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Can I control falloff of Specular highlights on Mobile ES2?


I have noticed that the default specular level in mobile seems to be maxed out. The specular material input has no effect on mobile so I cannot scale it back in anyway. I'm trying to match the default value on PC but there doesn't seem to be anyway to do that.

Any help?

This is the PC with its default spec of 0.5 alt text

And this is Mobile ES2 with its default spec setting. .. A bit blown out.

alt text

Product Version: UE 4.12
pcspec.jpg (37.8 kB)
es2spec.jpg (37.3 kB)
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asked Dec 06 '16 at 02:20 PM in Rendering

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avatar image TeamKingdom Dec 07 '16 at 02:12 PM

I tried this again with version 4.14 and now I do have some control over the spec on Mobile ES2. But not much. These images show mobile with settings of SPEC at 1 and SPEC at 0. alt text alt text

spec_1.jpg (115.0 kB)
spec_0.jpg (106.3 kB)
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1 answer: sort voted first

I know virtually nothing about mobile rendering, but the falloff issue is one of roughness rather than specularity. At least on desktop rendering.

Try setting the Roughness to 1.

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answered Dec 07 '16 at 07:45 PM

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avatar image TeamKingdom Dec 07 '16 at 08:19 PM

Thanks for taking the time to comment. I shouldn't have used the term "falloff", its misleading. Yes the roughness does handle the spread or falloff of the reflection but the spec setting controls the intensity of that result. The roughness setting seems to give the same results on both but if you set the spec to zero on pc shader model 5 then you have 0 reflection intensity. (Spec input in ue4 would probably be better named as reflection intensity)

Mobile settings seem to always have a high intensity, even at a zero setting.

avatar image Wilkes Dec 07 '16 at 08:21 PM

I see. Wish I knew more about mobile rendering to help you as this seems like a pretty bad problem.

avatar image TeamKingdom Dec 08 '16 at 04:45 AM

Guess I will Log it as a bug.

avatar image Institute Games Aug 23 '17 at 05:01 PM

TeamKingdom, did anything come of this, as I am experiencing this issue as well.

avatar image TeamKingdom Aug 24 '17 at 03:11 AM

Hi Card and Dungeon, The problem seems to have been fixed in my testing. I see you have also responded in this answer hub thread


The test I did in that thread (Create a material with 0 color, 0 spec and 0 roughness) seems to work OK. Spec response on ES2 or mobile matches the shader model 5 intensity. (The shape of the specular dot is different but the intensity does match.)

If you have a specific example you would like to share I would be happy to see if I can recreate your problem.

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