I changed one number in my material. Suddenly the texture repeated everywhere. That’s when UV coordinates finally started making sense.
This post is part of my daily learning journey in game development.
I’m sharing what I learn each day — the basics, the confusion, and the real progress — from the perspective of a beginner.
On Day 76 of my game development journey, I explored UV coordinates and normal maps in Unreal Engine materials.
What I Tried
While working with materials in Unreal Engine, I noticed textures repeating across my mesh.
At first, I thought something was wrong with the texture itself. Then I started adjusting the Texture Coordinate node.
Changing those values immediately changed how often the texture repeated. But the behavior felt strange.
What Confused Me
Why does multiplying UV increase tiling instead of scaling the texture?
Why does dividing make the texture look bigger?
What do the colors inside a normal map actually represent?
Why are most normal maps purple or blue?
What Finally Clicked
The X and Y components of texture coordinates are called UV.
Texture UV space normally goes from 0 to 1 in both directions. If UV values go beyond 1, the texture repeats.
For example:
- UV range 0 → 1 → texture appears once
- UV range 0 → 2 → texture repeats twice
That’s why:
- Multiplying UV increases tiling density
- Dividing UV reduces tiling and makes textures appear larger
I also understood what normal maps actually do.
Normal maps store surface direction data using RGB channels:
- Red → X direction
- Green → Y direction
- Blue → Z direction (surface facing outward)
They don’t change geometry.
They change how light reacts to the surface. That’s why most normal maps appear purple or blue.
Practical Fix
- Add a Texture Coordinate node in the material
- Multiply UV values to increase tiling
- Divide UV values to reduce tiling
- Connect normal maps to the Normal input
- Check normal map compression settings
One Lesson for Beginners
- UV controls where textures appear on a mesh
- Texture repetition depends on UV scale
- Normal maps fake lighting detail without extra polygons
- Too much tiling creates obvious repetition
- Incorrect normal maps can break lighting
Understanding UV space is fundamental for environment materials.
Many visual issues in game assets come from incorrect tiling or UV scaling.
Normal maps then add detail without increasing polygon count — which is essential for performance in real-time engines like Unreal Engine.
Slow progress — but I’m building a strong foundation.
If you’re also learning game development, what was the first thing that confused you when you started?
See you in the next post 🎮🚀
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