Epson BT-2000 Developers Guide - Page 87

The camera mode is set to edof or depth-only mode.

Page 87 highlights

 Notes:  To use the depth information application, you need to describe the process in onDepthMap.  To execute onDepthMap, you need to meet all of the following conditions. (1) The camera mode is set to edof or depth-only mode. (2) startPreview is executed. (3) startDepthStreaming is executed. (4) A callback method is registered in setDepthCallback.  For edof mode, you can execute depth information acquisition, preview display, and preview data acquisition at the same time.  For depth-only mode, preview display is unavailable. To display depth data, you need to convert the data format to image format to display images. MOVERIO Pro Developer's Guide (Rev.1.0) 83

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MOVERIO Pro Developer's Guide (Rev.1.0)
83
Notes:
To use the depth information application, you need to describe the process in
onDepthMap.
To execute onDepthMap, you need to meet all of the following conditions.
(1)
The camera mode is set to edof or depth-only mode.
(2)
startPreview is executed.
(3)
startDepthStreaming is executed.
(4)
A callback method is registered in setDepthCallback.
For edof mode, you can execute depth information acquisition, preview display,
and preview data acquisition at the same time.
For depth-only mode, preview display is unavailable. To display depth data, you
need to convert the data format to image format to display images.