Method cullCells

Engine/source/terrain/terrCell.cpp:966–1018

}

void TerrCell::cullCells(  const SceneRenderState *state,
                           const Point3F &objLodPos,
                           Vector<TerrCell*> *outCells  )
{
   // If we have a VB and no children then just add 
   // ourselves to the results and return.
   if ( mVertexBuffer.isValid() && !mChildren[0]  )               
   {
      outCells->push_back( this );
      return;
   }

   const F32 screenError = mTerrain->getScreenError();
   const BitVector &zoneState = state->getCullingState().getZoneVisibilityFlags();

   for ( U32 i = 0; i < 4; i++ )
   {
      TerrCell *cell = mChildren[i];

      // Test cell visibility for interior zones.
      
      const bool visibleInside = !cell->getZoneOverlap().empty() ? zoneState.testAny( cell->getZoneOverlap() ) : false;

      // Test cell visibility for outdoor zone, but only
      // if we need to.

      bool visibleOutside = false;
      if( !mIsInteriorOnly && !visibleInside )
      {         
         U32 outdoorZone = SceneZoneSpaceManager::RootZoneId;
         visibleOutside = !state->getCullingState().isCulled( cell->mOBB, &outdoorZone, 1 );
      }

      // Skip cell if neither visible indoors nor outdoors.

      if( !visibleInside && !visibleOutside )
         continue;

      // Lod based on screen error...
      // If far enough, just add this child cells vb ( skipping its children ).
      F32 dist = cell->getDistanceTo( objLodPos );
      F32 errorMeters = ( cell->mSize / smMinCellSize ) * mTerrain->getSquareSize();
      U32 errorPixels = mCeil( state->projectRadius( dist, errorMeters ) );

      if ( errorPixels < screenError )
      {
         if ( cell->mVertexBuffer.isValid() )
            outCells->push_back( cell );       
      }
      else      
         cell->cullCells( state, objLodPos, outCells );
   }
}

void TerrCell::getRenderPrimitive(  GFXPrimitive *prim,
                                    GFXVertexBufferHandleBase *vertBuff,