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SceneTexture:CustomStencil emits only zeroes on 4.18.2 Mac Sierra+Metal

I create the following test project with one map "TestMap". I enable depth stencil pass "enabled with stencil" in project settings. I create one large cube, custom depth pass enabled, customdepth 201. I create an infinite extent postprocess volume. I assign it a custom material DebugMaterial, which looks at SceneTexture:CustomStencil and displays green if R is 0 and DebugFloat4Values on the CustomStencil value otherwise. Here is the project:

link text

I test this on two machines.

Machine 1:
Laptop, Windows 10 version 1709 with Unreal Editor 4.18.2. Laptop with "display scaling" enabled. Lists its video card[s] as "Intel(R) HD Graphics 630" and "NVIDIA GeForce GTX 1060".
Looks good.

alt text

Machine 2:
Mac OS X 10.12.6 (16G29) with Unreal Version: 4.18.2-3794801+++UE4+Release-4.18 . Retina macbook. Lists its video card as "Intel Iris Graphics 6100 1536 MB". I believe the editor runs with Metal because I've seen it in stack traces and when I do standalone mode I see SF_METAL_SM5 in the window title. Result:
I get only green [value 0].

alt text

Another weird thing: If I switch into Buffer Visualizer->Custom Depth mode, then switch back to "Lit", I get a freeze frame of the cube with the debug values printed over it as expected, except that (1) the debug numbers are the nonsensical value "600", and (2) it does not "animate", if I move the camera it remains frozen. I don't know what this means.

alt text

Additional notes:
I have filed a separate bug about "buffer visualization->custom stencil" not working as expected, again on 4.18.2 mac. https://answers.unrealengine.com/questions/739638/buffer-visualization-custom-stencil-does-not-anima.html

Expected behavior:
Custom stencils should work on OS X Metal. This older answer https://answers.unrealengine.com/questions/300521/customstencil-not-working-on-mac.html implies it worked in 4.11.

If for some reason custom stencils don't work on Mac, or don't work with certain video cards or something, this should be clearly documented, and the editor should display whatever helpful warnings are needed when running in Metal mode instead of just emitting garbage values.

Product Version: UE 4.18
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asked Dec 25 '17 at 11:42 PM in Bug Reports

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avatar image DesperateZero Dec 26 '17 at 03:22 AM

The bug I found is bit mask not work on metal or open es.I had reported it but no response.

avatar image sytelus Dec 29 '17 at 01:44 AM

This is causing issue in AirSim as well. Related bug: https://github.com/Microsoft/AirSim/issues/702

avatar image mcclure111 Jan 05 '18 at 05:09 AM

Update: I upgraded to High Sierra 10.13.2 (17C88) (and XCode 9.2). This issue appears to be fixed in High Sierra. I get the same behavior in High Sierra I get on Windows. However, given that this bug appears to affect compiled software, not just the editor, this still seems to be a problem. Shipping games running on Sierra could silently work incorrectly and this could be difficult to debug.

avatar image Jon X ♦♦ STAFF Feb 16 '18 at 04:29 PM


We've recently made a switch to a new bug reporting method using a more structured form. Please visit the link below for more details and report the issue using the new Bug Submission Form. Feel free to continue to use this thread for community discussion around the issue.



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