I’ve been using Grid2D’s SamplePreviousGridFloatValue in Unreal Engine v5.5.4 (DirectX) in Niagara in ParticleUpdate and I’ve been getting valid values out of it. It’s also working under Meta’s UE fork v5.5.1 (DirectX).
It seems to be working now?
I’ve been only fetch single-value floats so far, and I did initialize a matching size of the grid vs my render-target. I did not bind the Grid2D to the render-target as the option has in SetParameter as that clears my RenderTarget to (0.5, 0, 0, 0) (RGBA).