Hi everyone,

I’m trying to export a fluid simulation from Houdini to Unity using Labs Vertex Animation Textures 3.0 (Houdini 19.5)

Target: Unity URP
Export format: EXR / HDR (RGBA Half in Unity)

the problem:
when I bring the VAT textures + mesh into Unity and assign them to the VAT shader, the geometry looks completely scrambled and unrecognizable. It’s not just a shading glitch - the mesh itself looks shredded, like the vertex positions are changing per-frame in the wrong space.

what I’ve tried so far:
- exporting textures as HDR EXR (RGBA Half/Float) - no luck
- I suspect this may be related to VAT3’s bounding box normalization, since fluids with dynamic remeshing change bounds every frame. In older VAT versions there was an “Export Bounding Box” toggle, but in VAT3 it seems internal and I can’t override it. i did export it a version with Bounds SOP but no luck either.
what’s the correct way in VAT3 to stabilize the bounding box for a dynamic fluid sim so Unity interprets the frames consistently? or is there something else specific to VAT3 fluids I’m missing?

attached is the imported simulation preview in Unity.

any help would be greatly appreciated!