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Mobile Preview Render Error [4.7.3]

Does anyone know why my models have this pretty hardcore render errors on the mobile preview? I yet didn't test if it's the same error once you play it on a mobile device, but I guess so...

Standalone Preview: alt text

Mobile Preview: alt text

Product Version: Not Selected
unbenannt.png (731.9 kB)
unbenannt1.png (727.2 kB)
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asked Mar 21 '15 at 01:33 PM in Bug Reports

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avatar image [Epic] Gribbs ♦♦ STAFF Mar 23 '15 at 05:05 PM

Howdy Skullwing,

Thank you for reporting this issue that you have been seeing, I am going to need a bit more information before I begin looking into what may be occurring. Have you seen the same errors in previous builds of UE4? Would you be using a source build or a binary build of UE4? If possible, would you be able to test the outcome on a mobile device and see if is similar?

Any additional information would be greatly appreciated. I am not sure if you have read this page before or not, but it has some guidelines to follow for mobile devices: https://docs.unrealengine.com/latest/INT/Platforms/Mobile/Performance/index.html

Thanks and have a great day!

avatar image Skullwing Mar 23 '15 at 11:06 PM

I am using the binary build of UE4 downloaded from the Launcher. I nerver tried to use this specific models in a previous version of UE4, it seems to me that this only happens to models with a high amount of polygons. The outcome on a mobile device was as expected, the same error like in the preview and on level change once I had the three meshes in the level, the game crashed on the mobile device.

All in all it might have something to do with the polygon count, but I am not sure.

avatar image [Epic] Gribbs ♦♦ STAFF Mar 24 '15 at 03:43 PM

Hey Skullwing,

What would be the poly count of those models that are causing the errors in your project?


avatar image Skullwing Mar 24 '15 at 07:50 PM
  1. Mesh: Triangles: 541.932 Vertices: 283.320

  2. Mesh: Triangles: 685.552 Vertices: 1.256.664

  3. Mesh: Triangles: 245.304 Vertices: 124.948

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1 answer: sort voted first

On most devices we only support 16-bit index buffers, so that would mean 64k indices. However, on Metal enabled devices (iPhone 5s, iPad Air, iPhone 6, iPhone 6+) we support 32-bit index buffers. If you were to try this on one of those devices, I suspect it would look correct and on the others to look like the mobile preview.


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answered Mar 25 '15 at 01:36 PM

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Ravlek STAFF
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avatar image Skullwing Mar 25 '15 at 02:08 PM

Thanks for the information! So on most android devices the number of polygons is limited to 64k?

avatar image [Epic] Gribbs ♦♦ STAFF Mar 25 '15 at 02:58 PM

64K is referring to the number of vertices that android devices are limited to.

avatar image Skullwing Mar 25 '15 at 07:04 PM

ok, thank you!

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