec3d llhVert = static_cast<osg::Vec3>((*vertArray)[elementIdx]);
//--- initialize geopoint
osgEarth::GeoPoint geoPoint;
geoPoint =
osgEarth::GeoPoint(osgEarth::SpatialReference::get("epsg:4326", "egm96"),
llhVert.x(), llhVert.y(), llhVert.z(),
osgEarth::ALTMODE_ABSOLUTE);
//--- convert geopoint into ecef point
osg::Vec3d ecefVert;
geoPoint.toWorld(ecefVert);
//--- save vertex
(*vertArray)[elementIdx] = ecefVert;
}
Am Mittwoch, 29. April 2020 05:49:35 UTC+2 schrieb wu:
>
> Can you provide some ideas? I am a novice for osgearth. I use readNodeFile
> fnction to read obj file and display (wgs84), then use writeNodeFile to
> write obj file then display in cesiumlab.
>
> On Tuesday, April 28, 2020 at 7:02:27 PM UTC+8, Boitumelo Ruf wrote:
>>
>> Yes, but internally it will transform the wgs84 coordinates to ECEF in
>> order to place them inside the eucledian coordinate system of osg. Look at:
>> http://forum.osgearth.org/LIDAR-data-visualization-td7592224.html
>>
>> Am Dienstag, 28. April 2020 12:29:01 UTC+2 schrieb wu:
>>>
>>> my osgearth coordinate system use the wgs84 not ECEF
>>>
>>> On Tuesday, April 28, 2020 at 5:12:29 PM UTC+8, Boitumelo Ruf wrote:
>>>>
>>>> Have you checked the osgEarth forum: http://forum.osgearth.org/
>>>>
>>>> osgEarth uses an Earth-Centered-Earth-Fixed (ECEF) eucledian coordinate
>>>> system. Maybe you would need to transform the coordinates inside your .obj
>>>> file first.
>>>>
>>>> Am Dienstag, 28. April 2020 11:03:38 UTC+2 schrieb wu:
>>>>>
>>>>> obj file coordinate is different from what osgearth display！
>>>>> i use osgearth display my pipe (wgs84)
>>>>> pipe display correct，but obj Exported is Incorrect。I checked some
>>>>> information but found no reason！
>>>>>
>>>>>
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