Added GL picking, matrix retrieval methods
Added GL picking, matrix retrieval methods

ericdill/pyqtgraph,ericdill/pyqtgraph,tropp/acq4,tropp/acq4,nmearl/pyqtgraph,mgraupe/acq4,meganbkratz/acq4,pmaunz/pyqtgraph,petebachant/pyqtgraph,campagnola/acq4,ddamiani/pyqtgraph,campagnola/acq4,benvermaercke/pyqtgraph,stscieisenhamer/pyqtgraph,tropp/acq4,pmaunz/pyqtgraph,JenSte/pyqtgraph,Lx37/pyqtgraph,stscieisenhamer/pyqtgraph,ng110/pyqtgraph,nmearl/pyqtgraph,ng110/pyqtgraph,derricw/pyqtgraph,ericdill/pyqtgraph,jlombacher/pyqtgraph,vallsv/pyqtgraph,ddamiani/pyqtgraph,hiuwo/acq4,acq4/acq4,mgraupe/acq4,mpvismer/pyqtgraph,duguxy/pyqtgraph,mgraupe/acq4,campagnola/acq4,mpvismer/pyqtgraph,derricw/pyqtgraph,petebachant/pyqtgraph,onlyjus/pyqtgraph,pbmanis/acq4,acq4/acq4,hiuwo/acq4,Lx37/pyqtgraph,benvermaercke/pyqtgraph,duguxy/pyqtgraph,campagnola/acq4,mgraupe/acq4,onlyjus/pyqtgraph,benvermaercke/pyqtgraph,tropp/acq4,mgraupe/acq4,JenSte/pyqtgraph,vallsv/pyqtgraph,acq4/acq4,hiuwo/acq4,wonkoderverstaendige/MausverPyler,meganbkratz/acq4,wonkoderverstaendige/MausverPyler,gvalentine/pyqtgraph,acq4/acq4,hiuwo/acq4,welshjf/pyqtgraph,gvalentine/pyqtgraph,welshjf/pyqtgraph,carlomt/dicom_tools,ddamiani/pyqtgraph,jlombacher/pyqtgraph,pbmanis/acq4,onlyjus/pyqtgraph,meganbkratz/acq4,gvalentine/pyqtgraph,hiuwo/acq4,meganbkratz/acq4,carlomt/dicom_tools,pbmanis/acq4,welshjf/pyqtgraph,pbmanis/acq4