A Guide to Modeling and Unwrapping UVs with Unreal Engine Modeling Mode

What will you learn in this guide?

You’ll learn how to create a basic mesh in Unreal Engine or select an existing model, edit it with Modeling Mode tools, and then inspect and prepare its UV map in UV Editor. The guide covers accessing the tools, unwrapping UVs, arranging islands, and applying changes. Editing models and preparing UVs directly in the editor can help with assets used in games or real-time visualization scenes.

Modeling Mode includes features such as topology editing, UV creation, assigning multiple materials, collision editing, and texture baking. UV Editor provides a more detailed 2D editing view, with options for sewing edges, managing UDIMs, and working with multiple assets. Epic Games marks both tools as beta in its documentation. It’s therefore wise to test them carefully in production workflows and keep backups of important models.

Requirements and preparation

The guides don’t specify a particular Unreal Engine version, account type, or paid license requirement. Don’t assume any version or account requirements, then. If Modeling Mode tools aren’t visible, Epic Games’ guide recommends checking whether the “Modeling Tools Editor Mode” plugin is enabled under Edit > Plugins.

Before starting, select the mesh you want to edit. If you’re modifying a high-resolution model, follow Epic Games’ recommendation and create a copy with the Duplicate tool to preserve the original asset. Most tools in Modeling Mode don’t save changes immediately; they show a preview first. Be sure you understand the difference between confirming an operation with Accept and canceling it with Cancel.

Step by step: creating and editing a mesh

1. Open Modeling Mode. Select Modeling from the Select Mode dropdown menu, or use the Shift+5 shortcut. If the option isn’t visible, check the plugin status. When Modeling Mode opens, the tool categories, tools in the selected category, and tool properties appear in separate panels.

2. Create a new mesh or select an existing one. To create a new shape, choose a primitive from the Create category and move the cursor into the viewport. The shape follows the cursor; click to add it to the level in the desired position. If you need a custom shape, you can draw an outline and create a volume with tools such as Extrude Polygon in the Create category. In this tool, you can change the drawing plane by pressing Ctrl+Click at the desired location.

3. Edit the geometry. To work on an existing mesh, select either Triangle Edit or PolyGroup Edit, then click the mesh. Operations such as Extrude, Push Pull, and Cut Faces are available in the Tool Properties panel. Unreal Engine converts models into triangles; PolyGroups group those triangles to make some modeling operations more familiar to work with.

4. Confirm the change. Check the result in the tool preview. Choose Accept to keep the operation or Cancel to discard the changes. You can undo and redo edits within a tool; after you choose Accept, undo returns the mesh to the state it was in before the tool was applied. For major changes, inspect the result before confirming.

Step by step: preparing a map in UV Editor

1. Open UV Editor. You can use the UV category in Modeling Mode or right-click a mesh in the Level or Content Browser. The editor displays the first UV map of an imported mesh; meshes created in Unreal Engine also have default UVs. The interface includes a toolbar, tools, a 2D viewport, and a 3D viewport.

2. Inspect the UVs and choose a starting method. For a quick start, use AutoUV. The tool automatically unwraps and arranges UVs, and can also work for background assets that don’t need a custom layout. To start manually, use the Seam tool. Create seams by separating edges in the 2D and 3D views, and switch the tool between Split and Sew modes as needed.

3. Edit seams and islands. Seam determines which edges of the model’s surface will be cut open. Sew joins two corresponding edges to create a new UV island. Split can separate selected edges, triangles, or some vertex connections. Try not to place UV seams on visible surfaces; visibility depends on how the model will be used.

4. Arrange UV islands. The Layout tool places UVs in the 0–1 space or, when Preserve UDIMs is enabled, in the source UDIMs. Repack arranges islands together without overlapping them, while Stack can overlap islands; this can be useful for parts that share the same texture design. Allow Flips in Repack can save space, but may cause problems in later operations.

5. Check distortion and apply the result. Unwrap recalculates existing UVs or PolyGroups to reduce stretching and compression. ExpMap is faster; Conformal and SpectralConformal can reduce distortion further, but require more computation. On a complex, unevenly distributed mesh, SpectralConformal results in less distortion but takes longer to calculate. Check the result in the 3D viewport, then use Apply in UV Editor to apply the UV changes to the mesh and Save to save the UV map.

Common mistakes

• Confusing Accept and Apply: In Modeling Mode tools, Accept confirms the current tool operation. In UV Editor, Apply applies UV changes to the original mesh, while Save saves the UV map. Don’t skip these separate steps in the workflow.

• Placing UV seams in visible areas: Seam placement affects how the texture appears on the model. Inspect the islands in the 3D view and plan seams carefully on surfaces that face the user.

• Using the same AutoUV method for every mesh: UV Atlas aims to reduce distortion on organic objects and doesn’t work on Linux. XAtlas is designed for light maps and mechanical meshes; Patch Builder supports large models and is the default method in the engine.

• Not checking the Allow Flips option: This option can save space when arranging islands, but may cause problems in later operations. Test whether it suits your use case.

• Not keeping the original high-resolution model: Creating a copy before editing reduces the risk of being unable to revert changes.

Next steps and workflow impact

These tools can be useful for architectural visualization and interior design teams that want to edit meshes directly in an Unreal Engine scene and check UVs before texturing. Working in the editor without switching applications is especially helpful when a placed asset needs a quick topology or UV adjustment. However, the guides don’t provide specific hardware requirements or compatibility lists for other software, so no firm conclusions can be drawn on those points. Evaluate UV channels according to how the model will be used in the target workflow: a mesh can have different UV maps for layering textures or baking light.

Try the workflow on a copy of the mesh first, check the UVs in the 3D view, and review seam placement before applying and saving changes. Although UV Editor lets you work with multiple meshes and manage UDIMs, the source documents don’t specify recommended settings for every production scenario. It’s therefore safer to treat automatic unwrapping as a starting point and inspect the result on critical assets.

Sources and licensing

This guide is adapted into Turkish from Epic Games’ official documents titled “Modeling Mode in Unreal Engine” and “UV Editor in Unreal Engine.” Both sources are freely accessible and describe the tools as beta.