[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 0;
    }

    ReferenceCloud* Y = new ReferenceCloud(aCloud);

    //for each point
    for (unsigned i=0; 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=0;
                break;
            }
        }
    }

    return Y;
}