269 lines
7.8 KiB
Markdown
269 lines
7.8 KiB
Markdown
---
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name: splines-evaluate
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description: Evaluate a spline at normalized parameter `t` in [0,1], returning the local-space and world-space position, the tangent (direction of travel), and the up vector. Read-only.
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metadata:
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generated-by: mcp-plugin-dotnet
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---
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# Splines / Evaluate
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Sample a spline at a point along its length. `t` is normalized: 0 is the first knot, 1 is the last knot (or the loop point for a closed spline).
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## Inputs
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- `gameObjectRef` — the GameObject hosting the `SplineContainer` (required).
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- `t` — normalized parameter in [0,1] (default 0.5). Values outside are clamped.
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- `splineIndex` — which spline in the container (default 0).
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## Behavior
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Evaluates local position / tangent / up via `Spline.Evaluate`, transforms the position into world space using the container's transform, and returns all of them. The spline must have at least 2 knots. Read-only. Runs on the Unity main thread.
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## How to Call
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```bash
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unity-mcp-cli run-tool splines-evaluate --input '{
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"gameObjectRef": "string_value",
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"t": 0,
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"splineIndex": 0
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}'
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```
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> For complex input (multi-line strings, code), save the JSON to a file and use:
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> ```bash
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> unity-mcp-cli run-tool splines-evaluate --input-file args.json
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> ```
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>
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> Or pipe via stdin (recommended):
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> ```bash
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> unity-mcp-cli run-tool splines-evaluate --input-file - <<'EOF'
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> {"param": "value"}
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> EOF
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> ```
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### Troubleshooting
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If `unity-mcp-cli` is not found, either install it globally (`npm install -g unity-mcp-cli`) or use `npx unity-mcp-cli` instead.
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Read the /unity-initial-setup skill for detailed installation instructions.
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## Input
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| Name | Type | Required | Description |
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|------|------|----------|-------------|
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| `gameObjectRef` | `any` | Yes | Reference to the GameObject containing the SplineContainer component. |
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| `t` | `number` | No | Normalized parameter along the spline in [0,1] (clamped). Default 0.5. |
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| `splineIndex` | `integer` | No | Index of the spline inside the container (default 0). |
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### Input JSON Schema
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```json
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{
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"type": "object",
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"properties": {
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"gameObjectRef": {
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"$ref": "#/$defs/AIGD.GameObjectRef"
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},
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"t": {
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"type": "number"
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},
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"splineIndex": {
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"type": "integer"
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}
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},
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"$defs": {
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"UnityEngine.EntityId": {
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"type": "string",
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"pattern": "^[0-9]+$"
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},
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"System.Type": {
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"type": "string"
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},
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"AIGD.GameObjectRef": {
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"type": "object",
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"properties": {
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"instanceID": {
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"$ref": "#/$defs/UnityEngine.EntityId",
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"description": "instanceID of the UnityEngine.Object. If it is '0' and 'path', 'name', 'assetPath' and 'assetGuid' is not provided, empty or null, then it will be used as 'null'. Priority: 1 (Recommended)"
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},
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"path": {
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"type": "string",
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"description": "Path of a GameObject in the hierarchy Sample 'character/hand/finger/particle'. Priority: 2."
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},
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"name": {
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"type": "string",
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"description": "Name of a GameObject in hierarchy. Priority: 3."
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},
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"assetType": {
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"$ref": "#/$defs/System.Type",
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"description": "Type of the asset."
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},
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"assetPath": {
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"type": "string",
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"description": "Path to the asset within the project. Starts with 'Assets/'"
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},
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"assetGuid": {
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"type": "string",
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"description": "Unique identifier for the asset."
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}
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},
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"required": [
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"instanceID"
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],
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"description": "Find GameObject in opened Prefab or in the active Scene."
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}
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},
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"required": [
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"gameObjectRef"
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]
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}
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```
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## Output
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### Output JSON Schema
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```json
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{
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"type": "object",
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"properties": {
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"result": {
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"$ref": "#/$defs/com.IvanMurzak.Unity.MCP.Editor.API.Tool_Splines-EvaluateResponse"
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}
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},
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"$defs": {
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"AIGD.GameObjectRef": {
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"type": "object",
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"properties": {
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"instanceID": {
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"$ref": "#/$defs/UnityEngine.EntityId",
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"description": "instanceID of the UnityEngine.Object. If it is '0' and 'path', 'name', 'assetPath' and 'assetGuid' is not provided, empty or null, then it will be used as 'null'. Priority: 1 (Recommended)"
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},
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"path": {
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"type": "string",
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"description": "Path of a GameObject in the hierarchy Sample 'character/hand/finger/particle'. Priority: 2."
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},
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"name": {
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"type": "string",
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"description": "Name of a GameObject in hierarchy. Priority: 3."
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},
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"assetType": {
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"$ref": "#/$defs/System.Type",
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"description": "Type of the asset."
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},
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"assetPath": {
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"type": "string",
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"description": "Path to the asset within the project. Starts with 'Assets/'"
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},
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"assetGuid": {
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"type": "string",
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"description": "Unique identifier for the asset."
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}
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},
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"required": [
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"instanceID"
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],
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"description": "Find GameObject in opened Prefab or in the active Scene."
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},
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"UnityEngine.EntityId": {
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"type": "string",
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"pattern": "^[0-9]+$"
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},
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"System.Type": {
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"type": "string"
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},
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"AIGD.ComponentRef": {
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"type": "object",
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"properties": {
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"index": {
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"type": "integer",
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"description": "Component 'index' attached to a gameObject. The first index is '0' and that is usually Transform or RectTransform. Priority: 2. Default value is -1."
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},
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"typeName": {
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"type": "string",
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"description": "Component type full name. Sample 'UnityEngine.Transform'. If the gameObject has two components of the same type, the output component is unpredictable. Priority: 3. Default value is null."
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},
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"instanceID": {
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"$ref": "#/$defs/UnityEngine.EntityId",
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"description": "instanceID of the UnityEngine.Object. If this is '0', then it will be used as 'null'."
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}
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},
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"required": [
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"index",
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"instanceID"
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],
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"description": "Component reference. Used to find a Component at GameObject."
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},
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"UnityEngine.Vector3": {
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"type": "object",
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"properties": {
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"x": {
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"type": "number"
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},
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"y": {
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"type": "number"
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},
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"z": {
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"type": "number"
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}
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},
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"required": [
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"x",
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"y",
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"z"
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],
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"additionalProperties": false
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},
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"com.IvanMurzak.Unity.MCP.Editor.API.Tool_Splines-EvaluateResponse": {
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"type": "object",
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"properties": {
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"gameObjectRef": {
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"$ref": "#/$defs/AIGD.GameObjectRef",
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"description": "Reference to the SplineContainer GameObject."
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},
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"containerRef": {
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"$ref": "#/$defs/AIGD.ComponentRef",
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"description": "Reference to the SplineContainer component."
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},
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"splineIndex": {
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"type": "integer",
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"description": "Index of the evaluated spline in the container."
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},
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"t": {
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"type": "number",
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"description": "Normalized parameter actually evaluated (after clamping)."
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},
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"localPosition": {
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"$ref": "#/$defs/UnityEngine.Vector3",
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"description": "Local-space position at t."
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},
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"worldPosition": {
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"$ref": "#/$defs/UnityEngine.Vector3",
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"description": "World-space position at t."
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},
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"tangent": {
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"$ref": "#/$defs/UnityEngine.Vector3",
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"description": "Tangent (direction of travel) at t."
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},
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"up": {
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"$ref": "#/$defs/UnityEngine.Vector3",
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"description": "Up vector at t."
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}
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},
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"required": [
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"splineIndex",
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"t",
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"localPosition",
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"worldPosition",
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"tangent",
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"up"
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]
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}
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},
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"required": [
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"result"
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]
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}
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```
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