Incorrect rendering with metal

Hi,

I found some artefacts with UE4 when rendering using metal. More specifically, look at the following screenshot:

This is rendering on the device WITHOUT metal, and matches the mobile preview in the editor. The following, instead, is the same scene rendered on the device with metal enabled:

As you can see, there seem to be a problem with texture coordinates, but I don’t understand why. I am using UE4 4.8.1 on Mac OS X Yosemite, and the
device is an iPhone 6 with IOS 8.4.

The material applied to the wall is quite simple:

Also, in both cases (i.e. with and without metal), the sun of the BP_Sky_Sphere blueprint is rendered incorrectly, as a few moving dots:

Any help is appreciated, thanks!

Should I move the thread to the “rendering” forum? Or file a bug?

Hi rranon,
Check UV overlapping of 3d models in 3d soft. / no UV overlap, make all clean/ /just my ideas/
Sky_Sphere Not supported on iOS. /I think/

I’m not an expert, just an idea.