const SGReaderWriterBTGOptions* btgOptions
= dynamic_cast<const SGReaderWriterBTGOptions*>(options);
if (btgOptions) {
matlib = btgOptions->getMatlib();
calcLights = btgOptions->getCalcLights();
useRandomObjects = btgOptions->getUseRandomObjects();
const SGReaderWriterBTGOptions* btgOptions
= dynamic_cast<const SGReaderWriterBTGOptions*>(options);
if (btgOptions) {
matlib = btgOptions->getMatlib();
calcLights = btgOptions->getCalcLights();
useRandomObjects = btgOptions->getUseRandomObjects();