Solid looking translucent material for fade outs.

Development Rendering
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1

Hey, so just got back from the Epic Meet and Greet at Portland, and was talking to Maury Mountain, the super awesome art lead, about how currently, translucent materials, even if you set their transparency to completely opaque, can still be seen through and do not work correctly with shadows and such (they look like a glowstick, even without anything plugged into emissive). He suggested I pop this question up on the answer forums with an example of what I would like it to look like. Unfortunately, I cannot make a video file small enough (1/2 a MB) to put onto this forum, so I will give the link to 2 videos with the effect, and the time stamp of where the effect happens. Video 1 is of diablo 3, and video 2 is of diablo 2.

Video 1: Diablo 3 Reaper of Souls - Fire Starter Crusader (Torment VI) - YouTube
Effect is the cave arch over the head of the character fades away. Timestamp: 1:11

Video 2: Diablo 2 (Co-Op) Ep.27: Storming the Castle - YouTube
Effect is the side of the wall that fades away when the player enters the building. Timestamp: 2:49

2

You could try the DitherTemporalAA function in combination with a masked instead of translucent material. This will give you proper opaque lighting with a smooth, though slightly noisy transition.

3

You can use Translucent blend mode with lightning mode Surface ForwardShading but at the cost of a real performance impact. It depends of what you want to do.