Alpha channel issues iOS

Hello Everybody,

When working on cross platform project (PC-iOS) we encountered an issue with the embedded Alpha channel in the diffuse map.

The alpha channel is vital for controlling the specular levels and works as it expected (on PC).

Unfortunately opening such materials on iOS results in viewport artefacts.

Is there any limitations regarding reflection materials and specular alpha in iOS?

Generally speaking, we found a degradation when moving from PC to iOS.

We appreciate if one can point us the right direction (again, when moving from PC to iOS)

Thanks!