Scene's Alpha channel has no data(is pure white) on devices running iOS 6+

Unity Engine
1

Hello,

I am trying to create an image effect where i need data from the scene’s alpha. I have the information I want on a device running iOS 5. This information is the same if i set the scenes view mode to alpha, which is perfect. However on a device running iOS 6, this alpha is just plain white. Does anybody know why this is? is this a technical limitation or a bug?

Thanks

2

Are you using a 32-bit display buffer?

3

Yes we are using a 32 bit display buffer.

4

Has anybody else noticed this issue?

5

This bug/issue can be confirmed by using the glow image effect that comes with the other image effects in the pro assets pack. It seems to happen only on devices running ios 6 and higher.

6

We have been using the alpha channel of the 32-bit display buffer since iOS 6 was released, without the issue you’re seeing. You should report bug if it’s as easy as it sounds to reproduce.