void createDAIGeometry( osg::Geometry& geom, int nInstances=1 )
{
const float halfDimX( .5 );
const float halfDimZ( .5 );
osg::Vec3Array* v = new osg::Vec3Array;
v->resize( 4 );
geom.setVertexArray( v );
// Geometry for a single quad.
(*v)[ 0 ] = osg::Vec3( -halfDimX, 0., 0. );
(*v)[ 1 ] = osg::Vec3( halfDimX, 0., 0. );
(*v)[ 2 ] = osg::Vec3( halfDimX, 0., halfDimZ*2.0f );
(*v)[ 3 ] = osg::Vec3( -halfDimX, 0., halfDimZ*2.0f );
// create color array data (each corner of our triangle will have one color component)
osg::Vec4Array* pColors = new osg::Vec4Array;
pColors->push_back( osg::Vec4( 1.0f, 0.0f, 0.0f, 1.0f ) );
pColors->push_back( osg::Vec4( 0.0f, 1.0f, 0.0f, 1.0f ) );
pColors->push_back( osg::Vec4( 0.0f, 0.0f, 1.0f, 1.0f ) );
pColors->push_back( osg::Vec4( 0.0f, 0.0f, 1.0f, 1.0f ) );
geom.setColorArray( pColors );
// make sure that our geometry is using one color per vertex
geom.setColorBinding( osg::Geometry::BIND_PER_VERTEX );
osg::Vec2Array* pTexCoords = new osg::Vec2Array( 4 );
(*pTexCoords)[0].set( 0.0f, 0.0f );
(*pTexCoords)[1].set( 1.0f, 0.0f );
(*pTexCoords)[2].set( 1.0f, 1.0f );
(*pTexCoords)[3].set( 0.0f, 1.0f );
geom.setTexCoordArray( 0, pTexCoords );
// Use the DrawArraysInstanced PrimitiveSet and tell it to draw 1024 instances.
geom.addPrimitiveSet( new osg::DrawArrays( GL_QUADS, 0, 4, nInstances ) );
}
nave(int x,int y, int z, int tamaño)
{
pyramidGeode = new osg::Geode();
pyramidGeometry = new osg::Geometry();
pyramidGeode->addDrawable(pyramidGeometry);
osg::Vec3Array* pyramidVertices = new osg::Vec3Array;
//0-4
pyramidVertices->push_back( osg::Vec3( x, y, z) ); // front left
//1-5
pyramidVertices->push_back( osg::Vec3(tamaño+x, y, z) ); // front right
//2-6
pyramidVertices->push_back( osg::Vec3(tamaño+x,tamaño+y, z) ); // back right
//3-7
pyramidVertices->push_back( osg::Vec3( x,tamaño+y, z) ); // back left
//4-0
pyramidVertices->push_back( osg::Vec3( x, y,tamaño+z) ); // peak
//5-1
pyramidVertices->push_back( osg::Vec3(tamaño+x, y,tamaño+z) ); // front right
//6-2
pyramidVertices->push_back( osg::Vec3(tamaño+x,tamaño+y,tamaño+z) ); // back right
//7-3
pyramidVertices->push_back( osg::Vec3( x,tamaño+y,tamaño+z) ); // back left
pyramidGeometry->setVertexArray( pyramidVertices );
osg::DrawElementsUInt* pyramidBase =
new osg::DrawElementsUInt(osg::PrimitiveSet::QUADS, 0);
pyramidBase->push_back(3);
pyramidBase->push_back(2);
pyramidBase->push_back(1);
pyramidBase->push_back(0);
pyramidGeometry->addPrimitiveSet(pyramidBase);
osg::DrawElementsUInt* pyramidTop =
new osg::DrawElementsUInt(osg::PrimitiveSet::QUADS, 0);
pyramidTop->push_back(4);
pyramidTop->push_back(5);
pyramidTop->push_back(6);
pyramidTop->push_back(7);
pyramidGeometry->addPrimitiveSet(pyramidTop);
//Repeat the same for each of the four sides. Again, vertices are
//specified in counter-clockwise order.
osg::DrawElementsUInt* pyramidFaceOne =
new osg::DrawElementsUInt(osg::PrimitiveSet::QUADS, 0);
pyramidFaceOne->push_back(0);
pyramidFaceOne->push_back(1);
pyramidFaceOne->push_back(5);
pyramidFaceOne->push_back(4);
pyramidGeometry->addPrimitiveSet(pyramidFaceOne);
osg::DrawElementsUInt* pyramidFaceTwo =
new osg::DrawElementsUInt(osg::PrimitiveSet::QUADS, 0);
pyramidFaceTwo->push_back(1);
pyramidFaceTwo->push_back(2);
pyramidFaceTwo->push_back(6);
pyramidFaceTwo->push_back(5);
pyramidGeometry->addPrimitiveSet(pyramidFaceTwo);
osg::DrawElementsUInt* pyramidFaceThree =
new osg::DrawElementsUInt(osg::PrimitiveSet::QUADS, 0);
pyramidFaceThree->push_back(2);
pyramidFaceThree->push_back(3);
pyramidFaceThree->push_back(7);
pyramidFaceThree->push_back(6);
pyramidGeometry->addPrimitiveSet(pyramidFaceThree);
osg::DrawElementsUInt* pyramidFaceFour =
new osg::DrawElementsUInt(osg::PrimitiveSet::QUADS, 0);
pyramidFaceFour->push_back(3);
pyramidFaceFour->push_back(0);
pyramidFaceThree->push_back(4);
pyramidFaceFour->push_back(7);
pyramidGeometry->addPrimitiveSet(pyramidFaceFour);
//Declare and load an array of Vec4 elements to store colors.
osg::Vec4Array* colors = new osg::Vec4Array;
colors->push_back(osg::Vec4(0.0f, 0.0f, 0.0f, 1.0f) ); //index 0 red
colors->push_back(osg::Vec4(0.0f, 0.0f, 0.0f, 1.0f) ); //index 1 green
colors->push_back(osg::Vec4(0.0f, 0.0f, 0.0f, 1.0f) ); //index 2 blue
colors->push_back(osg::Vec4(0.0f, 0.0f, 0.0f, 1.0f) ); //index 3 white
colors->push_back(osg::Vec4(1.0f, 1.0f, 1.0f, 1.0f) ); //index 4 red
colors->push_back(osg::Vec4(1.0f, 1.0f, 1.0f, 1.0f) ); //index 4 red
colors->push_back(osg::Vec4(1.0f, 1.0f, 1.0f, 1.0f) ); //index 4 red
colors->push_back(osg::Vec4(1.0f, 1.0f, 1.0f, 1.0f) ); //index 4 red
//The next step is to associate the array of colors with the geometry,
//assign the color indices created above to the geometry and set the
//binding mode to _PER_VERTEX.
pyramidGeometry->setColorArray(colors);
pyramidGeometry->setColorBinding(osg::Geometry::BIND_PER_VERTEX);
};