pik4dPIX4Ddiscovery is free of charge, unlimited in time and lets Pix4D users process and assess their projects of any size with limited output results. PIX4Ddiscovery is free of charge. To use it, aThere are three methods to import a tie point .csv or .txt file into PIX4Dmatic. One is accessible through the File tab in the main header, and the others are accessible from the Tie Points panel. [1] Go to the Menu bar and select File >