Как определить любую точку 3DSolid.

 ads_name adsSelSet;
AcDbObjectId entId;
AcDbObject *pEnt;
ads_name ename;
int i,ii;
long length;
AcGePoint3d pt;
if (RTNORM != acedSSGet( NULL, NULL, NULL, NULL, adsSelSet ))
        {
        acutPrintf( "\nкоманда отменена\n" );
            acedPostCommandPrompt();
            return;
        }
acedSSLength(adsSelSet, &length);
for (i = 0; i < length; i++)
{
        acedSSName(adsSelSet, i, ename);
        acdbGetObjectId(entId, ename);
        acdbOpenObject(pEnt, entId, AcDb::kForRead);
        AcDbSolid* face = (AcDbSolid*)pEnt;
        AcGePoint3d pt;
    ASSERT(solid != NULL);
    for (ii=0;i<4;i++) {
        if (face->getPointAt(ii, pt) == Acad::eOk)
        {face->getPointAt(ii, pt);
.....
        }
pEnt->close;
}