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VAT - Niagara triggering twice
Hi everyone,I recently worked through the new version of the Vertex Animation Textures tutorial from SideFX for Unreal (link to tutorial), and I came across an undocumented issue that was hard to pin down. After much troubleshooting, my colleague Michael Hall and I discovered a workaround, which I hope will save others time and frustration.The Issue: The problem we encountered was a double-triggered animation effect when running the Vertex Animation Textures in Unreal Engine Through Niagara. Heres how we solved it.Solution Steps:In Your Base Material:Place a RemapValueRange node.Add four Constant variables to the node.Convert one of the constants to a Parameter and name it something descriptive. I used NumberofFramesFromHoudini, representing the number of frames in your vertex animation set up in Houdini or another software.Add a Dynamic Parameter Node:Drop in a Dynamic Parameter node and give it a name to track.Set Up in Niagara:Within your Niagara System, place a Dynamic Material Parameters module.Switch from a Float Interface to Float From Curve.Make sure to flip the curve from (0.0, 0.0) to (1.0, 1.0)Finally, set your Niagara System and emitter to Once to avoid double-triggered animations.We wanted to share our findings here to help anyone encountering the same issue,I hope this helps. Let us know if youve found additional workarounds!
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