Get Mesh Distance Field in Niagara

Development Rendering
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1

I am trying to generate Particles inside a mesh in Niagara, like this official tutorial mentioned at 41:53 https://youtu.be/31GXFW-MgQk?si=T9BZOmSiuNsTJm5j&t=2513

I know I need to query Mesh Distance Field in Niagara, but the result is just not Valid. Partciels are red which means the Query Distance Field always returns IsValid = false.

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Could someone give me a hint about how to correctly sample Mesh Distance Field in Niagara? Thank you in advance. :grinning_face:

My Project Settings:

  1. Generate Mesh Distance Field is On

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  2. Niagara - Allow Distance Fields is On

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  3. Niagara System is running on GPU

  4. Mesh Distance Preview is like this, and soft shadowing works.

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2

Solved with the assistance of ChatGPT and previewing MDF: Make sure Mesh Distance Field exists in GPU.

You need to use Source / Attached Parent mode for your static mesh, and set it by a blueprint. Otherwise the mesh data does not exist in GPU, so Query Mesh Distance Field returns invalid.

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A side note: Mesh with Translucent material does not have mesh distance field, try using Masked.