collection

type: "collection"

Not an effect itself: plays a list of child effects with per-child delays, so several effects start from one command (or one sendEffect).

Fields

Collections also accept the shared definition fields (duration, easing, loop, persistent, fade_ticks, sound).

Field	Type	Default	Meaning
effects	array	— (required)	The child effects, in play order: { "effect": "<id>", "delay": <ticks>, "duration": <ticks>, "params": { ... }, "easing": "<name>" }
effect	string	— (required, per child)	Id of the child effect to play
delay	int	0	Ticks from the collection's start before the child begins
duration	int	0	0 = the child definition's own duration; -1 = persistent
params	object	—	Param overrides for the child. Each value is a full param spec - a plain number is a constant, an object supports start/end, keyframes, bind, expr, multiply
easing	string	linear	Easing for the child's start→end params

Collections nest up to 4 levels. /vfx stop <collection> cancels not-yet-started children; children already playing are stopped by their own /vfx stop <child>.

Example

{
    "type": "collection",
    "effects": [
        { "effect": "vfxweaver:block_tint", "delay": 0 },
        { "effect": "vfxweaver:blur", "delay": 10 },
        { "effect": "vfxweaver:screen_flash", "delay": 40, "duration": 60, "params": { "color_r": 1.0, "color_g": 0.0, "color_b": 0.0, "alpha": 0.6 } },
        { "effect": "vfxweaver:chromatic_aberration", "delay": 55, "duration": 40, "params": { "intensity": 1.2 } }
    ]
}

/vfx play mymap:my_collection

Code

/vfx play vfx_demos:show_collection

Its datapack definition:

{
    "type": "collection",
    "duration": 200,
    "easing": "ease_in_out_cubic",
    "persistent": true,
    "loop": true,
    "fade_ticks": 20,
    "effects": [
        {
            "effect": "vfxweaver:blur",
            "delay": 0,
            "duration": 80,
            "params": {
                "radius": {
                    "keyframes": [
                        {
                            "time": 0,
                            "value": 0.0
                        },
                        {
                            "time": 40,
                            "value": 7.0
                        },
                        {
                            "time": 80,
                            "value": 0.0
                        }
                    ]
                }
            }
        },
        {
            "effect": "vfxweaver:chromatic_aberration",
            "delay": 60,
            "duration": 80,
            "params": {
                "intensity": {
                    "keyframes": [
                        {
                            "time": 0,
                            "value": 0.0
                        },
                        {
                            "time": 40,
                            "value": 0.5
                        },
                        {
                            "time": 80,
                            "value": 0.0
                        }
                    ]
                }
            }
        },
        {
            "effect": "vfxweaver:screen_flash",
            "delay": 120,
            "duration": 80,
            "params": {
                "alpha": {
                    "keyframes": [
                        {
                            "time": 0,
                            "value": 0.0
                        },
                        {
                            "time": 40,
                            "value": 0.16
                        },
                        {
                            "time": 80,
                            "value": 0.0
                        }
                    ]
                },
                "color_r": 1.0,
                "color_g": 0.85,
                "color_b": 0.6
            }
        }
    ]
}