SGSharedPtr<SGSoundSample> snd = sampleGroup->find("thunder");
if( snd ) {
SGVec3d pos = SGVec3d(ax, ay, -sgEnviro.last_alt);
SGSharedPtr<SGSoundSample> snd = sampleGroup->find("thunder");
if( snd ) {
SGVec3d pos = SGVec3d(ax, ay, -sgEnviro.last_alt);