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FSlateApplication::TakeScreenshot and -NullRHI ?

Dear community,

The context

We are a Machine Learning research lab using UE4 to generate a database of simple physical scenes. The objective is to train AI algorithms to learn the physical laws only by observation, as infants do.

For each frame of a scene we capture a screenshot, as well as depth and object masks, as PNG images. Here is an example of such a scene :

screenshot depth masks

The code works pretty well, and we now need to scale up to the industrial level. Indeed we need to generate many thousands of scenes. The idea is to run multiple instances of the game in parallel on a headless cluster by SSH. We are not interested by the realtime rendering, only by the captured PNGs.

The question

The screenshots are taken using FSlateApplication::TakeScreenshot (see our code here). But this is not working anymore when the game is launched with the -NullRHI option.

  • Are NullRHI and FSlateApplication::TakeScreenshot incompatible?

  • Is there another way than -NullRHI to launch the game without rendering it on screen?

  • Is there a better way than FSlateApplication to take a screenshot of the scene, that would work with -NullRHI?

Many thanks,

Mathieu

Product Version: UE 4.19
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asked May 28 '18 at 01:02 PM in Using UE4

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mmmaat
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