Multiple Spheres in JOGL

OpenGL Development JOGL Development
#1

Hi,

I’m learning to use JOGL in my programs and I have a following question. Do I have to create a new GLUquadric object for every sphere that I wish to draw? That is, if I want to draw three spheres using texture mapping do I have to create three GLUquadrics also?

And could someone tell me what is wrong in the following code (it draws only white spheres, not texture mapped):


public void display(GLDrawable arg0) {
            
            gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);
            gl.glLoadIdentity();                         // Reset The View
            gl.glTranslatef(0.0f, 0.0f, -5.0f);
                              
            // Draws a sphere
            Set coords = sphereCoords.keySet();
            
            for (Iterator iter = coords.iterator(); iter.hasNext();) {                  
                  Point centerPoint = (Point) iter.next();
                  GLUquadric quadric = (GLUquadric) sphereCoords.get(centerPoint);
                  
                  gl.glBindTexture(GL.GL_TEXTURE_2D, texture[0]);            
                  gl.glTranslatef(centerPoint.getX(), centerPoint.getY(), -5.0f);
                  glu.gluSphere(quadric, 1.3f, 32, 32);
            }
      }

I have created GLUquadric for every sphere so the problem isn’t there.

#2

Have you enabled texture mapping using “gl.glEnable(GL.GL_TEXTURE_2D)”?

#3

You forgot this one glu.gluQuadricTexture(quadric,true);