I am looking for an open source software that could be used to digitize 3D vector objects from a stereo pair of remotely sensed images. Photogrammetry softwares are too expensive for my use (giving an introduction course to 60 students, which means only a dozen of hours every year).
I know a few software that can process stereo images to generate ortho-images and DSM (e.g. MICMAC, OTB...). However, I would like to be able to display an epipolar pair in 3D (e.g. with anaglyph or other 3D devices) and draw some 3D objects directly in 3D. Does it exists (or are you aware of future plug ins to existing OS photogrammetry softwares)?