Shoulder Camera and Reticle

The Over-the-Shoulder Camera

It replaces vanilla's rear third-person view (press F5 once). First person and the front-facing view stay vanilla.
It is purely visual: targeting still works from your eyes.
Defaults: 3.0 blocks behind (range 1 to 8), 0.15 blocks above eye level (range -0.5 to 1.0), 0.85 blocks to the side (range 0 to 1.5; 0 is centred), over the right shoulder, with follow smoothing of 35% (0% is rigid, 100% is softest). All of these can be changed on the Settings page (see Client Settings).
Mouse look is never smoothed, and vertical follow is kept tight so jumping doesn't bounce the view.
The camera eases in before backing into a wall and never ends up inside a block.
It blends back to vanilla's centred view while riding, swimming or crawling, sleeping, dead, gliding with an elytra, riptide-spinning or in spectator, and returns to the shoulder afterward.
Swap shoulders with the "Swap Camera Shoulder" key (unbound by default) or in Settings. Message: "Camera shoulder: Left/Right".
Inside a Susanoo, the camera rises and pulls back to fit each stage's size. Riding a great summon or tailed beast, it pulls up and back to take in the whole creature.
Turning the shoulder camera off in Settings restores vanilla third person, which is handy alongside other camera mods or for accessibility.

The reticle is shown only in the shoulder camera. First person keeps vanilla's crosshair, except in Combat Mode.
It is hidden when a screen is open, when the HUD is hidden (F1), when it's turned off in Settings, or when there is no aim point.
Because the camera is offset, a centre-of-screen crosshair would point at the wrong spot. The reticle is drawn where your eye line really hits: vanilla's target within reach, or the eye line extended up to 64 blocks against blocks.
Out of Combat Mode it is a subtle dot. In Combat Mode it becomes the combat reticle (see Combat Mode).
Opacity: 80% by default (10% to 100%). White with a faint dark outline.