Drawing a cylinder between two points is a common need, and there are a variety of solutions around on the Internet.
I found the following recenltly posted solution to drawing a cylinder between two points that works very well: http://www.thjsmith.com/40/cylinder-between-two-points-opengl-c Below is this approach for drawing a cylinder between two points implemented using OSG: Code: void AddCylinderBetweenPoints(osg::Vec3 StartPoint, osg::Vec3 EndPoint, float radius, osg::Vec4 CylinderColor, osg::Group *pAddToThisGroup) { osg::Vec3 center; float height; osg::ref_ptr<osg::Cylinder> cylinder; osg::ref_ptr<osg::ShapeDrawable> cylinderDrawable; osg::ref_ptr<osg::Material> pMaterial; osg::ref_ptr<osg::Geode> geode; height = (StartPoint- EndPoint).length(); center = osg::Vec3( (StartPoint.x() + EndPoint.x()) / 2, (StartPoint.y() + EndPoint.y()) / 2, (StartPoint.z() + EndPoint.z()) / 2); // This is the default direction for the cylinders to face in OpenGL osg::Vec3 z = osg::Vec3(0,0,1); // Get diff between two points you want cylinder along osg::Vec3 p = (StartPoint - EndPoint); // Get CROSS product (the axis of rotation) osg::Vec3 t = z ^ p; // Get angle. length is magnitude of the vector double angle = acos( (z * p) / p.length()); // Create a cylinder between the two points with the given radius cylinder = new osg::Cylinder(center,radius,height); cylinder->setRotation(osg::Quat(angle, osg::Vec3(t.x(), t.y(), t.z()))); // A geode to hold our cylinder geode = new osg::Geode; cylinderDrawable = new osg::ShapeDrawable(cylinder ); geode->addDrawable(cylinderDrawable); // Set the color of the cylinder that extends between the two points. pMaterial = new osg::Material; pMaterial->setDiffuse( osg::Material::FRONT, CylinderColor); geode->getOrCreateStateSet()->setAttribute( pMaterial, osg::StateAttribute::OVERRIDE ); // Add the cylinder between the two points to an existing group pAddToThisGroup->addChild(geode); } ------------------ Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=36739#36739 _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
