Using mask texture creates artefacts between mask values

Development World Creation
1

I am trying to make a simple scrolling texture where the scrolling speed of the parts of the texture is controlled be a mask.

Here is the mask:
msk

The mask has sharp transitions and now I have run into problem where there are weird line artefacts between mask values. Like so:

artefacts
artefacts202×226 23.4 KB

Here is an example node setup:

setup
setup1016×451 88.7 KB

I am suspecting that this is due to the texture compression but after playing around with different settings I haven’t found anything that would resolve this problem. Changing bitrate and format of the source texture also didn’t help.
Does anyone have some idea on how to make the values be exact without lines in between?

2

Hello Cooba, Welcome to the Forums.

Cool material, I re-constructed it and changed the texture group to ‘2D Pixels (Unfiltered)’ but I still see the lines.

Experimented with a few more texture settings, but not sure how else to troubleshoot.

One path forward might be to create those bands through shader logic instead of relying on a texture. (Although not sure how to do that from the ground-up, there are some ‘Generate Band’ nodes in UE though!)

Pastable material nodes if anyone else wants to experiment:

Copy paste this into material graph

Begin Object Class=/Script/UnrealEd.MaterialGraphNode Name=“MaterialGraphNode_0” ExportPath=“/Script/UnrealEd.MaterialGraphNode’/Engine/Transient.MaskMat:MaterialGraph_0.MaterialGraphNode_0’”
Begin Object Class=/Script/Engine.MaterialExpressionTextureSample Name=“MaterialExpressionTextureSample_0” ExportPath=“/Script/Engine.MaterialExpressionTextureSample’/Engine/Transient.MaskMat:MaterialGraph_0.MaterialGraphNode_0.MaterialExpressionTextureSample_0’”
End Object
Begin Object Name=“MaterialExpressionTextureSample_0” ExportPath=“/Script/Engine.MaterialExpressionTextureSample’/Engine/Transient.MaskMat:MaterialGraph_0.MaterialGraphNode_0.MaterialExpressionTextureSample_0’”
Texture=“/Script/Engine.Texture2D’/Game/Materials/msk.msk’”
MaterialExpressionEditorX=-1360
MaterialExpressionEditorY=368
MaterialExpressionGuid=C3A7F05A47D57B6AD26BE1B6C73A6884
Material=“/Script/UnrealEd.PreviewMaterial’/Engine/Transient.MaskMat’”
End Object
MaterialExpression=“/Script/Engine.MaterialExpressionTextureSample’MaterialExpressionTextureSample_0’”
NodePosX=-1360
NodePosY=368
AdvancedPinDisplay=Hidden
ErrorType=1
ErrorMsg=“Sampler type is Color, should be Linear Color for /Game/Materials/msk.msk”
NodeGuid=31C5FB704F1E1ED3842D74A86B281F29
CustomProperties Pin (PinId=063DFDF44374E9ED386603867AC51BB8,PinName=“UVs”,PinType.PinCategory=“optional”,PinType.PinSubCategory=“byte”,PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,PinType.bIsUObjectWrapper=False,PinType.bSerializeAsSinglePrecisionFloat=False,DefaultValue=“0”,PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,)
CustomProperties Pin (PinId=DB004E4647DA051AA7454EB3F99358F4,PinName=“Tex”,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,PinType.bSerializeAsSinglePrecisionFloat=False,PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,)
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CustomProperties Pin (PinId=5D87702D4B914408BF3DE78CC13D70AD,PinName=“A”,Direction=“EGPD_Output”,PinType.PinCategory=“mask”,PinType.PinSubCategory=“alpha”,PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,PinType.bIsUObjectWrapper=False,PinType.bSerializeAsSinglePrecisionFloat=False,PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,)
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End Object
Begin Object Class=/Script/UnrealEd.MaterialGraphNode Name=“MaterialGraphNode_1” ExportPath=“/Script/UnrealEd.MaterialGraphNode’/Engine/Transient.MaskMat:MaterialGraph_0.MaterialGraphNode_1’”
Begin Object Class=/Script/Engine.MaterialExpressionMultiply Name=“MaterialExpressionMultiply_0” ExportPath=“/Script/Engine.MaterialExpressionMultiply’/Engine/Transient.MaskMat:MaterialGraph_0.MaterialGraphNode_1.MaterialExpressionMultiply_0’”
End Object
Begin Object Name=“MaterialExpressionMultiply_0” ExportPath=“/Script/Engine.MaterialExpressionMultiply’/Engine/Transient.MaskMat:MaterialGraph_0.MaterialGraphNode_1.MaterialExpressionMultiply_0’”
A=(Expression=“/Script/Engine.MaterialExpressionTextureSample’MaterialGraphNode_0.MaterialExpressionTextureSample_0’”,OutputIndex=1,Mask=1,MaskR=1)
ConstB=0.200000
MaterialExpressionEditorX=-1056
MaterialExpressionEditorY=608
MaterialExpressionGuid=77ECB47E40B1E9F72420A69525D6225A
Material=“/Script/UnrealEd.PreviewMaterial’/Engine/Transient.MaskMat’”
bCollapsed=False
End Object
MaterialExpression=“/Script/Engine.MaterialExpressionMultiply’MaterialExpressionMultiply_0’”
NodePosX=-1056
NodePosY=608
NodeGuid=7CAF9B02474616443C985FB0C9D0605F
CustomProperties Pin (PinId=BF8CCDD74EA3E75FB96E85AE6BECE704,PinName=“A”,PinType.PinCategory=“optional”,PinType.PinSubCategory=“red”,PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,PinType.bIsUObjectWrapper=False,PinType.bSerializeAsSinglePrecisionFloat=False,DefaultValue=“0.0”,LinkedTo=(MaterialGraphNode_0 AFB94BB64449DCAED1EEDA93EFD00F01,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,)
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End Object
Begin Object Class=/Script/UnrealEd.MaterialGraphNode Name=“MaterialGraphNode_2” ExportPath=”/Script/UnrealEd.MaterialGraphNode’/Engine/Transient.MaskMat:MaterialGraph_0.MaterialGraphNode_2’"
Begin Object Class=/Script/Engine.MaterialExpressionMultiply Name=“MaterialExpressionMultiply_1” ExportPath=“/Script/Engine.MaterialExpressionMultiply’/Engine/Transient.MaskMat:MaterialGraph_0.MaterialGraphNode_2.MaterialExpressionMultiply_1’”
End Object
Begin Object Name=“MaterialExpressionMultiply_1” ExportPath=“/Script/Engine.MaterialExpressionMultiply’/Engine/Transient.MaskMat:MaterialGraph_0.MaterialGraphNode_2.MaterialExpressionMultiply_1’”
A=(Expression=“/Script/Engine.MaterialExpressionTime’MaterialGraphNode_4.MaterialExpressionTime_0’”)
B=(Expression=“/Script/Engine.MaterialExpressionMultiply’MaterialGraphNode_1.MaterialExpressionMultiply_0’”)
MaterialExpressionEditorX=-759
MaterialExpressionEditorY=418
MaterialExpressionGuid=EE458E33445B02FFA3AE4FB798C6F4AF
Material=“/Script/UnrealEd.PreviewMaterial’/Engine/Transient.MaskMat’”
bCollapsed=False
End Object
MaterialExpression=“/Script/Engine.MaterialExpressionMultiply’MaterialExpressionMultiply_1’”
NodePosX=-759
NodePosY=418
NodeGuid=F6C55B7843B08BFF48ED0FAC03D229F6
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End Object
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MaterialExpressionGuid=403D00AB40E95A736A66109699AFA948
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MaterialExpression=“/Script/Engine.MaterialExpressionAdd’MaterialExpressionAdd_0’”
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ErrorType=1
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NodeGuid=69C7507E4498C35D198C4C84E4DA4DA2
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End Object

3

Mips.
Disable mips.

Also you got to clamp.
Your result is our of range after you multiply and add time. Keep it relevant to the texture space if you use it as a texture. 0 to 1 values per channel.