Indeed I can use Extractor – but some effects in AE do not have an input for depth map.
For example, I can use Extractor to turn a layer into a greyscale depth map, then on another layer, I can apply Compound Blur or Camera Lens blur and specify my depth map layer to control the blur. But some effects like Depth Matte do not allow you to specify a different, greyscale depth map layer, but use the depth channel embedded in the RLA or EXR layer. But, it seems, AE is very fussy about what that layer is called – hence it not working initially, despite me politely asking C4D to name the channel correctly (a request that C4D completely ignored – presumably this is a C4D bug).
It’d be great, for effects such as Depth Matte, to be able to specify which channel you want to use as the embedded depth map (I think I already did a feature request for this).
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