Large World Coordinates appears to not work for Niagara Mesh Particles

When a Niagara System is placed at around 10^8 units away from the origin, the movements of the mesh particles aren't smooth as expected, but jumpy. These particles behave as if they are using a float vector to represent position, instead of LWC vectors.

We furthermore have two additional insights:

• The issue appears to not exist in UE5.3, but does exist in UE5.4 and UE5.5.
• The issue only appears when global shaders are optimized. When r.Shaders.Optimize is set to 0, the particles behave as expected.

This issue appears to be caused by reassociation performed by the compiler on float4x4 DFMultiplyTranslationDemote(FDFMatrix Lhs, float3 Rhs) in DoubleFloat.ush:375.

Create a new Niagara System using the Empty Emitter template as a base, then modify as follows:

• Add Spawn Rate Module to Emitter Update, and set SpawnRate to 5.0,
• In Initialize Particle Module, set Sprite Size to Uniform 0.5, and Mesh Size to Uniform 0.1,
• Add Add Velocity Module to Particle Spawn, and set Velocity to (5.0, 0.0, 5.0),
• Add Solve Forces and Velocity to Particle Update
• Add Mesh Renderer to Render

Set the location of this system to (99999990.0, 0.0, 0.0), and observe the behavior of the mesh particles, relative to the sprite particles.

[UE-23848] Bug Status

i have this problem UE4CC-Windows-58DC12AF4B97F057BD108FBFF569B2E9_0000

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