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Problematic Static and Stationary Lighting on Mobile

Hi, I built a simple scene targeting for Desktop/Console and now trying to run it on mobile. The scene is a closed tunnel and is lit by two 'long' static point light. With SM5 shaders, it looks like the picture below: alt text

However, after it's built for mobile (ES2), the two static light become really weird. The scene becomes darker and the light looks graded, instead of the continuous gradient with the SM4 shaders. The following is a screenshot of it: alt text

The problem remains when I change the two static lights into stationary lights. But if they are changed into movable light, they no longer look graded (and they are no longer 'long'). The following is a screenshot containing a movable point light and a static point light.

alt text

Anyone know why is it happening? The problem arises for both mobile preview and device.

Product Version: UE 4.14
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asked Feb 13 '17 at 07:18 AM in Bug Reports

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Yibing Lyu
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Hey Yibing,

So I ran some tests on my end and did not get the same results you are reporting. Below is a test case example I used to verify what you are reporting.

ES2 Preview

alt text

SM5 Level Preview

alt text

I would look at modifying your lightmap resolution for your static mesh object, and make sure the Source Length of the lights are not clipping into the geometry as it can begin to create shadowing artifacts.

Let me know if you have additional questions.

Thank you,

Andrew Hurley

es2-preview.png (285.7 kB)
sm5_example.png (525.5 kB)
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answered Feb 15 '17 at 04:45 PM

avatar image Yibing Lyu Feb 18 '17 at 11:44 AM

Thank you Andrew, my scene looks much better after making some changes according to your advice!

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