motionBlur

The settings behind the MotionBlur component, and the way to drive the shutter from a script — a photo mode that opens it wide, a quality slider that drops the tap count, a cutscene that closes it for a freeze.

local motionBlur = require("@builtin::systems.motionBlur.motionBlur")

motionBlur.set({ shutterAngle = 180, samples = 16 })
motionBlur.get()        -- a copy of the settings in force
motionBlur.active()     -- whether the passes are running
motionBlur.clear()      -- close the shutter, keep the settings

set takes any subset of the fields; whatever is omitted keeps its current value. A shutterAngle of 0 releases the render feature entirely rather than running three passes that do nothing, and clear is the named way to say the same thing.

The module packs the settings into the motion_blur_params buffer the passes read, so a change lands on the next frame without recompiling anything.

Shutter angle converts to the fraction of a frame the shutter is open — angle / 360. That fraction multiplies the velocity buffer directly, which is what ties blur length to a physical camera parameter rather than to an arbitrary strength slider.