afterimage

type: "afterimage"

Feedback echo: movement leaves smearing trails that linger and dissolve on a fixed decay schedule.

Fields

Every screen effect also accepts screen_layer and the shared definition fields (duration, easing, loop, persistent, fade_ticks, sound).

Field	Type	Default	Meaning
decay	float	0.92	Fraction of the previous frame surviving each tick (0..0.98)
blend	float	0.6	How strongly history mixes into the live image
drift	float	0	Per-frame zoom of the echo, positive stretches outward (negative = shrink)
desat	float	0.35	Saturation loss in the echo layer
intensity	float	1 (fades to 0)	Strength of the echo over the live frame

Example

{
    "type": "afterimage",
    "duration": 60,
    "params": { "decay": 0.92, "blend": 0.6, "drift": 0, "desat": 0.35, "intensity": 1 }
}

/vfx play vfxweaver:afterimage {[intensity:0.5]}

Code

/vfx play vfx_demos:show_afterimage

Its datapack definition:

{
    "type": "afterimage",
    "duration": 160,
    "easing": "ease_in_out_cubic",
    "persistent": true,
    "loop": true,
    "fade_ticks": 12,
    "params": {
        "decay": 0.9,
        "blend": 0.4,
        "drift": {
            "keyframes": [
                {
                    "time": 0,
                    "value": 0.0
                },
                {
                    "time": 80,
                    "value": 0.03
                },
                {
                    "time": 160,
                    "value": 0.0
                }
            ]
        },
        "desat": 0.3,
        "intensity": {
            "keyframes": [
                {
                    "time": 0,
                    "value": 0.25
                },
                {
                    "time": 80,
                    "value": 0.7
                },
                {
                    "time": 160,
                    "value": 0.25
                }
            ]
        }
    }
}