[osg-users] glCallList doesn't work well in drawImplementation

[forest37]

 
 hi all,
    I want to use opengl display list in Drawable::drawImplementation ,like 
this:
 
void ShapeDrawableEx::drawImplementation(osg::RenderInfo& renderInfo) const
{
     if (globj==0) //ShapeDrawableEx:: mutable GLuint globj; 
     {
        makeCallList();
     }
     glCallList( globj );
}
 
void ShapeDrawableEx::makeCallList() const
{
     globj=glGenLists(1);
     if(globj!=0)
     {
         glNewList(globj,GL_COMPILE);
         ......
        glEndList();
     } 
}
If the drawImplementation is first time called,it works well and I can see the 
drawing.
But if I change the Drawable's color,that's to say the drawImplementation is 
called again,nothing is drawn.
I know that the drawImplementation is called between glNewList and glEndList 
,so it's a hierarchical display list.But it doesn't work well.
Why?
 
thanks
                                                                    forest37
 
 
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