_____ From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Renan Mendes Sent: Sunday, December 02, 2007 3:40 PM To: OpenSceneGraph Users Subject: Re: [osg-users] Creating shapes using Geometry Hey, Jean-Sébastien. Now I'm asking for that example code you've offered me, if that still stands... I haven't tried hard enough, to be honest, but I sure have no extra time to deal with this properly right now. Not to mention the guy I work with, which is breathing down my neck... I would appreciate that favor very much. Thanks. Renan M Z Mendes Hi Renan -- Not sure exactly what aspect of this you're having trouble with. I've attached some very simple code for drawing a unit circle into one of the three coordinate planes; if this simple code insults your intelligence, I apologize. Expanding this code to draw spheres, cones, cylinders, etc., is an exercise in trig and use of the OpenGL primitive types. Hope this helps get you started... -Paul #include <osg/LineWidth> #include <osg/Geometry> #include <osg/math> #include <math.h> osg::Vec3Array* circleVerts( int plane, int approx ) { const double angle( osg::PI * 2. / (double) approx ); osg::Vec3Array* v = new osg::Vec3Array; int idx; for( idx=0; idx<approx; idx++) { double cosAngle = cos(idx*angle); double sinAngle = sin(idx*angle); double x(0.), y(0.), z(0.); switch (plane) { case 0: // X y = cosAngle; z = sinAngle; break; case 1: // Y x = cosAngle; z = sinAngle; break; case 2: // Z x = cosAngle; y = sinAngle; break; } v->push_back( osg::Vec3( x, y, z ) ); } return v; } osg::Geode* circles( int plane, int approx ) { 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 ); 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; }
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