@Override
public void display(GLAutoDrawable gla) {
long t0 = System.currentTimeMillis();
GL gl = gla.getGL();
gl.glClear(GL.GL_COLOR_BUFFER_BIT|GL.GL_ACCUM_BUFFER_BIT|GL.GL_STENCIL_BUFFER_BIT);
gl.glMatrixMode(GL.GL_PROJECTION);
gl.glLoadIdentity();
_glu.gluPerspective(_viewPort.getFOV(),_viewPort.getAspect(),_viewPort.getMinZ(),_viewPort.getMaxZ());
_glu.gluLookAt( _viewPort.getViewWorldX(), _viewPort.getViewWorldY(), -_viewPort.getZ(),
_viewPort.getViewWorldX(), _viewPort.getViewWorldY(), 0,