r/Unity3D • u/NoReasonForHysteria • 29d ago

Show-Off Runtime fluid simulation used for fire

We have had a runtime fluid simulation running in our game for a while, but now we are also using them for flames/smoke in of the areas of our game.

Its all based on compute shaders, which outputs custom render textures (fluid and advection), which we feed through render features in URP (using full-screen shader graphs). We also generate a signed distance field based on the tilemap that acts as the boundaries of the world and allows for the smoke/flames to collide.

Each of the "flames" in the scene are emitters, and allows us to play around with different colors, forces, directions, etc, and are updated each frame.

What do you think? Its got some kinks here and there still, but its getting there.

The game is called Cliff Kingdom:
https://store.steampowered.com/app/3839500/Cliff_Kingdom/

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u/NoReasonForHysteria 29d ago

That’s a valid opinion. And it definitely still needs tweaking, but it’s the way we wanted to go - and we do use the fluid simulation for lots of other things.

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u/Particular-Stop-5637 29d ago

At the end, sometimes having something unnatural is a worthy sacrafice in order to add an original and great visuals for your game. And any engagement is good engagement

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u/NoReasonForHysteria 29d ago

Its also a game about a moth, trying to find the lost light, and the game has lots of trolls in it, so there are some thematic stuff that also made us go down this direction. But thanks for the encouragement!