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The Blend coefficient (transparency) does not work on layers at present, although it works on individual objects.
Any reason layers on the iOS device do not work with this property?
If they cannot be used and if they have no purpose for iOS (I could not find any use), would suggest that you disable this property on layers in MMF's editor to avoid confusion.
To have this work for layers we would have to render the entire layer to an intermediate layer first and then back to the screen with the effect.
This takes quite a lot of memory I'm afraid and memory is sparse on the iOS devices. If it is really necessary we can maybe look into adding the feature with a performance warning in the documentation.
That would be great Andos.
Ideally we should let MMF warn us if we try to use the blend coefficient or effects on layers if implemented in this way. Even though it could be described in the documentation it would be easy to miss that detail and a user could end up scratching their head if it causes them memory problems on the iOS device.