[CC]获取ScalarField的值

//根据字段滤波
void MainWindow::doActionFilterByValue()

 ReferenceCloud* ManualSegmentationTools::segment(GenericIndexedCloudPersist* aCloud, ScalarType minDist, ScalarType maxDist)
 {
     if (!aCloud)
     {
         assert(false);
         return ;
     }

     ReferenceCloud* Y = new ReferenceCloud(aCloud);

     //for each point
     for (unsigned i=; i<aCloud->size(); ++i)
     {
         const ScalarType dist = aCloud->getPointScalarValue(i);
         //we test if its assocaited scalar value falls inside the specified intervale
         if (dist >= minDist && dist <= maxDist)
         {
             if (!Y->addPointIndex(i))
             {
                 //not engouh memory
                 delete Y;
                 Y=;
                 break;
             }
         }
     }

     return Y;
 }