MRPT 3D viewport navigation: mouse and keyboard usage
All MRPT applications use the following convention:
Orbit camera: Left-button pressed + mouse move.
Zoom in / out:
Mouse scroll wheel, or
SHIFT+Left-button pressed + mouse move up/down.
Look around (pivot camera): CTRL+Left-button pressed + mouse move up/down.
Pan (XY plane): Right button or wheel pressed + mouse move.
Move camera along Z axis: SHIFT+Left-button pressed + mouse move left/right, or (starting in MRPT 2.3.2) SHIFT+scroll wheel for faster up/down vertical motion.
The implementation of the features above by handling mouse and keyboard events can be found in:
mrpt::gui::CGlCanvasBase for Qt and wxWidgets GUIs.
mrpt::gui::CGlCanvasBaseHeadless for nanogui GUIs.