World UVs creating glitchy lines.

bostonDownamics · December 13, 2020, 6:13pm

I’m following a tutorial by Tom Looman, and he gives a project to use in the lesson. This project is just the first person template with a few alterations, one of these alterations is a material that uses UVs to project white on top and orange around the object.

The problem is that the material function that he uses to calculate the projection is giving me lines that glitch around the object when I move my camera.

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This is the function that he used to calculate the UVs.

And the paste bin for the function to simplify your life if you want to test it:

If anyone has any idea of what this could be any help would be nice. Thank you for your time.

MostHost_LA · December 14, 2020, 5:11am

Shot in the dark. Temporal AA ?
filming the behavior would help.

bostonDownamics · December 14, 2020, 5:43pm

I changed the Temporal settings in the project editor, but the glitching is still present.

I also got a gif to show the effect

ezgif.com-optimize.gif

There are these stripes around the object but not on top or bottom, I was curious if this is a problem with 4.25 because with 4.17 this glitch didn’t show.
I tried to comb trough the options in the material function testing each one.
.

Arkiras · December 14, 2020, 6:16pm

I’ve noticed that there seems to be some sort of precision issue with the certain nodes where it will flicker back and forth between values like it can’t determine which is correct, I most commonly notice this pixel flickering issue with the Frac node. In your case, I believe it is caused by Floor, probably because you’re previewing it on a cube where all the axis are aligned, if you rotate it even a little bit then the flickering will disappear.

Anyway, I have just been working around the issue, which can be done in your case.

Currently you’re doing Floor(Abs(PixelNormalWS[G]*2))

If you replace that with: Round(Abs(PixelNormalWS[G]))

It should work correctly.

Paste code:


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CustomProperties Pin (PinId=5D2C2C4A4E636E73F303EC9CB146F856,PinName="Input",PinFriendlyName=NSLOCTEXT("MaterialGraphNode", "Space", " "),PinType.PinCategory="required",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,PinType.bIsUObjectWrapper=False,LinkedTo=(MaterialGraphNode_70 51D815E64A6B9415A476D9B1E1A756FC,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,)
CustomProperties Pin (PinId=F9771D5441F17B6ECD6F0C8537035621,PinName="Output",PinFriendlyName=NSLOCTEXT("MaterialGraphNode", "Space", " "),Direction="EGPD_Output",PinType.PinCategory="",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,PinType.bIsUObjectWrapper=True,LinkedTo=(MaterialGraphNode_24 761EBD734A304BDD76A8CCB18136135B,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,)
End Object
Begin Object Class=/Script/UnrealEd.MaterialGraphNode Name="MaterialGraphNode_19"
Begin Object Class=/Script/Engine.MaterialExpressionDivide Name="MaterialExpressionDivide_6"
End Object
Begin Object Name="MaterialExpressionDivide_6"
A=(Expression=MaterialExpressionLinearInterpolate'"MaterialGraphNode_9.MaterialExpressionLinearInterpolate_7"')
B=(Expression=MaterialExpressionFunctionInput'"MaterialGraphNode_20.MaterialExpressionFunctionInput_0"')
MaterialExpressionEditorX=-144
MaterialExpressionEditorY=400
MaterialExpressionGuid=3467066F4D7F03C7AAB6ABB804E2436A
Material=Material'"/Engine/Transient.Material_3"'
End Object
MaterialExpression=MaterialExpressionDivide'"MaterialExpressionDivide_6"'
NodePosX=-144
NodePosY=400
NodeGuid=F2EDFF774C0C10654CFCA99F73D8D1EA
CustomProperties Pin (PinId=A14C1DE7476720AC924F52A3DD47C215,PinName="A",PinType.PinCategory="optional",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,PinType.bIsUObjectWrapper=False,LinkedTo=(MaterialGraphNode_9 7E0C44744BDC743042E52F8E4A47700E,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,)
CustomProperties Pin (PinId=08D51D6C4C0F0EE411793CA7D0E504C3,PinName="B",PinType.PinCategory="optional",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,PinType.bIsUObjectWrapper=False,LinkedTo=(MaterialGraphNode_20 DC9506C84CFB44284F7491806CD7CB50,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,)
CustomProperties Pin (PinId=84EF40494C6F89201CBA8D8F229AF644,PinName="Output",PinFriendlyName=NSLOCTEXT("MaterialGraphNode", "Space", " "),Direction="EGPD_Output",PinType.PinCategory="",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,PinType.bIsUObjectWrapper=True,LinkedTo=(MaterialGraphNode_0 71180E3C47A1C9344DA81BA6CCC6392F,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,)
End Object
Begin Object Class=/Script/UnrealEd.MaterialGraphNode Name="MaterialGraphNode_20"
Begin Object Class=/Script/Engine.MaterialExpressionFunctionInput Name="MaterialExpressionFunctionInput_0"
End Object
Begin Object Name="MaterialExpressionFunctionInput_0"
Preview=(Expression=MaterialExpressionScalarParameter'"MaterialGraphNode_3.MaterialExpressionScalarParameter_10"')
InputName="UVUnitSize"
Id=B0DA854442F4305DDC4C7F936E86E1D0
InputType=FunctionInput_Scalar
bUsePreviewValueAsDefault=True
MaterialExpressionEditorX=-1008
MaterialExpressionEditorY=688
MaterialExpressionGuid=560F2CFE4205FB97175BC795DAE49631
Material=Material'"/Engine/Transient.Material_3"'
End Object
MaterialExpression=MaterialExpressionFunctionInput'"MaterialExpressionFunctionInput_0"'
NodePosX=-1008
NodePosY=688
NodeGuid=D544E1534987C0BFA0BA2E9FD2988765
CustomProperties Pin (PinId=368A8C714C01768D5C75998BE7D03FF3,PinName="Preview",PinType.PinCategory="optional",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,PinType.bIsUObjectWrapper=False,LinkedTo=(MaterialGraphNode_3 7E5AD7444187479C2E47AB9FDC179CAA,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,)
CustomProperties Pin (PinId=DC9506C84CFB44284F7491806CD7CB50,PinName="Output",PinFriendlyName=NSLOCTEXT("MaterialGraphNode", "Space", " "),Direction="EGPD_Output",PinType.PinCategory="",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,PinType.bIsUObjectWrapper=True,LinkedTo=(MaterialGraphNode_19 08D51D6C4C0F0EE411793CA7D0E504C3,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,)
End Object
Begin Object Class=/Script/UnrealEd.MaterialGraphNode Name="MaterialGraphNode_21"
Begin Object Class=/Script/Engine.MaterialExpressionMultiply Name="MaterialExpressionMultiply_0"
End Object
Begin Object Name="MaterialExpressionMultiply_0"
A=(Expression=MaterialExpressionLinearInterpolate'"MaterialGraphNode_6.MaterialExpressionLinearInterpolate_6"')
ConstB=-1.000000
MaterialExpressionEditorX=-560
MaterialExpressionEditorY=128
MaterialExpressionGuid=089ACCED44AE93A6B3D3A19BCA02A4A0
Material=Material'"/Engine/Transient.Material_3"'
End Object
MaterialExpression=MaterialExpressionMultiply'"MaterialExpressionMultiply_0"'
NodePosX=-560
NodePosY=128
NodeGuid=B236879949F91CE56DF8BF8AB004C963
CustomProperties Pin (PinId=93BE561D40338359AD1640BFBDBFE913,PinName="A",PinType.PinCategory="optional",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,PinType.bIsUObjectWrapper=False,LinkedTo=(MaterialGraphNode_6 9B3774414AF425ED65864095B76843BA,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,)
CustomProperties Pin (PinId=DBEE652B40BA4ADA11873891BB4FE20A,PinName="B",PinType.PinCategory="optional",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,PinType.bIsUObjectWrapper=False,PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,)
CustomProperties Pin (PinId=990397DE4057EEFCAD5AEBA87A35DE8C,PinName="Output",PinFriendlyName=NSLOCTEXT("MaterialGraphNode", "Space", " "),Direction="EGPD_Output",PinType.PinCategory="",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,PinType.bIsUObjectWrapper=True,LinkedTo=(MaterialGraphNode_9 ECCA2BA544F8AD380F11BDA2BDCE5FB0,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,)
End Object
Begin Object Class=/Script/UnrealEd.MaterialGraphNode Name="MaterialGraphNode_69"
Begin Object Class=/Script/Engine.MaterialExpressionRound Name="MaterialExpressionRound_0"
End Object
Begin Object Name="MaterialExpressionRound_0"
Input=(Expression=MaterialExpressionAbs'"MaterialGraphNode_24.MaterialExpressionAbs_0"')
MaterialExpressionEditorX=-1008
MaterialExpressionEditorY=496
MaterialExpressionGuid=00BF7D3C48DFCEA92D97D9BDFA5AED84
Material=Material'"/Engine/Transient.Material_3"'
End Object
MaterialExpression=MaterialExpressionRound'"MaterialExpressionRound_0"'
NodePosX=-1008
NodePosY=496
NodeGuid=E312124D416074EF7CE465A23C99CF97
CustomProperties Pin (PinId=F2E2EB1F45156E4F53712FA4DADBB58D,PinName="Input",PinFriendlyName=NSLOCTEXT("MaterialGraphNode", "Space", " "),PinType.PinCategory="required",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,PinType.bIsUObjectWrapper=False,LinkedTo=(MaterialGraphNode_24 1075313C4250D267F940A998997BBA7C,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,)
CustomProperties Pin (PinId=80EDBE194FD74D835C29679879AE0C03,PinName="Output",PinFriendlyName=NSLOCTEXT("MaterialGraphNode", "Space", " "),Direction="EGPD_Output",PinType.PinCategory="",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,PinType.bIsUObjectWrapper=True,LinkedTo=(MaterialGraphNode_9 394764F44F934020DD2757BFC8C248F3,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,)
End Object
Begin Object Class=/Script/UnrealEd.MaterialGraphNode Name="MaterialGraphNode_24"
Begin Object Class=/Script/Engine.MaterialExpressionAbs Name="MaterialExpressionAbs_0"
End Object
Begin Object Name="MaterialExpressionAbs_0"
Input=(Expression=MaterialExpressionComponentMask'"MaterialGraphNode_11.MaterialExpressionComponentMask_22"')
MaterialExpressionEditorX=-1104
MaterialExpressionEditorY=496
MaterialExpressionGuid=9964AD10444E96CA631F0799E174842E
Material=Material'"/Engine/Transient.Material_3"'
End Object
MaterialExpression=MaterialExpressionAbs'"MaterialExpressionAbs_0"'
NodePosX=-1104
NodePosY=496
NodeGuid=6810B5B147BC18EB560A13A5AE14E602
CustomProperties Pin (PinId=761EBD734A304BDD76A8CCB18136135B,PinName="Input",PinFriendlyName=NSLOCTEXT("MaterialGraphNode", "Space", " "),PinType.PinCategory="required",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,PinType.bIsUObjectWrapper=False,LinkedTo=(MaterialGraphNode_11 F9771D5441F17B6ECD6F0C8537035621,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,)
CustomProperties Pin (PinId=1075313C4250D267F940A998997BBA7C,PinName="Output",PinFriendlyName=NSLOCTEXT("MaterialGraphNode", "Space", " "),Direction="EGPD_Output",PinType.PinCategory="",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,PinType.bIsUObjectWrapper=True,LinkedTo=(MaterialGraphNode_69 F2E2EB1F45156E4F53712FA4DADBB58D,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,)
End Object
Begin Object Class=/Script/UnrealEd.MaterialGraphNode Name="MaterialGraphNode_23"
Begin Object Class=/Script/Engine.MaterialExpressionRound Name="MaterialExpressionRound_1"
End Object
Begin Object Name="MaterialExpressionRound_1"
Input=(Expression=MaterialExpressionAbs'"MaterialGraphNode_8.MaterialExpressionAbs_6"')
MaterialExpressionEditorX=-1008
MaterialExpressionEditorY=320
MaterialExpressionGuid=00BF7D3C48DFCEA92D97D9BDFA5AED84
Material=Material'"/Engine/Transient.Material_3"'
Function=MaterialFunction'"/Engine/Transient.MaterialFunction_0"'
End Object
MaterialExpression=MaterialExpressionRound'"MaterialExpressionRound_1"'
NodePosX=-1008
NodePosY=320
NodeGuid=8C18DDA84681B09D312584A6374E9F04
CustomProperties Pin (PinId=F2E2EB1F45156E4F53712FA4DADBB58D,PinName="Input",PinFriendlyName=NSLOCTEXT("MaterialGraphNode", "Space", " "),PinType.PinCategory="required",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,PinType.bIsUObjectWrapper=False,LinkedTo=(MaterialGraphNode_8 8752973345C19D04559A49BB0C9F68B2,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,)
CustomProperties Pin (PinId=80EDBE194FD74D835C29679879AE0C03,PinName="Output",PinFriendlyName=NSLOCTEXT("MaterialGraphNode", "Space", " "),Direction="EGPD_Output",PinType.PinCategory="",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,PinType.bIsUObjectWrapper=True,LinkedTo=(MaterialGraphNode_6 211D671A4D45F41633400CA541636EFB,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,)
End Object
Begin Object Class=/Script/UnrealEd.MaterialGraphNode Name="MaterialGraphNode_70"
Begin Object Class=/Script/Engine.MaterialExpressionPixelNormalWS Name="MaterialExpressionPixelNormalWS_1"
End Object
Begin Object Name="MaterialExpressionPixelNormalWS_1"
MaterialExpressionEditorX=-1456
MaterialExpressionEditorY=384
MaterialExpressionGuid=A9BD2506475914F0E3813CA724EC7038
Material=Material'"/Engine/Transient.Material_3"'
End Object
MaterialExpression=MaterialExpressionPixelNormalWS'"MaterialExpressionPixelNormalWS_1"'
NodePosX=-1456
NodePosY=384
NodeGuid=F94F209D43A79EFA1AD5599EABABF84A
CustomProperties Pin (PinId=51D815E64A6B9415A476D9B1E1A756FC,PinName="Output",PinFriendlyName=NSLOCTEXT("MaterialGraphNode", "Space", " "),Direction="EGPD_Output",PinType.PinCategory="",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,PinType.bIsUObjectWrapper=True,LinkedTo=(MaterialGraphNode_5 96BFFAA24FFDE516C4BE75B56D5FF69A,MaterialGraphNode_11 5D2C2C4A4E636E73F303EC9CB146F856,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,)
End Object

Arkiras · December 14, 2020, 6:19pm

Also I would encourage you to report this as a bug

bostonDownamics · December 14, 2020, 7:08pm

Your method works!
I’m going to try and open a ticket for this bug.