//Sphere.cc#include "Sphere.h"Sphere::Sphere(float R){  Radius=R;}voidSphere::SetValue(Enum Pname, float v){  if(Pname==RADIUS)    Radius=v;}voidSphere::Render(){  glPushAttrib(GL_ALL_ATTRIB_BITS);  if(ColorNode)    ColorNode->Render();  if(MatNode)    MatNode->Render();  if(TransNode)    TransNode->Render();  if(StyleNode)    StyleNode->Render();    glutSolidSphere(Radius, 40, 40);  glPopAttrib();}