private void ScanVoxelMap(int id, IMyVoxelBase voxelMap, IMyCubeBlock turret, BoundingSphereD sphere, bool lastcountisfull, ref Dictionary<Vector3D, MiningInformation> oreList, bool PriorScan = false)
        {    
        
            LogMessageOnThread("Thread start");
        
            ... ... ...
            
            for (var it = new Vector3I_RangeIterator(ref cacheMinI, ref cacheMaxI); it.IsValid(); it.MoveNext())          // iterace jen v intervalu [cachemin .. cachemax]
                    {
                     ... ... ...
                    
                    // test cut_sphere
                    if (! VoxelOperations.SecureSphereIsEmpty(vpos,spawnignoreentityid, 2f))
                           {
                           calcnumvoxelsnonsecure++;
                           continue;
                           }
                    
                     //  nelze pouzit castray - nesmi byt v threadu  (kolize s jinym castray)
                     //  Game version >= 188      use CatRayParallel
                     //-------------------------------------------------------------------------
                       
                     var dirmeter =  vpos - sphere.Center;
                     dirmeter.Normalize();
                     var frompos =  sphere.Center+dirmeter;   
                     var hitinfos = new List<IHitInfo>();    
                     bool hit = false; 
                     
                     // test if Ray hit grid   (grid is before voxel) 
                     LogMessageOnThread(" Thread before call CastRayParallel...");                                                                                                    
                     MyAPIGateway.Physics.CastRayParallel(ref frompos, ref vpos,    hitinfos, 0,                                // without filters
                                             delegate(List<IHitInfo> hitinf)  
                                                {
                                                hit = false;  
                                                LogMessageOnThread(string.Format(" CastRayParallel hitinfos.count: {0}, hitinf.count: {1}", hitinfos.Count, hitinf.Count));                            
                                                foreach (var hitinfo in hitinf)
                                                     {
                                                     if ( hitinfo.HitEntity is IMyVoxelBase)
                                                         {
                                                         //    LogMessageOnThread(string.Format("   Voxelhit(first) at pos: {0}", hitinfo.Position));         
                                                         break;           // voxelhit is first -> end  and ignore
                                                         }
                                                     if ( hitinfo.HitEntity is IMyCubeGrid )
                                                         {
                                                         if ( hitinfo.HitEntity.EntityId != spawnignoreentityid ) 
                                                            {
                                                            // gridhit is first  -> end  and respect (blocked way)
                                                            LogMessageOnThread(string.Format("    Gridhit(first) at pos: {0}", hitinfo.Position));         
                                                            hit =  true;
                                                            break;
                                                            }
                                                         }
                                                     else 
                                                         LogMessageOnThread(string.Format("   Other hit at pos: {0}, Entity {1}", hitinfo.Position, hitinfo.HitEntity));         
                                                     }    
                                                }  
                                            );     // eof call castrayparallel
                     LogMessageOnThread(" Thread after call CastRayParallel...");                       
                                           
                     if (hitinfos.Count >0)                       
                               LogMessageOnThread(string.Format(" CastRayParallel hits.Count {0} to pos: {1}", hitinfos.Count, vpos));   
                                     
                     if (hit)       // I need result HERE
                           {
                           LogMessageOnThread(string.Format(" CastRayParallel to pos: {0} gridhit", vpos));         
                           calcnumvoxelsblocked++;
                           continue;                    // ignore, nonuseable
                           }
                     //--------------------------------------------------------------------- 

                     // accept, useable
                     ... ... ...
                     
                     }
            ... ... ...         
            LogMessageOnThread("Thread scanning end");
            ... ... ...
            LogMessageOnThread("Thread finish\n");
        }