I love the smell of UnrealEd crashing in the morning. – tarquin
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This UV node generates texture coordinates in view space centered on the particle system's MacroUVPosition, with tiling controlled by the particle system's MacroUVRadius. It is useful for mapping a 'macro' noise texture in a continuous manner onto all particles of a particle system.
Property group 'MaterialExpressionParticleMacroUV'
Whether to calculate the UVs in View space, which gives a slightly different UV position based on depth and creates a parallax effect, at the cost of texture swimming.