(From this OnePlus 3/3T thread on 4PDA.)
- Based on GCam 3.2 from B-S-G. Fixed some problems and increased the "rate of fire". For the OP3(T), use the Nexus 6 config (HDR+ is off on the front camera) and the Nexus 6P model.
- Long pressing the gallery icon opens Google Photos (thanks to namok).
- Installed as clone.
- Long press the camera switch button opens the settings menu.
This is based on the old Google Camera 3.2. Don't expect any of the modern features.