Momentum puts a set of critically-damped springs on the first-person camera, so the view banks, sways, dips and rolls with what you're doing instead of sitting still like a tripod. It's all angle maths - no projection change, no shaders.

Five springs

Strafe bank - the view rolls into sideways movement.
Turn sway - lags behind fast look turns and overshoots slightly when you stop.
Landing dip - dips when you land, scaled by how fast you were falling.
Sprint lurch - a small forward kick when a sprint starts.
Elytra bank - rolls into elytra turns like a plane.

Tuning

A master strength plus its own slider for every effect.
Max roll caps total tilt so the view edges never clip.
Reduce motion halves everything and turns off the impulse effects.

Compatibility

Client-side and first-person only. It works through the camera-angle event, so there are no mixins and no change to your FOV or projection - it can't corrupt render state, and it sits fine next to Sodium, Iris, shaderpacks and other camera or FOV mods.

Configuration

Sodium's video settings has a Momentum page with Master, Effects and Limits groups. Also in config/momentum.json.

Client-side, NeoForge 1.21.1, JDK 21. No server install needed. MIT licensed. Free to use in modpacks.

Camera Momentum