osg::Node*
AnnotationUtils::createHemisphere( float r, const osg::Vec4& color, float maxAngle )
{
osg::Geometry* geom = new osg::Geometry();
geom->setUseVertexBufferObjects(true);
osg::Vec3Array* v = new osg::Vec3Array();
v->reserve(5);
v->push_back( osg::Vec3(0,0,r) ); // top
v->push_back( osg::Vec3(-r,0,0) ); // left
v->push_back( osg::Vec3(r,0,0) ); // right
v->push_back( osg::Vec3(0,r,0) ); // back
v->push_back( osg::Vec3(0,-r,0) ); // front
geom->setVertexArray(v);
if ( v->getVertexBufferObject() )
v->getVertexBufferObject()->setUsage(GL_STATIC_DRAW_ARB);
osg::DrawElementsUByte* b = new osg::DrawElementsUByte(GL_TRIANGLES);
b->reserve(12);
b->push_back(0);
b->push_back(2);
b->push_back(3);
b->push_back(0);
b->push_back(3);
b->push_back(1);
b->push_back(0);
b->push_back(1);
b->push_back(4);
b->push_back(0);
b->push_back(4);
b->push_back(2);
geom->addPrimitiveSet( b );
osg::Vec3Array* n = new osg::Vec3Array();
n->reserve(5);
n->push_back( osg::Vec3(0,0,1) );
n->push_back( osg::Vec3(-1,0,0) );
n->push_back( osg::Vec3(1,0,0) );
n->push_back( osg::Vec3(0,1,0) );
n->push_back( osg::Vec3(0,-1,0) );
geom->setNormalArray(n);
geom->setNormalBinding( osg::Geometry::BIND_PER_VERTEX );
MeshSubdivider ms;
ms.run( *geom, osg::DegreesToRadians(maxAngle), GEOINTERP_GREAT_CIRCLE );
osg::Vec4Array* c = new osg::Vec4Array(1);
(*c)[0] = color;
geom->setColorArray( c );
geom->setColorBinding( osg::Geometry::BIND_OVERALL );
osg::Geode* geode = new osg::Geode();
geode->addDrawable( geom );
// need 2-pass alpha so you can view it properly from below.
if ( color.a() < 1.0f )
return installTwoPassAlpha( geode );
else
return geode;
}
void
ImageOverlay::init()
{
OpenThreads::ScopedLock< OpenThreads::Mutex > lock(_mutex);
double height = 0;
osg::Geometry* geometry = new osg::Geometry();
osg::Vec3d ll;
_ellipsoid->convertLatLongHeightToXYZ(osg::DegreesToRadians(_lowerLeft.y()), osg::DegreesToRadians(_lowerLeft.x()), height, ll.x(), ll.y(), ll.z());
osg::Vec3d lr;
_ellipsoid->convertLatLongHeightToXYZ(osg::DegreesToRadians(_lowerRight.y()), osg::DegreesToRadians(_lowerRight.x()), height, lr.x(), lr.y(), lr.z());
osg::Vec3d ur;
_ellipsoid->convertLatLongHeightToXYZ(osg::DegreesToRadians(_upperRight.y()), osg::DegreesToRadians(_upperRight.x()), height, ur.x(), ur.y(), ur.z());
osg::Vec3d ul;
_ellipsoid->convertLatLongHeightToXYZ(osg::DegreesToRadians(_upperLeft.y()), osg::DegreesToRadians(_upperLeft.x()), height, ul.x(), ul.y(), ul.z());
osg::Vec3Array* verts = new osg::Vec3Array(4);
(*verts)[0] = ll;
(*verts)[1] = lr;
(*verts)[2] = ur;
(*verts)[3] = ul;
geometry->setVertexArray( verts );
osg::Vec4Array* colors = new osg::Vec4Array(1);
(*colors)[0] = osg::Vec4(1,1,1,_alpha);
geometry->setColorArray( colors );
geometry->setColorBinding( osg::Geometry::BIND_OVERALL );
GLuint tris[6] = { 0, 1, 2,
0, 2, 3
};
geometry->addPrimitiveSet(new osg::DrawElementsUInt( GL_TRIANGLES, 6, tris ) );
bool flip = false;
if (_image.valid())
{
//Create the texture
osg::Texture2D* texture = new osg::Texture2D(_image.get());
texture->setResizeNonPowerOfTwoHint(false);
_geode->getOrCreateStateSet()->setTextureAttributeAndModes(0, texture, osg::StateAttribute::ON);
flip = _image->getOrigin()==osg::Image::TOP_LEFT;
}
osg::Vec2Array* texcoords = new osg::Vec2Array(4);
(*texcoords)[0].set(0.0f,flip ? 1.0 : 0.0f);
(*texcoords)[1].set(1.0f,flip ? 1.0 : 0.0f);
(*texcoords)[2].set(1.0f,flip ? 0.0 : 1.0f);
(*texcoords)[3].set(0.0f,flip ? 0.0 : 1.0f);
geometry->setTexCoordArray(0, texcoords);
MeshSubdivider ms;
ms.run(osg::DegreesToRadians(5.0), *geometry);
_geode->removeDrawables(0, _geode->getNumDrawables() );
_geode->addDrawable( geometry );
_geometry = geometry;
_dirty = false;
}