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ARKit 4.18 preview 1 - official IOS 11 and XCode 9 - camera feed red?

Hi, I’ve managed to get ARKit working on official ios11 and xcode 9 using 4.18 P1 on iphone 6s however the camera feed now has a red tint to it, could any of the devs give any pointers in getting the camera to show as ‘normal’? Steps were: Creating an unlit 2-sided material using the ARKit Passthrough Camera node (Texture Y and const coord 0), using a regular camera component in my pawn and have enabled ‘Start in ar’ option from project settings. Thx.

Hello darinsmyth,

Thank you for reporting this issue. We’ll be investigating this issue and respond here if we need anymore information, which will likely lead to wanting you to create an Answerhub post for further correspondence.

No problem

Do you mind telling me how you got it to work?
I deleted the ARKitCamera and the texture, from 4.17.
In 4.18 I now export to iphone and run the app, but I see a white background instead of camera feed and can not move the camera…

-EDIT UPDATE This has now been updated after fixes below so the camera should now work fine!! Thanks to Skyphyr and Omigamedev
This gets ARKit camera working with ios 11 and xcode 9 official versions.

Install 4.18 Preview 1.
Create new project -> blank -> set it to mobile, no starter content, scaleable 2d/3d
Apple ARKit plugin should be enabled as default but just double check under plugins.
Setup IOS so your provision/certificate are present. Setup bundle display/name/identifier
Change minimum ios version to IOS 11, I’ve kept Metal v1.2, Frame rate lock to 60fps
Under Project settings enable ‘Start in AR’
Under Additional Plist data add this: <key>NSCameraUsageDescription</key> <string>This application will use the camera for AR</string>
Restart if prompted

Enable Show Engine Content and Show Plugin Content from the view options in Content browser
In your game world you should have a Directional Light (mine set to static)
Create a new Blueprint of type pawn and add a camera component to it. Go to the Camera component details->Rendering Features -> Post Processing Material, where it says Array click on the +, from the dropdown Choose ->Asset Reference, click on none, now in Browse type in ARKitCameraMaterial, select this.
Click compile
Now add this Pawn to your world at position 0,0,0
Build lighting if necessary.
Connect your iphone/ipad and Launch
Game should start with camera now functioning.

It works, just as you said. Thank you! And you may be “happy” to hear, that my camera display is also red.

Hi all,

So I’ve put together a fix for the red camera issue - not the most efficient way probably, but I didn’t want to spend too long on what will likely be a temp solution. Problem summary is the camera feed comes as YCbCr, Unreal pushes it through in two separate parts - that is, you need to look up the ARKit camera feed twice, setting one to Type Y, the other to Type CbCr, then you need to convert between the two.

The material setup is here (still not sure if Screen Position is ideal across all devices, haven’t looked at the sample to check yet).

ARKit-RGBCameraPassThroughMaterial.PNG

Then I’ve thrown together a quick material function to convert from YCbCr to RGB. That’s below.

YCbCrtoRGB-MaterialFunction.PNG

Once you’ve done this, just use that material as you would the other, and you’ve got RGB camera feed. I’ll paste the material function nodes below so you can hopefully copy paste, rather than having to rebuild.

Cheers,

Alan.



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   Begin Object Class=/Script/Engine.MaterialExpressionFunctionOutput Name="MaterialExpressionFunctionOutput_0"
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      MaterialExpressionEditorY=384
      MaterialExpressionGuid=91DD571A4E93BC8EF78D6499EA29AD34
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   End Object
   MaterialExpression=MaterialExpressionFunctionOutput'MaterialExpressionFunctionOutput_0'
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End Object
Begin Object Class=/Script/UnrealEd.MaterialGraphNode Name="MaterialGraphNode_93"
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End Object
Begin Object Class=/Script/UnrealEd.MaterialGraphNode Name="MaterialGraphNode_94"
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End Object
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End Object
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End Object
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   CustomProperties Pin (PinId=21834053423B75DB595B6588AF6676B4,PinName="B",PinType.PinCategory="required",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,LinkedTo=(MaterialGraphNode_108 21AFE7394573AEEA8B72AF83F02AF08D,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,)
   CustomProperties Pin (PinId=A7F679C64347AA7B679A53B720087A9E,PinName="Output",PinFriendlyName=" ",Direction="EGPD_Output",PinType.PinCategory="",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,LinkedTo=(MaterialGraphNode_101 A6F0CAFE48B78212CF4E15B8EB85F7FA,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,)
End Object
Begin Object Class=/Script/UnrealEd.MaterialGraphNode Name="MaterialGraphNode_101"
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   End Object
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      MaterialExpressionEditorY=480
      MaterialExpressionGuid=97F584B54F4AFB8861CA4A8D9B2F4FAA
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   End Object
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   NodePosX=880
   NodePosY=480
   NodeGuid=625EAF864E5B9554CBBD919F39719512
   CustomProperties Pin (PinId=A6F0CAFE48B78212CF4E15B8EB85F7FA,PinName="A",PinType.PinCategory="required",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,LinkedTo=(MaterialGraphNode_100 A7F679C64347AA7B679A53B720087A9E,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,)
   CustomProperties Pin (PinId=A64AF908463263FD1B4A77A2A7A5AAAB,PinName="B",PinType.PinCategory="required",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,LinkedTo=(MaterialGraphNode_113 69AB6E3140375791CCD7ADACC7DE6D0C,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,)
   CustomProperties Pin (PinId=6BE3D1F94B92CE440DAC66A0DA7102B8,PinName="Output",PinFriendlyName=" ",Direction="EGPD_Output",PinType.PinCategory="",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,LinkedTo=(MaterialGraphNode_91 8CC779BF40E56BF29AD78BAE93C05DE3,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,)
End Object
Begin Object Class=/Script/UnrealEd.MaterialGraphNode Name="MaterialGraphNode_102"
   Begin Object Class=/Script/Engine.MaterialExpressionMultiply Name="MaterialExpressionMultiply_2"
   End Object
   Begin Object Name="MaterialExpressionMultiply_2"
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      MaterialExpressionGuid=E1190E224BFF60C32B64AAB7DEC5C69C
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   End Object
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   NodePosY=640
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   CustomProperties Pin (PinId=B2DDD02C4D2766CFB1FE59BDC006749A,PinName="A",PinType.PinCategory="optional",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,LinkedTo=(MaterialGraphNode_117 0E92EB2D4A3225390A7020AE842091EF,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,)
   CustomProperties Pin (PinId=3B08E08F44413FFB5489A0AC327F7210,PinName="B",PinType.PinCategory="optional",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,LinkedTo=(MaterialGraphNode_103 4E0AFE684AA35E9C01D0EDBE43847B5D,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,)
   CustomProperties Pin (PinId=C6AD5E1546B691BB82D0668D99A71E8D,PinName="Output",PinFriendlyName=" ",Direction="EGPD_Output",PinType.PinCategory="",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,LinkedTo=(MaterialGraphNode_104 C53335AB4592BBABDE05D3895DF1356D,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,)
End Object
Begin Object Class=/Script/UnrealEd.MaterialGraphNode Name="MaterialGraphNode_103"
   Begin Object Class=/Script/Engine.MaterialExpressionDivide Name="MaterialExpressionDivide_3"
   End Object
   Begin Object Name="MaterialExpressionDivide_3"
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      ConstB=256.000000
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      MaterialExpressionEditorY=752
      MaterialExpressionGuid=D15ABA004ED2A1B968FA3385C07EAA9B
      Material=Material'/Engine/Transient.Material_8'
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   NodePosX=-160
   NodePosY=752
   NodeGuid=AA5119944C34B3E96665269BB7D3AFEA
   CustomProperties Pin (PinId=1166F5044EFBF4A87F3811962D2EB5B4,PinName="A",PinType.PinCategory="optional",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,)
   CustomProperties Pin (PinId=59F79A634307F7EAC07FA4A257B46520,PinName="B",PinType.PinCategory="optional",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,)
   CustomProperties Pin (PinId=4E0AFE684AA35E9C01D0EDBE43847B5D,PinName="Output",PinFriendlyName=" ",Direction="EGPD_Output",PinType.PinCategory="",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,LinkedTo=(MaterialGraphNode_102 3B08E08F44413FFB5489A0AC327F7210,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,)
End Object
Begin Object Class=/Script/UnrealEd.MaterialGraphNode Name="MaterialGraphNode_104"
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   End Object
   Begin Object Name="MaterialExpressionSubtract_1"
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      MaterialExpressionEditorY=608
      MaterialExpressionGuid=F202B5EE437029E32FB935BC79FC46FB
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   MaterialExpression=MaterialExpressionSubtract'MaterialExpressionSubtract_1'
   NodePosX=128
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   NodeGuid=FB40E12841A70E3A7057AB8D8252CD2E
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   CustomProperties Pin (PinId=C53335AB4592BBABDE05D3895DF1356D,PinName="B",PinType.PinCategory="optional",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,LinkedTo=(MaterialGraphNode_102 C6AD5E1546B691BB82D0668D99A71E8D,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,)
   CustomProperties Pin (PinId=EC17B65B40CF76BDB3E674AEFBA1774D,PinName="Output",PinFriendlyName=" ",Direction="EGPD_Output",PinType.PinCategory="",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,LinkedTo=(MaterialGraphNode_107 4A77C983454476B2C3EDE8879C41BC8E,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,)
End Object
Begin Object Class=/Script/UnrealEd.MaterialGraphNode Name="MaterialGraphNode_105"
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   End Object
   Begin Object Name="MaterialExpressionDivide_4"
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      ConstB=256.000000
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      MaterialExpressionEditorY=832
      MaterialExpressionGuid=444F34B142621AE8832CB69150902401
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   CustomProperties Pin (PinId=BA05EA4449034BB088698292AFA08528,PinName="B",PinType.PinCategory="optional",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,)
   CustomProperties Pin (PinId=37640F9B492C8E2819EBA69FAE8AE53B,PinName="Output",PinFriendlyName=" ",Direction="EGPD_Output",PinType.PinCategory="",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,LinkedTo=(MaterialGraphNode_106 4AA6BD654772D20F75CD1CB81A27B221,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,)
End Object
Begin Object Class=/Script/UnrealEd.MaterialGraphNode Name="MaterialGraphNode_106"
   Begin Object Class=/Script/Engine.MaterialExpressionMultiply Name="MaterialExpressionMultiply_3"
   End Object
   Begin Object Name="MaterialExpressionMultiply_3"
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      MaterialExpressionEditorY=736
      MaterialExpressionGuid=3F2A73B643EBC11E87A712856DA9A619
      Material=Material'/Engine/Transient.Material_8'
   End Object
   MaterialExpression=MaterialExpressionMultiply'MaterialExpressionMultiply_3'
   NodePosX=176
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   NodeGuid=D8404C934A7AB328B6064985EDFBC01A
   CustomProperties Pin (PinId=ABB91BA141085DC025ADA5A66FFA236C,PinName="A",PinType.PinCategory="optional",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,LinkedTo=(MaterialGraphNode_118 A24BFEA547414D2E5E2BED9631545B4D,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,)
   CustomProperties Pin (PinId=4AA6BD654772D20F75CD1CB81A27B221,PinName="B",PinType.PinCategory="optional",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,LinkedTo=(MaterialGraphNode_105 37640F9B492C8E2819EBA69FAE8AE53B,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,)
   CustomProperties Pin (PinId=7055E2A24FD00CC31D7BB7ACBB4D692D,PinName="Output",PinFriendlyName=" ",Direction="EGPD_Output",PinType.PinCategory="",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,LinkedTo=(MaterialGraphNode_107 BD79088040D98521815FCF8435910C80,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,)
End Object
Begin Object Class=/Script/UnrealEd.MaterialGraphNode Name="MaterialGraphNode_107"
   Begin Object Class=/Script/Engine.MaterialExpressionSubtract Name="MaterialExpressionSubtract_2"
   End Object
   Begin Object Name="MaterialExpressionSubtract_2"
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      MaterialExpressionEditorY=640
      MaterialExpressionGuid=E925B4E04022ABBC525371AF72AA0497
      Material=Material'/Engine/Transient.Material_8'
   End Object
   MaterialExpression=MaterialExpressionSubtract'MaterialExpressionSubtract_2'
   NodePosX=304
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   CustomProperties Pin (PinId=4A77C983454476B2C3EDE8879C41BC8E,PinName="A",PinType.PinCategory="optional",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,LinkedTo=(MaterialGraphNode_104 EC17B65B40CF76BDB3E674AEFBA1774D,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,)
   CustomProperties Pin (PinId=BD79088040D98521815FCF8435910C80,PinName="B",PinType.PinCategory="optional",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,LinkedTo=(MaterialGraphNode_106 7055E2A24FD00CC31D7BB7ACBB4D692D,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,)
   CustomProperties Pin (PinId=E5EC8C834D10271B5F8F6F84EFDC17FF,PinName="Output",PinFriendlyName=" ",Direction="EGPD_Output",PinType.PinCategory="",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,LinkedTo=(MaterialGraphNode_108 845060C744301483EB1520B53530F4DC,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,)
End Object
Begin Object Class=/Script/UnrealEd.MaterialGraphNode Name="MaterialGraphNode_108"
   Begin Object Class=/Script/Engine.MaterialExpressionAdd Name="MaterialExpressionAdd_1"
   End Object
   Begin Object Name="MaterialExpressionAdd_1"
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      MaterialExpressionEditorY=656
      MaterialExpressionGuid=4069AE8946740AB1BE347491717B6D1F
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      Desc="G"
      bCommentBubbleVisible=True
   End Object
   MaterialExpression=MaterialExpressionAdd'MaterialExpressionAdd_1'
   NodePosX=464
   NodePosY=656
   bCommentBubbleVisible=True
   NodeComment="G"
   NodeGuid=1845D56E4979AE1733F1FAB9D46F15B6
   CustomProperties Pin (PinId=845060C744301483EB1520B53530F4DC,PinName="A",PinType.PinCategory="optional",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,LinkedTo=(MaterialGraphNode_107 E5EC8C834D10271B5F8F6F84EFDC17FF,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,)
   CustomProperties Pin (PinId=33013B114CE300545BA94B8D1EC49274,PinName="B",PinType.PinCategory="optional",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,LinkedTo=(MaterialGraphNode_109 9AE3F07441B67B0B13EF8CBC3617AF1F,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,)
   CustomProperties Pin (PinId=21AFE7394573AEEA8B72AF83F02AF08D,PinName="Output",PinFriendlyName=" ",Direction="EGPD_Output",PinType.PinCategory="",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,LinkedTo=(MaterialGraphNode_100 21834053423B75DB595B6588AF6676B4,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,)
End Object
Begin Object Class=/Script/UnrealEd.MaterialGraphNode Name="MaterialGraphNode_109"
   Begin Object Class=/Script/Engine.MaterialExpressionDivide Name="MaterialExpressionDivide_5"
   End Object
   Begin Object Name="MaterialExpressionDivide_5"
      ConstA=135.576004
      ConstB=256.000000
      MaterialExpressionEditorX=352
      MaterialExpressionEditorY=768
      MaterialExpressionGuid=40B80AAD41098F157E8443816E90CE02
      Material=Material'/Engine/Transient.Material_8'
   End Object
   MaterialExpression=MaterialExpressionDivide'MaterialExpressionDivide_5'
   NodePosX=352
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   CustomProperties Pin (PinId=918F5A4048B4D79418ED88AABD4AD838,PinName="A",PinType.PinCategory="optional",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,)
   CustomProperties Pin (PinId=9420115F4005A20542C355BF51B1198B,PinName="B",PinType.PinCategory="optional",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,)
   CustomProperties Pin (PinId=9AE3F07441B67B0B13EF8CBC3617AF1F,PinName="Output",PinFriendlyName=" ",Direction="EGPD_Output",PinType.PinCategory="",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,LinkedTo=(MaterialGraphNode_108 33013B114CE300545BA94B8D1EC49274,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,)
End Object
Begin Object Class=/Script/UnrealEd.MaterialGraphNode Name="MaterialGraphNode_110"
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No sure if you have noticed it but if you enable Engine and Plugins content in your Content Browser there’s a handy ARKitCameraMaterial which comes with a nice color conversion node as a matrix mul which is faster than that huge network.
This material is set as a PostProcess material so I guess it’s made to be used as a camera post process, so if you select your camera in the Pawn->Camera->Details->RenderingFeatures->PostProcessMaterial->Array and create a new element and select AssetReference then select the ARKitCameraMaterial.

It seems to work, except one thing: the FOV of the Pawn->Camera is set to 90 but the iOS camera is clearly not 90. In the code there was a blueprint function that they removed from 4.17 and made everything private in C++ (■■■■ it). Do you guys get the right behaviour?

Ahhh - perfect, thanks. They also bothered with the sRGB to linear conversion that I hadn’t done. :slight_smile: Applying it as a post process means it blitzes everything in the scene (i.e. you only have camera passthrough, none of your objects), but grabbing their cleaner implementation is great.

As far as the FOV, I’ve not gotten far enough to see whether I’m getting correct behavior or not. I’ll let you know if I don’t :slight_smile:

Cheers,

Alan.

It seems like setting the FOV to 60 makes it look better. Let’s hope they will fix this, but 60 is way better than 90. I’m trying to make it spawn some cubes on touch, but even thought I spawn them I can’t see them.

I was working on something like that last night using two arkit passthrough nodes and combining the Y and Cbcr base on this apple documentation:
https://developer.apple.com/documentation/arkit/displaying_an_ar_experience_with_metal

So didnt even think of searching the engine and plugin folders! Gonna give it a try now, thanks for the input!!

Thanks for pointing this out!!! Going to give it a try now

I keep testing and I just found out that there’s no need for the material, if you remove all the backgrounds (sky and box) and you leave the black it will be filled with the video feed automatically, but to me it looks quite dark, not sure why.

Yeap, no need for box with video background as previous steps in 4.17, so it seems you only need the material added to the camera post processing so i’ve updated the step above. Are you noticing flickering on lighter surfaces?

After i install 4.18p1,why i cannot see the applearcamera in the component list?

I have the same problem. Did you fix this?

** Found solution **
I had to “Fix up redirectors in folder”. Maybe it will also help you.

You do not use AppleARKitCamera in 4.18 p1, it has been removed, you just use a standard Camera component

i have the same issue too…
is there a guide on how i can spawn actors on touch in 4.18?since many ar specific nodes disappeared from 4.17
thanks a lot!

Sure.
There is a handy video on YouTube. (Getting Started With ARKit In Unreal Engine 4 - YouTube) It shows, how to spawn actors at around 12:19. Even though it was made with 4.17, it’s still usable. I attached how I did it in 4.18 preview1.

thanks for the reply.actually i have tried this, almost the same blueprint, but after i install the project on my iphone7p,if i touch on the screen nothing spawns actually.but i’m sure the nodes get called because the print string works after the trace success…i really don’t know what i’m missing…