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specular highlights on translucent material

so i was looking for a way of having specular highlight on a cornea material of an eye, and it seems like no one asked this since 4.8 was out, but i still can't make any progress

what is the propper setup for that?

Product Version: UE 4.8
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asked Jul 14 '15 at 05:28 AM in Rendering

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Hey Razorfield,

UE4 4.8 now has an experimental feature that will create specular highlights on Translucent materials.

Steps to Recreate:

  1. Create a new Material

  2. Add a base color that will show specularity well, IE a saturated blue.

  3. Plug in a Constant value of say, .5 into specular.

  4. You can add a normal which usually works best, nothing too noise just enough to reflect the specular map.

  5. Change your material Blend mode to Translucent

  6. Scroll down under your Details > Translucency options and click the box for Screen Space Reflection

  7. Under that same Panel Change Lighting Mode to Surface PerPixel, this feature is experimental.

  8. Lastly by pressing the ~ key enter the command r.ForwardLighting 1

This will allow for specularity on the surface of a translucent material.

Enjoy, Logan

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answered Jul 14 '15 at 02:05 PM

avatar image Melvin Eng Dec 16 '15 at 11:00 AM

Hi Logan,

I did the exact same steps you described, but it didn't work. My translucent material still stays the same as it was, merely see-through without any specular reflection whatsoever. Am I missing something still? FYI I'm using v4.9.1.

Regards, Melvin.

avatar image Logan Bailey ♦♦ STAFF Dec 16 '15 at 02:47 PM

Hello Melvin,

Are you sure you entered r.ForwardLighting 1. You will only see a black material before you do.

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avatar image Melvin Eng Dec 17 '15 at 02:11 AM

Hi Logan,

Well yes I did. Anyway I finally managed to enable it. Apparently temporal AA needs to be enabled too.

Cheers :-)

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