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Instanced stereo incorrectly renders distorted, black duplicate of debug rendering

If instanced stereo rendering is enabled, then all debug rendering is drawn twice - once normally, once distorted in black.

To reproduce: Open the VR template Open BP_MotionController Set the "GrabSphere" to no longer be hidden in game Compile and Save Play in VR Preview Notice that there is an extra Collision sphere that is shown (renders as black)

If you disable instanced stereo rendering, debug rendering renders correctly.

This was initially broken in 4.16 (and remained so in 4.16.1 and 4.16.2). Worked correctly in 4.15.

The bug UE-44947 is the same issue, however it says the issue is extra sphere collision being show and is associated with the VR template. The actual issue is all debug rendering being rendered twice, once correct, once black and distorted, when instanced stereo is enabled. The VR template provides simple reproduction steps, however the problem is not limited to collision geometry.

Product Version: UE 4.17 Preview
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asked Jul 13 '17 at 11:01 AM in Bug Reports

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Hello TurtleSimos,

You are correct, this is a known issue. There have been internal notes created, stating that this affects other things other than the debug sphere. Thank you for your additional information. I will be adding a link to the public tracker for future viewers.

Link: https://issues.unrealengine.com/issue/UE-44947

Make it a great day

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answered Jul 31 '17 at 05:39 PM

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Rudy Q ♦♦ STAFF
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