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[Rendering] Modulated shadows do not combine correctly on mobile

I just enabled modulated shadows on mobile and noticed that they are not combining correctly.

For instance, in the reference below, I have a character with an attached mesh and the two shadows do not combine correctly.

Expected result: The player shadow and the bat shadow should be the same tint

Actual result: The player shadow and the bat shadow are different values

Test platform: Samsung Galaxy S6

alt text

Product Version: UE 4.9
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asked Oct 14 '15 at 09:09 AM in Rendering

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BenRetan
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avatar image svv3dUDN Oct 14 '15 at 09:13 AM

Modulated Shadows is a old shadows from UE3/UDK.

https://udn.epicgames.com/Three/ModulatedShadows.html

avatar image BenRetan Oct 14 '15 at 09:15 AM

As far as I am aware, this is a new feature in 4.9 (for mobile devices)

See the 4.9 release notes here: https://www.unrealengine.com/blog/unreal-engine-49-released

Under the section "NEW: DYNAMIC CHARACTER SHADOWS FOR MOBILE"

I am referring specifically to the section that says "To enable this feature, turn on the "Cast Modulated Shadows" option on a directional light!"

I have added a "mobile" tag to this question to make sure that people are aware that this is a mobile specific question

avatar image svv3dUDN Oct 14 '15 at 09:17 AM

Yes it is new feature for UE4 but limitations is same.

avatar image BenRetan Oct 14 '15 at 09:21 AM

I'm not sure what you mean by "limitations is same".

In PIE, under the Selected Viewport and the Mobile Preview option for the game, the attached object (in this case, the bat) do not render shadows. The expected result however is that they would render correctly.

On device (Samsung Galaxy S6), the shadows are rendered but not combined correctly, as shown in the screenshot above.

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Hi Ben,

I got an update on this one. This is actually a limitation of Modulated Shadows. Since this is a newer feature there isn't a lot of documentation out there other than the older UDK page.

We will have a new documentation page up soon with some information on this implementation in UE4 along with limitations and other details related to the feature.

Tim

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answered Oct 21 '15 at 02:12 PM

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Tim Hobson ♦♦ STAFF
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Hi Ben,

As svv3dUDN mentioned this is a limitation at the moment with a newer feature. I've got ahead and entered a ticket for this with UE-22184.

I want to preface that this may be a limitation of the modulated method for mobile and may not be resolved in the near future or at all. Once there is an update for the ticket I'll post back here with any relevant information.

Thank you!

Tim

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answered Oct 15 '15 at 06:22 PM

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Tim Hobson ♦♦ STAFF
48.8k 887 101 878

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