How do you test and preview your UV stitching results?

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UV mapping is the process of projecting a 2D image onto a 3D model, creating a texture that wraps around the surface. To avoid distortion and seams, you need to stitch together the UV islands, which are the flattened pieces of the model. But how do you test and preview your UV stitching results? In this article, we will show you some tips and tools to check your UV layout and fix any issues.

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Christian Moser

Partner of Zühlke & Global Chief Digital Experience | Trusted Advisor | Thought Leader | Keynote Speaker |President of…
Robert Quinn

Special Projects & Visuals

1 Use a checker texture

One of the easiest ways to test your UV stitching is to apply a checker texture to your model. A checker texture is a simple pattern of squares or colors that helps you see how the image is mapped onto the 3D surface. You can create your own checker texture in an image editor, or use one of the presets available in your 3D software. The checker texture should have a high contrast and a small size, so you can see the details clearly. You can also add numbers or letters to the checker texture, to identify the different UV islands. When you apply the checker texture to your model, you should look for any signs of distortion, stretching, overlapping, or gaps in the pattern. If the checker texture looks even and consistent across the model, it means your UV stitching is good. If not, you need to adjust your UV layout and stitch again.

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Christian Moser

Partner of Zühlke & Global Chief Digital Experience | Trusted Advisor | Thought Leader | Keynote Speaker |President of the Swiss UX Association
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Absolutely! For easy UV stitch testing, apply a high-contrast checker texture. Look for distortion, stretching, overlaps, or gaps. Even and consistent pattern means good UV stitching!

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2 Use a UV test grid

Another way to test your UV stitching is to use a UV test grid, which is a special image that shows the UV coordinates of each pixel. A UV test grid has horizontal and vertical lines that represent the U and V axes, and numbers that indicate the position of each UV island. You can download a UV test grid from online sources, or create your own in an image editor. The UV test grid should have a high resolution and a clear font, so you can read the numbers easily. You can also add colors or shapes to the UV test grid, to differentiate the UV islands. When you apply the UV test grid to your model, you should look for any signs of misalignment, rotation, scaling, or flipping in the numbers and lines. If the UV test grid matches the UV layout in your 3D software, it means your UV stitching is accurate. If not, you need to correct your UV coordinates and stitch again.

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Christian Moser

Partner of Zühlke & Global Chief Digital Experience | Trusted Advisor | Thought Leader | Keynote Speaker |President of the Swiss UX Association
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My recommendation: Use a UV test grid to validate your UV stitching. It helps identify misalignment, rotation, scaling, or flipping issues before texturing your model. ??

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3 Use a 3D painting software

A third way to test your UV stitching is to use a 3D painting software, which is a program that allows you to paint directly on your model. A 3D painting software can help you see how your texture will look on your model, and how it will react to lighting and shading. You can use a 3D painting software to paint over the seams, blend the colors, add details, and fix any errors in your texture. Some examples of 3D painting software are Substance Painter, Blender, ZBrush, and 3D-Coat. To use a 3D painting software to test your UV stitching, you need to export your model and your UV layout from your 3D software, and import them into the 3D painting software. Then, you can apply a base color or a material to your model, and start painting on it. You can also use brushes, stencils, stamps, or masks to create different effects. You should check your painting from different angles and distances, and see how it looks on your model. If your painting looks smooth and seamless on your model, it means your UV stitching is fine. If not, you need to go back to your 3D software and stitch again.

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Christian Moser

Partner of Zühlke & Global Chief Digital Experience | Trusted Advisor | Thought Leader | Keynote Speaker |President of the Swiss UX Association
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While 3D painting software is a great tool, I recommend using it alongside other techniques like checker maps and test renders for a comprehensive evaluation. Before diving into 3D painting, use checker maps (textures with alternating black and white squares) applied to your UV layout to identify obvious stretching and distortions. After fixing major issues with checker maps, create test renders with basic materials to see how the textures interact under lighting conditions. Once you've addressed major issues, use 3D painting software for a final polish, focusing on subtle details and overall visual consistency.

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4 Use a game engine or a renderer

A fourth way to test your UV stitching is to use a game engine or a renderer, which are programs that simulate how your model will look in a final environment. A game engine or a renderer can help you see how your texture will interact with other elements, such as lights, shadows, reflections, and animations. You can use a game engine or a renderer to preview your model in different settings, and adjust your texture accordingly. Some examples of game engines and renderers are Unity, Unreal Engine, Maya, and Cinema 4D. To use a game engine or a renderer to test your UV stitching, you need to export your model and your texture from your 3D software, and import them into the game engine or the renderer. Then, you can set up a scene with some lights, cameras, and objects, and render or play your model. You should check your model from various perspectives and movements, and see how it behaves in the scene. If your model looks realistic and natural in the scene, it means your UV stitching is successful. If not, you need to modify your texture and stitch again.

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Christian Moser

Partner of Zühlke & Global Chief Digital Experience | Trusted Advisor | Thought Leader | Keynote Speaker |President of the Swiss UX Association
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?? Test your mapping in the final environment: Test your UVs in a game engine or renderer for realistic interaction with lighting, shadows, reflections, and animation. This helps catch issues that might not be apparent in simpler tests.

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Zakia A.

Senior Character Artist
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When testing your UV map in engine, it is especially important to consider the type model that’s being UV mapped. This can be done by identifying the type of modelled asset, then considering a suitable method most applicable for the particular model. For example, organic modelling, locating hidden seems that naturally fall on areas such as the forehead, where noticeable. Pay attention to UV density by using a checkered and labelled UV map, keeping UV density even between apposing islands. This helps to prevent UV stretching that can cause texture distortion or baking artefacts which can also be shown or appear in engine.

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5 Here’s what else to consider

This is a space to share examples, stories, or insights that don’t fit into any of the previous sections. What else would you like to add?

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Robert Quinn

Special Projects & Visuals
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These are great introductory basics & flows, but seems rather informative io insightful. One thing I can add that is still often overlooked in pre-production is creating a rig test for uvs. More and more character artists receive their character UVd for them, sometimes poorly packed or UVd, making surprises down the line very counter “pipe”productive. So, for something like a main character, or creature that will often be seen from up close, animated. I very strongly recommend creating a rig test cycle pushing the poses, limbs & any other enveloped or “stretch/squashing” polygons. This stetch test will help reveal problematic areas before you render a shot get to comp and cry. Watch out for normals, bumps, displacement stitch lines. :)

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How do you test and preview your UV stitching results?

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1 Use a checker texture

2 Use a UV test grid

3 Use a 3D painting software

4 Use a game engine or a renderer

5 Here’s what else to consider

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