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Godot 4: Rainy window shader (tutorial)
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I watched it, very interesting effect, but one of the problems I have when trying to implement an effect is understanding how to manipulate the color, in your case the magic was happening in the drop_layer function. How did you know that doing that calculation (I.e. the uv offset into the base texture) would look like a drip?
Thanks! The offset of UV coordinates works like refraction, localized to the corresponding cell of the defined grid. Without using a noise texture, such light refraction would be circular, similar to the magnifying glass effect. However, this approach creates slightly irregular shapes, which better simulate droplets on a window pane. If you reduce the drop_layer function to its absolute minimum, you should see the mentioned grid before the shaping and movement of the droplets.
Like this: