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In this Unity tutorial you’ll learn how to sample texture data from within your C# scripts and do something based on the sampled result. Specifically today we’ll be using the grayscale value of the colors to choose a weighted random pixel. Once we know that we’ll be updating a virtual texture on a SpriteRenderer to show us the bounds of where we were sampling and the specific pixel sampled each time.

Reading texture data in your scripts has a wide variety of applications in Unity. From Editor Scripting to show brushes, to runtime weighted bullet spread there’s as many options as you can come up with!

👨‍💻As always, all code from this video is available on GitHub: https://github.com/llamacademy/read-texture-data

📚 Resources
⚫ Get Pixels: https://docs.unity3d.com/ScriptReference/Texture2D.GetPixels.html
⚫ Get Raw Texture Data: https://docs.unity3d.com/ScriptReference/Texture2D.GetRawTextureData.html
⚫ Create Sprite: https://docs.unity3d.com/ScriptReference/Sprite.Create.html
⚫ Create Texture2D: https://docs.unity3d.com/ScriptReference/Texture2D-ctor.html

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Most tutorials come from knowledge gained making https://survival.llama.software Llama Survival – a top-down zombie survival shooter for Android and iOS.
I also have some Unity Assets: https://assetstore.unity.com/publishers/22409?_aid=1101l9QvC
Some links may be affiliate links, which at no additional cost to you, gives me a small portion of the purchase.

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Chapters:
00:00 Topic Introduction
01:30 Variables & Setup – SampleTextureOnClick.cs
02:48 Handling Click – SampleTextureOnClick.cs
03:03 Sampling a Texture with Weighted Random Grayscale – SampleTextureOnClick.cs
05:55 Mapping 1D Color Array to 2D Pixel Coordinates – SampleTextureOnClick.cs
07:16 Writing to a Texture – SampleTextureOnClick.cs
07:36 Become a Supporter
08:08 IMPORTANT Texture Settings & Demo
08:49 Performance Considerations