Horde3D

   void GridNode::renderFunc(uint32 firstItem, uint32 lastItem, const std::string &shaderContext,
      const std::string &theClass, bool debugView, const Frustum *frust1, const Frustum *frust2,
      RenderingOrder::List order, int occSet )
   {
      CameraNode *curCam = Modules::renderer().getCurCamera();
      if( curCam == 0x0 ) return;

      const RenderQueue &renderQueue = Modules::sceneMan().getRenderQueue();

      for( uint32 i = firstItem; i <= lastItem; ++i )
      {
         GridNode *grid = (GridNode *)renderQueue[i].node;

         drawGrid(grid, curCam, frust1, frust2);
      }
   }


   void GridNode::drawGrid(GridNode *grid, CameraNode *cam, const Frustum *frust1, const Frustum *frust2)
   {   
      // TODO fustrum culling check

      glPushAttrib(GL_COLOR_BUFFER_BIT | GL_CURRENT_BIT | GL_DEPTH_BUFFER_BIT |
         GL_ENABLE_BIT | GL_HINT_BIT | GL_LIGHTING_BIT);

      glMatrixMode(GL_PROJECTION);
      glLoadMatrixf(cam->getProjMat().x);

      const float* camTrans = 0;
      cam->getTransMatrices(0, &camTrans);
      Matrix4f transMat (camTrans);
      glMatrixMode(GL_MODELVIEW);
      glLoadMatrixf(transMat.inverted().x);


      glPushMatrix();
      const float* gridTrans = 0;
      grid->getTransMatrices(0, &gridTrans);
      Matrix4f gridTransMat (gridTrans);
      glMultMatrixf(gridTransMat.inverted().x);

      glColor4f(grid->_col_R, grid->_col_G, grid->_col_B, grid->_colMult);
      glBegin(GL_LINE);
      glVertex3f( 0.0f, 0.0f, 0.0f);
      glVertex3f(100.0f, 100.0f, 100.0f);
      glEnd();

      glPopMatrix();
      glPopAttrib();
   }