Mobile Preview Render Error [4.7.3]

Development Platform & Builds Mobile
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1

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:

35221-unbenannt.png
35221-unbenannt.png1060×612 577 KB

Mobile Preview:

35222-unbenannt1.png
35222-unbenannt1.png968×610 611 KB

2

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: Performance Guidelines for Mobile Devices in Unreal Engine | Unreal Engine Documentation

Thanks and have a great day!

3

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.

4

Hey Skullwing,

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

Thanks!

5
  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
6

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.

-Pete

7

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

8

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

9

ok, thank you!