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probuilder-flip-normals

Reverses face normal directions on ProBuilder meshes in Unity scenes.

1|Updated Apr 1, 2026
Search Tags:#unity#level design#3d modeling#probuilder#unity-mcp-cli#mesh editing#flip normals
One-click install
npx skills add https://github.com/Fermisloth/Project-Aegis-Adaptive-Outbreak-Containment --skill probuilder-flip-normals-fermisloth
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: probuilder-flip-normals
Source: https://github.com/Fermisloth/Project-Aegis-Adaptive-Outbreak-Containment/tree/main/.agent/skills/probuilder-flip-normals
Command: npx skills add https://github.com/Fermisloth/Project-Aegis-Adaptive-Outbreak-Containment --skill probuilder-flip-normals-fermisloth

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill requires unity-mcp-cli.

What problem does it solve? ProBuilder meshes sometimes have faces pointing the wrong way, causing invisible surfaces, broken lighting, or incorrect rendering. This Skill flips the normals of selected faces so interior spaces and inverted geometry render correctly without manual mesh editing. ## Core Features & Use Cases - Flip All Faces: Reverse every face normal on a ProBuilder mesh by leaving both selection parameters empty. - Directional Selection: Flip only faces pointing in a semantic direction such as Up, Down, Left, Right, Forward, or Back. - Index-Based Selection: Flip specific faces by providing an explicit array of face indices. - Use Case: When building an interior room from a ProBuilder cube, flip all normals so the surfaces face inward and become visible from inside the room. ## Quick Start Flip all face normals on the ProBuilder mesh attached to the GameObject named RoomShell so its interior surfaces render correctly.

Frequently Asked Questions about probuilder-flip-normals

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I flip normals on a ProBuilder mesh in Unity?▼

Call the probuilder-flip-normals tool through unity-mcp-cli with a gameObjectRef pointing to the GameObject that has a ProBuilderMesh component. Leave faceIndices and faceDirection empty to flip all faces at once.

How to flip only specific faces in ProBuilder?▼

Provide a faceIndices array with the integer indices of the faces to flip, or set faceDirection to a semantic value like Up, Down, Left, Right, Forward, or Back. If both are empty, every face on the mesh is flipped.

Why are my ProBuilder faces invisible from one side?▼

Faces render only from the side their normals point toward due to backface culling. Flipping the normals reverses the visible side, which is the standard fix for inverted faces or for creating interior spaces.

What if unity-mcp-cli is not found when running the tool?▼

Install the CLI globally with npm install -g unity-mcp-cli, or prefix commands with npx unity-mcp-cli. The unity-initial-setup skill contains detailed installation instructions.

What does the flip normals tool return after execution?▼

It returns the number of faces flipped, the selection method used, the affected face indices, and the total face and vertex counts of the mesh, letting you verify the operation's scope.

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