Description

This only happens when

1) Hair Width is very small. e.g. 0.01 in the example

2) Light has raytraced shadow and Samples Per Pixel has a value > 1. e.g. 8 in the example

The problem seems to be related with rasterization. r.HairStrands.RasterizationScale 0 workarounds ** it. If this is by design, it would be very helpful to reflect the parameter in the UI.

Steps to Reproduce

Open attached project to reproduce

Have Comments or More Details?

There's no existing public thread on this issue, so head over toAnswerHub just mention UE-94065 in the post.

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Unresolved
ComponentRendering - Ray Tracing
Affects Versions4.25
Target Fix4.26
CreatedJun 8, 2020
UpdatedJun 29, 2020