Failed to get Depth info by SceneCapture2d on Mobile Devices

Development Platform & Builds Mobile
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Failed to get Depth info by SceneCapture2d on Mobile Devices.

I tried to use a SceneCapture2d to capture a the depth of a scene.

the Capture source is set to be “SceneDepth in R”, and the format of the target texture if RTF_R16f.

It works all right on PC except for some MSAA problems.

But on both android and ios mobile devices, the captured render target turns out to be all black.

Any clues for this problem? waiting online.