Creating a Sphere (using osg::Geometry) in OpenSceneGraph

Question

I spent quite some time to get this working, but my Sphere just won\'t display.
Used the following code to make my function:
Creating a 3D sphere in Opengl using Visual

Answer 1

That code calls glutSolidSphere() to draw a sphere, but it doesn't make sense to call it if your application is not using GLUT to display a window with 3D context.

There is another way to draw a sphere easily, which is by invoking gluSphere() (you probably have GLU installed):

void gluSphere(GLUquadric* quad, GLdouble radius, GLint slices, GLint stacks);

Parameters

quad - Specifies the quadrics object (created with gluNewQuadric).

radius - Specifies the radius of the sphere.

slices - Specifies the number of subdivisions around the z axis (similar to lines of longitude).

stacks - Specifies the number of subdivisions along the z axis (similar to lines of latitude).

Usage:

// If you also need to include glew.h, do it before glu.h
#include 

GLUquadric* _quadratic = gluNewQuadric();
if (_quadratic == NULL)
{
    std::cerr << "!!! Failed gluNewQuadric" << std::endl;
    return;
}

glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();

glTranslatef(0.0, 0.0, -5.0);
glColor3ub(255, 97, 3);
gluSphere(_quadratic, 1.4f, 64, 64);

glFlush();

gluDeleteQuadric(_quadratic);

It's probably wiser to move the gluNewQuadric() call to the constructor of your class since it needs to be allocated only once, and move the call to gluDeleteQuadric() to the destructor of the class.