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How to write a custom CAValueFunction (iOS)?

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New year, new question ;)

Speaking of iOS: I'm in the necessity to write a custom CAValueFunction (that computes a CATransform3D from an angle). The pre-defined functions are not sufficient, because I need to compute a product like
M[sub]1[/sub] * M[sub]2[/sub] * M[sub]3[/sub]
where just M[sub]2[/sub] is animated (by a kCAValueFunctionRotateY). A custom CAValueFunction would solve the problem smartly. However, it seems me from Apple's documentation, that writing a custom CAValueFunction is not wanted (by Apple, not by me ;)), because I can't find the description (of the API) how a value function works in detail. Has anybody here already done such a thing, please?

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