Assigns a material to specific faces of a ProBuilder mesh. You can select faces by index OR by direction (semantic selection). This enables multi-material meshes where different faces have different materials. Examples: - Set material on top face: faceDirection="up" - Set material on specific faces: faceIndices=[0, 2, 4]
unity-mcp-cli run-tool probuilder-set-face-material --input '{
"gameObjectRef": "string_value",
"materialPath": "string_value",
"faceIndices": "string_value",
"faceDirection": "string_value"
}'
For complex input (multi-line strings, code), save the JSON to a file and use:
unity-mcp-cli run-tool probuilder-set-face-material --input-file args.jsonOr pipe via stdin (recommended):
unity-mcp-cli run-tool probuilder-set-face-material --input-file - <<'EOF' {"param": "value"} EOF
If unity-mcp-cli is not found, either install it globally (npm install -g unity-mcp-cli) or use npx unity-mcp-cli instead.
Read the /unity-initial-setup skill for detailed installation instructions.
| Name | Type | Required | Description |
|---|---|---|---|
gameObjectRef | any | Yes | Reference to the GameObject with a ProBuilderMesh component. |
materialPath | string | Yes | Path to the material asset (e.g., 'Assets/Materials/MyMaterial.mat') or material name. |
faceIndices | any | No | Array of face indices to apply the material to. Use this OR faceDirection, not both. Use ProBuilder_GetMeshInfo to get valid face indices. |
faceDirection | any | No | Semantic face selection by direction. Use this OR faceIndices, not both. |
{
"type": "object",
"properties": {
"gameObjectRef": {
"$ref": "#/$defs/com.IvanMurzak.Unity.MCP.Runtime.Data.GameObjectRef"
},
"materialPath": {
"type": "string"
},
"faceIndices": {
"$ref": "#/$defs/System.Int32[]"
},
"faceDirection": {
"$ref": "#/$defs/com.IvanMurzak.Unity.MCP.Editor.API.FaceDirection"
}
},
"$defs": {
"System.Type": {
"type": "string"
},
"com.IvanMurzak.Unity.MCP.Runtime.Data.GameObjectRef": {
"type": "object",
"properties": {
"instanceID": {
"type": "integer",
"description": "instanceID of the UnityEngine.Object. If it is '0' and 'path', 'name', 'assetPath' and 'assetGuid' is not provided, empty or null, then it will be used as 'null'. Priority: 1 (Recommended)"
},
"path": {
"type": "string",
"description": "Path of a GameObject in the hierarchy Sample 'character/hand/finger/particle'. Priority: 2."
},
"name": {
"type": "string",
"description": "Name of a GameObject in hierarchy. Priority: 3."
},
"assetType": {
"$ref": "#/$defs/System.Type",
"description": "Type of the asset."
},
"assetPath": {
"type": "string",
"description": "Path to the asset within the project. Starts with 'Assets/'"
},
"assetGuid": {
"type": "string",
"description": "Unique identifier for the asset."
}
},
"required": [
"instanceID"
],
"description": "Find GameObject in opened Prefab or in the active Scene."
},
"System.Int32[]": {
"type": "array",
"items": {
"type": "integer"
}
},
"com.IvanMurzak.Unity.MCP.Editor.API.FaceDirection": {
"type": "string",
"enum": [
"Up",
"Down",
"Left",
"Right",
"Forward",
"Back"
]
}
},
"required": [
"gameObjectRef",
"materialPath"
]
}
{
"type": "object",
"properties": {
"result": {
"$ref": "#/$defs/com.IvanMurzak.Unity.MCP.Editor.API.Tool_ProBuilder+SetFaceMaterialResponse"
}
},
"$defs": {
"System.Int32[]": {
"type": "array",
"items": {
"type": "integer"
}
},
"System.Collections.Generic.List<com.IvanMurzak.Unity.MCP.Editor.API.Tool_ProBuilder+MaterialInfo>": {
"type": "array",
"items": {
"$ref": "#/$defs/com.IvanMurzak.Unity.MCP.Editor.API.Tool_ProBuilder+MaterialInfo"
}
},
"com.IvanMurzak.Unity.MCP.Editor.API.Tool_ProBuilder+MaterialInfo": {
"type": "object",
"properties": {
"index": {
"type": "integer"
},
"name": {
"type": "string"
}
},
"required": [
"index"
]
},
"com.IvanMurzak.Unity.MCP.Editor.API.Tool_ProBuilder+SetFaceMaterialResponse": {
"type": "object",
"properties": {
"materialName": {
"type": "string"
},
"materialIndex": {
"type": "integer"
},
"selectionMethod": {
"type": "string"
},
"facesUpdated": {
"$ref": "#/$defs/System.Int32[]"
},
"meshMaterials": {
"$ref": "#/$defs/System.Collections.Generic.List<com.IvanMurzak.Unity.MCP.Editor.API.Tool_ProBuilder+MaterialInfo>"
}
},
"required": [
"materialIndex"
]
}
},
"required": [
"result"
]
}