Lot of stereo cameras use random pattern projector to improve surface details required to stereo matching. Do you have any experience with that? What devices are market available?
pattern projectors cannot be used with ZED cameras because they usually are based on IR light and all the ZED cameras are equipped with IR filters for daylight.
Usually, stereo cameras using pattern projectors have two greyscale sensors without IR filters to acquire IR patterns and extract depth information, plus a third RGB sensor to acquire color information.