Hello…pls advice me on this.
I just learnt how to draw 2D objects and I would like to try out 3D objects. I already set the glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
glEnable(GL_DEPTH_TEST);
and I also changed the glvertex to include x,y,z coordinates. The problem is it only draws out the object if all the vertex has same z values… I cant draw a cube or anything. In other words I cant get a 3D object out. What exactly is the problem…?
thankx 
Have you rotated the camera to see your object from another point of view? Try using
gluLookAt(10, 0, 0, 0, 0, 0, 0, 1, 0);
to position your camera 10 units on the x-axis, 0 on y and z, looking at the center, and having an up vector.
first, set your projection like this:
resizefunc()
{
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(45.0f, (float)width/height, 0.1f, 100.0f);
glMatrixMode(GL_MODELVIEW);
}
void draw()
{
glLoadIdentity();
gluLookAt(0,0,10,0,0,0, 0,1,0);
//…drawing code
glSwapBuffers()
}