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Distance field shadow not work on masked material?

I am currently working on an exterior ArchViz project. For the sake of shadow quality, I use distance field shadow instead of cascade shadow. However, I encounter a problem with shadowing the masked material. I made single plane with 2 tris and a masked material to make grass. When I turn distance field shadow on, the shadow is still the shape of plane. The mask is not working. Here is the screenshot of cascade shadow map: alt text

The image below is with cascade shadow off, distance field shadow on: alt text

I have already turn on the two-sided mode in material, model and foliage setting. It still doesn't give me the masked shadow and shadows are flickering. I have tested on 4.11.2, 4.10.4. They all don't work. I also checked Kite demo, as I found that trees and debris are high detailed in model, they work just fine. Another thing is that I have speedtree models in my scene, the shadow of speedtree leaves works fine. Only grass doesn't work.

Product Version: UE 4.11
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asked Apr 20 '16 at 01:19 PM in Rendering

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