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[BUG] Cannot draw to RT on Android


I have a very bad bug with DrawMaterialToRenderTarget function in UE 4.22. It not draws anything to render target on Android build.

My setup: I take hit result under finger by channel, make simple line trace according to it, and pass all this as point damage to hit actor. alt text

In hit actor I get collision UVs from hit, and pass them as coordinate to my material. alt text

All of this works in editor and in game. I can draw on plane mesh with it and everything is fine.

But after update to UE 4.22 (with android works R7) it won't work in development or shipping packaged build on devices.

Initially I had similar problem with previous UE4 versions, but after I set render target format to RTF_RGBA8 everything fixed. For now I tried to package with ALL render target formats and nothing.

I didn't find any problem in line trace or find collision UVs logic.

I also tried to switch to "draw canvas to render target" flow, and it also works in editor, but not on device.

Any ideas? Thanks!

Product Version: UE 4.22
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asked May 08 '19 at 02:55 PM in Using UE4

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4.3k 81 17 104

avatar image redbox May 09 '19 at 08:42 AM

I've submit bug report to support.

Example project link text

rtandroid.zip (1.4 MB)
avatar image redbox May 09 '19 at 09:09 AM

Everything works fine with MobileHDR enabled on ES2 or ES3.1.

avatar image UnexpectedSquirt Jun 01 '19 at 12:01 PM

Hey man thanks for submitting that bug report!

Hopefully this gets fixed soon! I really don't want to use Mobile HDR (I'm doing a VR project and performance is crucial!)

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