Hi, Paul.
Not in any way did your code insulted my intelligence. I haven't been to any
Computer Graphics course in my whole life, so keep feeding me with the
basics! : )
Well. I've got a question here. I've addapted that code you've given me so
that it was supposed to create a sphere. You can deduce that it didn't (it
just draws the original circle). I was wondering if you could point out my
mistake. It doesn't seem to be in the logics of computer graphics, but
something I don't know about OSG. Thanks for your help.
////////CODE///////////
#include <osg/LineWidth>
#include <osg/Geometry>
#include <osg/math>
#include <math.h>
#include <osgViewer/Viewer>
osg::Vec3Array*
circleVerts( int plane, int approx, float radius )
{
const double angle( osg::PI * 2. / (double) approx );
osg::Vec3Array* v = new osg::Vec3Array;
int idx, count;
double x(0.), y(0.), z(0.);
double height;
double original_radius = radius;
for(count = 0; count <= approx/4; count++)
{
height = original_radius*sin(count*angle);
radius = cos(count*angle)*radius;
switch(plane)
{
case 0: // X
x = height;
break;
case 1: //Y
y = height;
break;
case 2: //Z
z = height;
break;
}
for( idx=0; idx<approx; idx++)
{
double cosAngle = cos(idx*angle);
double sinAngle = sin(idx*angle);
switch (plane) {
case 0: // X
y = radius*cosAngle;
z = radius*sinAngle;
break;
case 1: // Y
x = radius*cosAngle;
z = radius*sinAngle;
break;
case 2: // Z
x = radius*cosAngle;
y = radius*sinAngle;
break;
}
v->push_back( osg::Vec3( x, y, z ) );
}
}
return v;
}
osg::Geode*
circles( int plane, int approx, float radius )
{
osg::Geode* geode = new osg::Geode;
osg::LineWidth* lw = new osg::LineWidth( 3. );
geode->getOrCreateStateSet()->setAttributeAndModes( lw,
osg::StateAttribute::ON );
osg::Geometry* geom = new osg::Geometry;
osg::Vec3Array* v = circleVerts( plane, approx, radius );
geom->setVertexArray( v );
osg::Vec4Array* c = new osg::Vec4Array;
c->push_back( osg::Vec4( 1., 1., 1., 1. ) );
geom->setColorArray( c );
geom->setColorBinding( osg::Geometry::BIND_OVERALL );
geom->addPrimitiveSet( new osg::DrawArrays( GL_LINE_LOOP, 0, approx ) );
geode->addDrawable( geom );
return geode;
}
int main(int argc, char **argv)
{
// use an ArgumentParser object to manage the program arguments.
osg::ArgumentParser arguments(&argc,argv);
osg::DisplaySettings::instance()->setMinimumNumAlphaBits(8);
// construct the viewer.
osgViewer::Viewer viewer;
osg::Group* root = new osg::Group();
root->addChild(circles(0, 200, 1.0));
viewer.setSceneData(root);
return viewer.run();
}
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