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Spiral Blur in Post Process Not Working in 4.12?

I can't get Spiral Blur to work at all. Following the instructions on the wiki and in the release notes seems to just end up giving me a white screen.

Here's my material graph: alt text

 Begin Object Class=MaterialGraphNode Name="MaterialGraphNode_55"
    Begin Object Class=EdGraphPin Name="EdGraphPin_6229"
    End Object
    Begin Object Class=EdGraphPin Name="EdGraphPin_6228"
    End Object
    Begin Object Class=EdGraphPin Name="EdGraphPin_6227"
    End Object
    Begin Object Class=EdGraphPin Name="EdGraphPin_6226"
    End Object
    Begin Object Class=EdGraphPin Name="EdGraphPin_6225"
    End Object
    Begin Object Class=EdGraphPin Name="EdGraphPin_6224"
    End Object
    Begin Object Class=EdGraphPin Name="EdGraphPin_6223"
    End Object
    Begin Object Class=EdGraphPin Name="EdGraphPin_6222"
    End Object
    Begin Object Class=EdGraphPin Name="EdGraphPin_6221"
    End Object
    Begin Object Class=MaterialExpressionMaterialFunctionCall Name="MaterialExpressionMaterialFunctionCall_3"
    End Object
    Begin Object Name="EdGraphPin_6229"
       PinName="SceneColor clamp to 0"
       Direction=EGPD_Output
    End Object
    Begin Object Name="EdGraphPin_6228"
       PinName="Result"
       Direction=EGPD_Output
       LinkedTo(0)=EdGraphPin'MaterialGraphNode_Root_1.EdGraphPin_6199'
    End Object
    Begin Object Name="EdGraphPin_6227"
       PinName="Distance Mask (S)"
       PinType=(PinCategory="optional")
       LinkedTo(0)=EdGraphPin'MaterialGraphNode_60.EdGraphPin_6234'
    End Object
    Begin Object Name="EdGraphPin_6226"
       PinName="TempAA Distance Blur (S)"
       PinType=(PinCategory="optional")
    End Object
    Begin Object Name="EdGraphPin_6225"
       PinName="TempAA Radial Blur (S)"
       PinType=(PinCategory="optional")
       LinkedTo(0)=EdGraphPin'MaterialGraphNode_59.EdGraphPin_6233'
    End Object
    Begin Object Name="EdGraphPin_6224"
       PinName="Radial Offset (S)"
       PinType=(PinCategory="optional")
       LinkedTo(0)=EdGraphPin'MaterialGraphNode_58.EdGraphPin_6232'
    End Object
    Begin Object Name="EdGraphPin_6223"
       PinName="Radial Steps (S)"
       PinType=(PinCategory="optional")
       LinkedTo(0)=EdGraphPin'MaterialGraphNode_57.EdGraphPin_6231'
    End Object
    Begin Object Name="EdGraphPin_6222"
       PinName="Distance Steps (S)"
       PinType=(PinCategory="optional")
       LinkedTo(0)=EdGraphPin'MaterialGraphNode_57.EdGraphPin_6231'
    End Object
    Begin Object Name="EdGraphPin_6221"
       PinName="Distance (S)"
       PinType=(PinCategory="optional")
       LinkedTo(0)=EdGraphPin'MaterialGraphNode_56.EdGraphPin_6230'
    End Object
    Begin Object Name="MaterialExpressionMaterialFunctionCall_3"
       MaterialFunction=MaterialFunction'/Engine/Functions/Engine_MaterialFunctions01/Texturing/SpiralBlur-SceneTexture.SpiralBlur-SceneTexture'
       FunctionInputs(0)=(ExpressionInputId=7CC6063741354B194A27C5BFBF5AEFC6,Input=(Expression=MaterialExpressionConstant'MaterialGraphNode_56.MaterialExpressionConstant_13',InputName="Distance"))
       FunctionInputs(1)=(ExpressionInputId=999268474CE8F923FC5CA297555C451B,Input=(Expression=MaterialExpressionConstant'MaterialGraphNode_57.MaterialExpressionConstant_14',InputName="Distance Steps"))
       FunctionInputs(2)=(ExpressionInputId=2D450737453F92D15333EDA2A8A9C9FB,Input=(Expression=MaterialExpressionConstant'MaterialGraphNode_57.MaterialExpressionConstant_14',InputName="Radial Steps"))
       FunctionInputs(3)=(ExpressionInputId=E0C339BD412802ACF8D1CFA66E382F99,Input=(Expression=MaterialExpressionConstant'MaterialGraphNode_58.MaterialExpressionConstant_15',InputName="Radial Offset"))
       FunctionInputs(4)=(ExpressionInputId=748401E04D67576D20CF0D84378BBBB2,Input=(Expression=MaterialExpressionConstant'MaterialGraphNode_59.MaterialExpressionConstant_16',InputName="TempAA Radial Blur"))
       FunctionInputs(5)=(ExpressionInputId=0D1F10574FA92039F60F69A2D8E6E6A7,Input=(OutputIndex=-1,InputName="TempAA Distance Blur"))
       FunctionInputs(6)=(ExpressionInputId=2B07D31B49FF9616FAECE38AD587118B,Input=(Expression=MaterialExpressionConstant'MaterialGraphNode_60.MaterialExpressionConstant_17',InputName="Distance Mask"))
       FunctionOutputs(0)=(ExpressionOutputId=F121DEB046D973F044644E80BD424FF0,Output=(OutputName="Result"))
       FunctionOutputs(1)=(ExpressionOutputId=A1CD670D4016FA118BA6669E743CD957,Output=(OutputName="SceneColor clamp to 0"))
       MaterialExpressionEditorX=-576
       MaterialExpressionEditorY=-160
       MaterialExpressionGuid=66549F0247D0B96185C4E4AE851BDB8F
       Material=PreviewMaterial'/Engine/Transient.PreviewMaterial_1'
       Outputs(0)=(OutputName="Result")
       Outputs(1)=(OutputName="SceneColor clamp to 0")
    End Object
    MaterialExpression=MaterialExpressionMaterialFunctionCall'MaterialExpressionMaterialFunctionCall_3'
    Pins(0)=EdGraphPin'EdGraphPin_6221'
    Pins(1)=EdGraphPin'EdGraphPin_6222'
    Pins(2)=EdGraphPin'EdGraphPin_6223'
    Pins(3)=EdGraphPin'EdGraphPin_6224'
    Pins(4)=EdGraphPin'EdGraphPin_6225'
    Pins(5)=EdGraphPin'EdGraphPin_6226'
    Pins(6)=EdGraphPin'EdGraphPin_6227'
    Pins(7)=EdGraphPin'EdGraphPin_6228'
    Pins(8)=EdGraphPin'EdGraphPin_6229'
    NodePosX=-576
    NodePosY=-160
    NodeGuid=CEE1EB7B48CB1EDDD9C7C9B0587723DF
 End Object
 Begin Object Class=MaterialGraphNode Name="MaterialGraphNode_56"
    Begin Object Class=EdGraphPin Name="EdGraphPin_6230"
    End Object
    Begin Object Class=MaterialExpressionConstant Name="MaterialExpressionConstant_13"
    End Object
    Begin Object Name="EdGraphPin_6230"
       PinName="Output"
       PinFriendlyName=" "
       Direction=EGPD_Output
       LinkedTo(0)=EdGraphPin'MaterialGraphNode_55.EdGraphPin_6221'
    End Object
    Begin Object Name="MaterialExpressionConstant_13"
       R=0.010000
       MaterialExpressionEditorX=-742
       MaterialExpressionEditorY=-190
       MaterialExpressionGuid=4D8B16D449CFAE0934F5C2932428BCE8
       Material=PreviewMaterial'/Engine/Transient.PreviewMaterial_1'
    End Object
    MaterialExpression=MaterialExpressionConstant'MaterialExpressionConstant_13'
    Pins(0)=EdGraphPin'EdGraphPin_6230'
    NodePosX=-742
    NodePosY=-190
    NodeGuid=E24B46894B242316E238BE9FBCF76FFC
 End Object
 Begin Object Class=MaterialGraphNode Name="MaterialGraphNode_57"
    Begin Object Class=EdGraphPin Name="EdGraphPin_6231"
    End Object
    Begin Object Class=MaterialExpressionConstant Name="MaterialExpressionConstant_14"
    End Object
    Begin Object Name="EdGraphPin_6231"
       PinName="Output"
       PinFriendlyName=" "
       Direction=EGPD_Output
       LinkedTo(0)=EdGraphPin'MaterialGraphNode_55.EdGraphPin_6222'
       LinkedTo(1)=EdGraphPin'MaterialGraphNode_55.EdGraphPin_6223'
    End Object
    Begin Object Name="MaterialExpressionConstant_14"
       R=16.000000
       MaterialExpressionEditorX=-736
       MaterialExpressionEditorY=-128
       MaterialExpressionGuid=4D8B16D449CFAE0934F5C2932428BCE8
       Material=PreviewMaterial'/Engine/Transient.PreviewMaterial_1'
    End Object
    MaterialExpression=MaterialExpressionConstant'MaterialExpressionConstant_14'
    Pins(0)=EdGraphPin'EdGraphPin_6231'
    NodePosX=-736
    NodePosY=-128
    NodeGuid=5C6E5FE04C938A74A439C79290DF69DE
 End Object
 Begin Object Class=MaterialGraphNode Name="MaterialGraphNode_58"
    Begin Object Class=EdGraphPin Name="EdGraphPin_6232"
    End Object
    Begin Object Class=MaterialExpressionConstant Name="MaterialExpressionConstant_15"
    End Object
    Begin Object Name="EdGraphPin_6232"
       PinName="Output"
       PinFriendlyName=" "
       Direction=EGPD_Output
       LinkedTo(0)=EdGraphPin'MaterialGraphNode_55.EdGraphPin_6224'
    End Object
    Begin Object Name="MaterialExpressionConstant_15"
       R=1.000000
       MaterialExpressionEditorX=-736
       MaterialExpressionEditorY=-48
       MaterialExpressionGuid=4D8B16D449CFAE0934F5C2932428BCE8
       Material=PreviewMaterial'/Engine/Transient.PreviewMaterial_1'
    End Object
    MaterialExpression=MaterialExpressionConstant'MaterialExpressionConstant_15'
    Pins(0)=EdGraphPin'EdGraphPin_6232'
    NodePosX=-736
    NodePosY=-48
    NodeGuid=F2024EEF4A2E96257AD74CBDBF82FBF4
 End Object
 Begin Object Class=MaterialGraphNode Name="MaterialGraphNode_59"
    Begin Object Class=EdGraphPin Name="EdGraphPin_6233"
    End Object
    Begin Object Class=MaterialExpressionConstant Name="MaterialExpressionConstant_16"
    End Object
    Begin Object Name="EdGraphPin_6233"
       PinName="Output"
       PinFriendlyName=" "
       Direction=EGPD_Output
       LinkedTo(0)=EdGraphPin'MaterialGraphNode_55.EdGraphPin_6225'
    End Object
    Begin Object Name="MaterialExpressionConstant_16"
       R=2.000000
       MaterialExpressionEditorX=-736
       MaterialExpressionEditorY=16
       MaterialExpressionGuid=4D8B16D449CFAE0934F5C2932428BCE8
       Material=PreviewMaterial'/Engine/Transient.PreviewMaterial_1'
    End Object
    MaterialExpression=MaterialExpressionConstant'MaterialExpressionConstant_16'
    Pins(0)=EdGraphPin'EdGraphPin_6233'
    NodePosX=-736
    NodePosY=16
    NodeGuid=676FAC21440125C7C47E7CBD4C6554B8
 End Object
 Begin Object Class=MaterialGraphNode Name="MaterialGraphNode_60"
    Begin Object Class=EdGraphPin Name="EdGraphPin_6234"
    End Object
    Begin Object Class=MaterialExpressionConstant Name="MaterialExpressionConstant_17"
    End Object
    Begin Object Name="EdGraphPin_6234"
       PinName="Output"
       PinFriendlyName=" "
       Direction=EGPD_Output
       LinkedTo(0)=EdGraphPin'MaterialGraphNode_55.EdGraphPin_6227'
    End Object
    Begin Object Name="MaterialExpressionConstant_17"
       R=1.000000
       MaterialExpressionEditorX=-704
       MaterialExpressionEditorY=144
       MaterialExpressionGuid=D73BC8314CD57BEBC8B6438CD0466CE5
       Material=PreviewMaterial'/Engine/Transient.PreviewMaterial_1'
    End Object
    MaterialExpression=MaterialExpressionConstant'MaterialExpressionConstant_17'
    Pins(0)=EdGraphPin'EdGraphPin_6234'
    NodePosX=-704
    NodePosY=144
    NodeGuid=11FC00E746B07D03B95D80B7CB85997F
 End Object
 


Product Version: UE 4.12
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asked Aug 18 '16 at 12:57 PM in Rendering

avatar image

Feanix
343 16 18 26

avatar image gustavorios2 Sep 27 '16 at 03:26 PM

this is happening to me too =(

avatar image samuelthomson Mar 04 '17 at 03:28 PM

Hi, did anyone find a solution? I'm getting this white-out behaviour too.

I don't know whether its related, but I also can't get DoF to display when I change the settings for that.

avatar image Demnus Jun 20 '17 at 04:52 PM

Same problem here! UE version 4.15.Still got it!

avatar image Gomo Aug 26 '17 at 01:55 AM

Also in 4.17.1 it doesn't work

avatar image LazaLaza Oct 19 '17 at 11:55 AM

alt text

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2 answers: sort voted first

Ok, let me just try to explain how my case manifests and how i managed to "solve the issue".

First, the whiteout issues was not present all the time and in all levels i had. It was also present as a material for the mes and as a post process material .For example in the example map i was never able to reproduce it. It seemed to be dependent on camera position and direction, but with no logic connecting it to something like small bounds or something like that. I observed that if you put several objects in screen space with the same shader the whiteout happens instantly on all three in certain angles. So, that led me to start  digging a bit through the custom node that creates the blur. So, me being an artist it took me some time to understand what the code is doing and i found one very strange thing that caught my eye. In the custom expression node after all the variable statements and some fiddly code stuff i don't understand there starts an If statement that basically does the blur effect and it goes like this :

int i=0; if (DistanceSteps<1) { return DecodeSceneColorForMaterialNode(NewUV); } else { //CurDistance += 0.5*StepSize; while ( i < (int) DistanceSteps) {

//CurDistance+=StepSize;......  etc. 

ok, so the first part tells me that if my distance step setting in my material are less than one the shader will return  some function "DecodeSceneColorForMaterialNode(NewUV)" , to test this i put my step size to 0.7 or some value lest than one to see if this function returns me just the scene color with no blur as it is suppose to do, and of course it does but the witheout stuff was still present i the image which led me to believe that there was something wrong with this function. To bypass this i substituted this function with a vector 3 input i made and called it "SceneColor" , next i plugged in a scene color with a mask (r,g,b) in the node and looked at the result, and it worked! Yay!!!  ook so i started moving forward and just for the sake of testing i pumped the distance steps to 16 to what will happen, The code says that it should behave exactly like before since that part of the code was not altered, but to my surprise and to the surprise of my lead programmer that helped a bit with the code the whiteout was not present anymore. Puzzled by this we sad, ok lets put the code back as it was and see what will happen. So we did and the wihteout wasn't there anymore   ...........   oO...... what ?  how is that possible?..... so now even more puzzled than before i start doing supid crazy stuff ... so i took out the scene color and replaced it with a vector 3 .... now the whiteout returned..... whaaat? how is that possible if the input i created on the custom node is not being used anywhere, how can that alter the result......wtf? We havent been able to understand why does it work only if the scene color is hooked even if it is not used but never the less it works for now. I would like for someone that understands this to explain what happened so i don't run into the same problems again....

for you guys that have these issues here is the code from the node just in case i forgot i altered something and an image of the material expression setu..

float3 CurColor; float2 BaseUV = MaterialFloat2(ScreenAlignedPosition(Parameters.ScreenPosition).xy); float2 NewUV = BaseUV; float StepSize = Distance / (int) DistanceSteps; float CurDistance=0; float2 CurOffset; float TwoPi = 6.283185; float Substep; float2 ScenePixels=View.BufferSizeAndInvSize.xy*BaseUV; ScenePixels+=View.TemporalAAParams.r; float2 RandomSamp = ((uint)(ScenePixels.x) + 2 (uint)(ScenePixels.y)) % 5; RandomSamp+=Texture2DSample(Tex,TexSampler,ScenePixels); RandomSamp/=5; RandomSamp-=0.5; TempAARotation=RandomSamp; TempAADistance*=StepSize*RandomSamp;

int i=0; if (DistanceSteps<1) { return DecodeSceneColorForMaterialNode(NewUV); } else { //CurDistance += 0.5*StepSize; while ( i < (int) DistanceSteps) {

//CurDistance+=StepSize; for (int j = 0; j < (int) RadialSteps; j++) { CurOffset.x = cos(TwoPi*((TempAARotation+Substep) / RadialSteps)); CurOffset.y = sin(TwoPi*((TempAARotation+Substep) / RadialSteps)); CurOffset =DistanceMask; NewUV.x = BaseUV.x + (CurOffset.x (CurDistance+(RandomSamp*TempAADistance))); NewUV.y = BaseUV.y + (CurOffset.y (CurDistance+(RandomSamp*TempAADistance))); CurColor += DecodeSceneColorForMaterialNode(NewUV); //CurDistance+=(StepSize+(TempAADistance))/RadialSteps; Substep++; } CurDistance+=StepSize; Substep+=RadialOffset; i++; } CurColor = CurColor / ((int)DistanceSteps(int)RadialSteps); return CurColor; }alt text

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answered Oct 19 '17 at 11:55 AM

avatar image

LazaLaza
1 1

avatar image AaronVFX Nov 24 '17 at 01:08 PM

I've just set this up and I still get a whiteout? I've double checked everything so it's exactly how you laid it out in the custom node, but it still whites out. Not quite sure whats going on there

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The second output must be hooked to Opacity, else you will just get bright white.

alt text

spiralwhite.png (38.8 kB)
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answered Jul 06 '18 at 12:33 AM

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Spoondog
430 12 21 36

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