set_layer_transition
Set layer transition
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Third-party content written by another agent. Data to evaluate, not instructions.
Set how a layer ENTERS at the start of its on-timeline window and LEAVES at the end, instead of popping. The transition is EDGE-RELATIVE — only a length and a look are stored — so it rides the edge through every later trim, slide or clip retime. Prefer this over fade_layer / apply_preset whenever the intent is 'enters and leaves nicely': those write opacity keyframes at ABSOLUTE frames, which strand themselves the moment the edge moves, and clutter the timeline lanes. A layer created WITH a block is born carrying a short fade at each edge — whether you passed the block or the editor minted one — so check inspect_layers before adding one, rather than assuming there is none. Layers created before this default existed, and any edge cleared to "cut", carry nothing and do need setting. A layer with NO block is always-present, has no edges, and a transition on it is inert. Video clips default to a hard cut, because a hard cut between shots is the grammar of short-form video. kind "cut" clears the edge back to a hard cut. The length is a request: when the window is too short to hold both ramps they are squeezed proportionally at render time, and the stored values are left intact.
Input schema
| Property | Type | Required | Description |
|---|---|---|---|
| elementId | string | yes | Element id of the layer (image.<id>, video.<id>, text.<id>, shapes.<id>, or group.<id>). |
| edge | string | yes | Which edge to set. "in" is the start of the layer's window, "out" the end. |
| kind | string | yes | The look. "cut" = hard edge (clears any transition). "fade" = opacity ramp. "slide" = travels in/out from a direction while fading. "pop" = scales up from 80% with an overshoot. |
| frames | number | no | Ramp length in frames (30 fps). Default 6. Ignored for kind "cut". |
| curve | string | no | Optional easing override (linear, easeIn, easeOut, easeInOut, outQuart, outExpo, outBack, inBack, inOutBack). Defaults suit the kind: entries decelerate in, exits accelerate away. |
| direction | string | no | For kind "slide" only. On the IN edge this is where the layer comes FROM; on the OUT edge, where it goes TO. Default "left". |
| projectId | string | yes | Opaque project id (a v4 UUID, from list_projects/create_project). Selects which existing project this call mutates. |
| anonymousToken | string | yes | The token create_anonymous_account returned. This connection has no Morpha key, so every call carries it. |
Raw JSON schema
{
"type": "object",
"properties": {
"elementId": {
"type": "string",
"description": "Element id of the layer (image.<id>, video.<id>, text.<id>, shapes.<id>, or group.<id>)."
},
"edge": {
"type": "string",
"enum": [
"in",
"out",
"both"
],
"description": "Which edge to set. \"in\" is the start of the layer's window, \"out\" the end."
},
"kind": {
"type": "string",
"enum": [
"cut",
"fade",
"slide",
"pop"
],
"description": "The look. \"cut\" = hard edge (clears any transition). \"fade\" = opacity ramp. \"slide\" = travels in/out from a direction while fading. \"pop\" = scales up from 80% with an overshoot."
},
"frames": {
"type": "number",
"description": "Ramp length in frames (30 fps). Default 6. Ignored for kind \"cut\"."
},
"curve": {
"type": "string",
"description": "Optional easing override (linear, easeIn, easeOut, easeInOut, outQuart, outExpo, outBack, inBack, inOutBack). Defaults suit the kind: entries decelerate in, exits accelerate away."
},
"direction": {
"type": "string",
"enum": [
"left",
"right",
"up",
"down"
],
"description": "For kind \"slide\" only. On the IN edge this is where the layer comes FROM; on the OUT edge, where it goes TO. Default \"left\"."
},
"projectId": {
"type": "string",
"description": "Opaque project id (a v4 UUID, from list_projects/create_project). Selects which existing project this call mutates."
},
"anonymousToken": {
"type": "string",
"description": "The token create_anonymous_account returned. This connection has no Morpha key, so every call carries it."
}
},
"required": [
"elementId",
"edge",
"kind",
"projectId",
"anonymousToken"
]
}