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Question by solocs · Aug 06, 2021 at 10:55 PM · shadershadersrendertextureshader programming

How do I make a paint trail effect in ShaderGraph? Are there better ways?

Link to what I have so far: https://i.imgur.com/UzFUtrT.gif


Link to ShaderGraph of the original render texture: https://i.imgur.com/orlufI0.png Link to ShaderGraph of the output render texture: https://i.imgur.com/nUfYFu2.png


I'm trying to make the quad on the right leave a trail of cyan when the circle moves. Both squares use different materials.


I've tried using Graphics.Blit to draw the current texture onto a new one but it doesn't create any painting effect (code: https://hatebin.com/rlmjuzilmn).


The only progress I've gotten is from creating a RenderTexture and using SetPixel in a C# script but its very inefficient and slows down my computer too much: https://i.imgur.com/9617OYQ.gif


I've been going about this for weeks. What am I doing wrong? What are the other options I have?


I would like to avoid writing shader code if possible. I'm looking for relatively simple and easy to understand solutions.

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