What are some tips and tricks for optimizing your UV layout and reducing wasted space?

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UV mapping is the process of creating a 2D representation of a 3D model's surface, which can be used for texturing, lighting, and other effects. However, UV mapping can also be challenging and time-consuming, especially if you want to optimize your UV layout and reduce wasted space. Wasted space is the area in the UV map that is not covered by any polygons, which means it is not used for any texture information. Reducing wasted space can improve the quality and efficiency of your textures, as well as save memory and disk space. In this article, we will share some tips and tricks for optimizing your UV layout and reducing wasted space.

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Peter Matejovsky

Inventive Unreal C++ Developer with years of experience in the Training & Simulation field, VR/AR, Serious Games. I…

1 Plan your UV layout

Before you start unwrapping your model, it is important to plan your UV layout and decide how you want to split your model into different UV islands. UV islands are groups of polygons that share the same UV space and texture. You should consider factors such as the size, shape, orientation, and visibility of your model's parts, as well as the resolution and detail of your texture. You should also think about how to minimize the number of seams, which are the edges where two UV islands meet. Seams can create visible discontinuities in your texture, so you should try to hide them in less noticeable areas or match them with the texture's features.

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2 Use UV tools and features

Most 3D software have tools and features that can help you create and edit your UV layout more easily and efficiently. For example, you can use automatic or semi-automatic unwrapping methods, such as cylindrical, spherical, or planar projections, to generate a basic UV layout that you can then adjust manually. You can also use tools such as relax, straighten, or align to smooth, organize, or align your UV islands. Furthermore, you can use features such as snapping, grid, or symmetry to align your UV islands to the UV space or each other. You should also use the checkerboard or gradient test textures to check for any distortion, stretching, or overlapping in your UV layout.

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Peter Matejovsky

Inventive Unreal C++ Developer with years of experience in the Training & Simulation field, VR/AR, Serious Games. I help companies with building better in-house software tools and improving their production capabilities.
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One of the best tools that I have used while working on UVs were the ones from Rizom Lab. Very efficient, packed with useful well-thought features and very easy to pick up and learn.

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3 Optimize your UV scale and rotation

One of the key aspects of optimizing your UV layout and reducing wasted space is to adjust the scale and rotation of your UV islands. The scale of your UV islands determines how much texture resolution they use, and the rotation of your UV islands determines how they fit in the UV space. You should aim to have a consistent and proportional scale for your UV islands, so that they match the size and importance of your model's parts. You should also rotate your UV islands to maximize their coverage of the UV space and minimize the gaps between them. You can use tools such as normalize, pack, or layout to automatically or manually resize, rotate, and arrange your UV islands in the UV space.

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Peter Matejovsky

Inventive Unreal C++ Developer with years of experience in the Training & Simulation field, VR/AR, Serious Games. I help companies with building better in-house software tools and improving their production capabilities.
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It is great to have UVs follow pixels, use tube unwrap and UV straightening to accomplish this. Benefit of straightened and aligned UVs (depending on model) is possibility to offset/scroll them easily or swap textures for different "material" and still get expected results.

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4 Use texture atlases or UDIMs

Another way to optimize your UV layout and reduce wasted space is to use texture atlases or UDIMs. Texture atlases are single textures that contain multiple UV islands for different parts or objects of your model. UDIMs are multiple textures that extend the UV space beyond the standard 0-1 range and allow you to assign different textures to different UV tiles. Both methods can help you increase the texture resolution and variety for your model, as well as simplify the texture management and workflow. However, they also have some drawbacks, such as increased complexity, memory usage, or rendering time. Therefore, you should weigh the pros and cons of using texture atlases or UDIMs for your project.

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5 Use texture padding and bleeding

Finally, one of the essential tips for optimizing your UV layout and reducing wasted space is to use texture padding and bleeding. Texture padding is the extra space that you leave around the edges of your UV islands, which prevents any texture filtering or mipmapping issues. Texture bleeding is the extension of your texture colors beyond the edges of your UV islands, which prevents any seam or aliasing issues. You should always use texture padding and bleeding for your UV layout, especially if you are working with low-resolution textures or game engines. You can use tools such as dilate, expand, or inset to automatically or manually create texture padding and bleeding for your UV layout.

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Peter Matejovsky

Inventive Unreal C++ Developer with years of experience in the Training & Simulation field, VR/AR, Serious Games. I help companies with building better in-house software tools and improving their production capabilities.
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To determine proper padding requirements it is required to know how model will be used and what MIP ranges will be used. In general one of best tips to give to minimize "bleeding" effect is to use proper padding amount but that on itself is not enough. For best results I advise to fill space between UV islands with matching color on the edges of them. Flaming Pearl Solidify PS actions or equivalent SW are great for this. This will ensure that pixels with matching border color will be selected during MIP map process on GPU. One common mistake is to leave background in solid color. Don't do that on production assets.

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6 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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Peter Matejovsky

Inventive Unreal C++ Developer with years of experience in the Training & Simulation field, VR/AR, Serious Games. I help companies with building better in-house software tools and improving their production capabilities.
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One pro tip while working on UV layouts is (if object in question allows it), to leave some empty space in your layout. Why? Later on you might add something to your model, if you did part of layout by hand there is good chance you don't want to redo the whole thing because there is no space left...

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What are some tips and tricks for optimizing your UV layout and reducing wasted space?

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1 Plan your UV layout

2 Use UV tools and features

3 Optimize your UV scale and rotation

4 Use texture atlases or UDIMs

5 Use texture padding and bleeding

6 Here’s what else to consider

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