Fix Texture Seam in UE5 Material

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Video Title: Fixing Texture Tiling Issues with Custom UV Coordinates in Unreal Engine

Introduction:
Hi guys, I’m Asif Ali, and you’re watching CGHOW. In this video, we’ll go through a basic yet essential trick to fix texture tiling issues in Unreal Engine. We’ll focus on how to solve seams that appear when tiling a texture on specific meshes, especially circular ones. Let’s dive into how we can fix this issue and get a cleaner, seamless texture output.

Scene Setup:

• On the left, we have a scene with visible seams, and on the right, no seams due to using a custom tiling solution.
• I’ll walk you through the steps of fixing this issue using texture coordinates.

The Problem:

• Both sides of the scene appear the same with identical meshes and settings, but there’s a noticeable seam when using certain tiling values like 1.5.
• When the texture is tiled across a flat plane or box, it looks fine, but when applied to a mesh like a disk, the texture starts to repeat incorrectly, causing a seam.

Solution Steps:

1. Create a New Folder and Material:
   • Let’s start by creating a new folder to keep things organized.
   • We’ll create a new material and add a texture coordinate node, then apply any tileable texture (I’m using this Aura texture).
2. Tileable Textures on Different Meshes:
   • Tileable textures usually work fine on flat surfaces or boxes (e.g., 1.5 x 1.5), but on a cylindrical or disk-shaped mesh, issues arise. The UVs of the disk shape are straightforward, but problems occur when tiling the texture.
3. Understanding the Tiling Issue:
   • When the texture is applied to a disk mesh, the seams show at certain tiling values. For example, a tiling value of 1.5 leads to a half-tiled texture at the seam.
4. Fixing the Issue:
   • The key trick is to modify the texture coordinates.
   • We’ll subtract 0.5 from the X-axis, which shifts the coordinates, so the tiling starts from the center.
   • By doing this, we get a mirrored effect, ensuring there are no seams where the texture transitions.
   • Using abs will ensure that any negative values are converted into positive ones, making sure the tiling is seamless from the center outward.
5. Final Material Setup:
   • Apply the customized texture coordinates to the material using the Lerp node.
   • The Lerp node will blend between the standard texture coordinates and the adjusted ones to handle the tiling properly.
   • Use the tiling parameter to control the final texture repetition.
   • The result: no seams, just a clean, mirrored tiling effect that works across different mesh shapes.

Conclusion:

• This simple yet effective trick fixes texture tiling on cylindrical and other non-flat meshes. The key is adjusting the texture coordinates and using a mirroring approach.
• I’ll also provide the full material setup in the description below so you can replicate this trick.
• Thanks for watching, keep learning, and don’t forget to subscribe for more Unreal Engine tips and tricks!