Unreal Engine 5, Niagara Read/Write to RT same frame?

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#1

I’m trying to make this shader sim inside Unreal Engine using Niagara.

I managed to get it working by implementing the shader code in a custom HLSL node and saving the results from 1 RT to a second RT and running the same logic in a second stage but flipping RT 1 and 2 around.

However, I think the solution itself is designed to work with one buffer or rather one RT since it uses channels R and G in replacement of two buffers.

But trying to do it with one RT in Niagara doesn’t work. I just see a green dot, no fluid sim.

Anyone know what may be going wrong?

#2

Pretty sure Niagara compute has protections in place to stop users from reading and writing to the same buffer, since that could cause some wacky stuff.

#3

I wasn’t getting the ensure until after an editor restart.
Now I’m aware of the issue but I learned that it shouldn’t be an issue as long as you are doing it on the same pixel so I may be able to get away with it?

Otherwise I guess I’m forced to use a Grid2D.