8000 LinearGradient discontinuity · Issue #475 · tixl3d/tixl · GitHub
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LinearGradient discontinuity #475

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grant-h opened this issue Oct 8, 2024 · 3 comments
Open

LinearGradient discontinuity #475

grant-h opened this issue Oct 8, 2024 · 3 comments

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@grant-h
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grant-h commented Oct 8, 2024 •
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Describe the bug
I am experiencing a discontinuity (that little black line) for LinearGradient. This manifests as flickering while changing the offset parameter to make it animated. Running on 3.9.3 under Wine so not sure if this is just for me.

Please complete the following information):

  • OS: Ubuntu 22.04 (Wine/Bottles)
  • Version: 3.9.3
  • Graphics card and resolution: NVIDIA 1060

Screenshot from 2024-10-08 11-24-11

Patch

[{"Name":"Object","Id":"bf183f61-6536-4290-b7bd-ace26f0de2eb","Inputs":[],"Children":[{"Id":"609c6fe2-9706-48c0-82db-93debc626451"/*LinearGradient*/,"SymbolId":"2c3d2c26-ac45-42e9-8f13-6ea338333568","InputValues":[{"Id":"e47e9e63-9c94-4c29-9555-2452fa498d57"/*Gradient*/,"Type":"T3.Core.DataTypes.Gradient","Value":{"Gradient":{"Interpolation":"Smooth","Steps":[{"Id":"21d24dcd-f1c2-4596-bdc8-72800b9a7299","NormalizedPosition":0.0,"Color":{"R":0.0,"G":1.2159347E-11,"B":1E-06,"A":1.0}},{"Id":"fd66af7f-e9f4-4989-8a56-23dfb8f4a042","NormalizedPosition":1.0,"Color":{"R":1.0,"G":0.99999,"B":1.0,"A":1.0}}]}}},{"Id":"10d59d0f-a5a3-42e6-b874-345ab028978e"/*Width*/,"Type":"System.Single","Value":0.56},{"Id":"e4739314-4075-4d14-a80d-79e149081dac"/*SizeMode*/,"Type":"System.Int32","Value":1},{"Id":"5774969c-ef4d-482e-ab37-b3a84b09debb"/*PingPong*/,"Type":"System.Boolean","Value":true},{"Id":"7f3fe86d-f259-458a-908a-0a71d39ca678"/*Repeat*/,"Type":"System.Boolean","Value":true},{"Id":"abf3456d-35bc-49ec-9aa6-c5571fbb209a"/*Center*/,"Type":"System.Numerics.Vector2","Value":{"X":1.22,"Y":0.04}},{"Id":"c38647f6-c6ea-40a0-b872-0df6d4168c05"/*Offset*/,"Type":"System.Single","Value":0.93},{"Id":"29587763-5456-4d33-bfd4-5d47b133f1cd"/*OffsetMode*/,"Type":"System.Int32","Value":0},{"Id":"53afc8d9-f417-4628-9a97-220bec62919f"/*Resolution*/,"Type":"T3.Core.DataTypes.Vector.Int2","Value":{"X":850,"Y":480}}],"Outputs":[]}],"Connections":[]},{"Id":"bf183f61-6536-4290-b7bd-ace26f0de2eb"/*Object*/,"InputUis":[],"SymbolChildUis":[{"ChildId":"609c6fe2-9706-48c0-82db-93debc626451"/*LinearGradient*/,"Position":{"X":0.0,"Y":0.0}}],"OutputUis":[]}]
@ylmrx
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ylmrx commented Oct 18, 2024

This happens on every systems. (not specific to wine execution)

it's due to rounding errors and float resolution when there's overlaps (ie. repeating gradients)

you can work-around it tweaking Center.y (resp. Center.x, if you have a vertical gradient) until it's out of the image.

I tried tweaking the shader in order to avoid those glitches (or drastically reducing them), to no avail.

@grant-h
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grant-h commented Oct 25, 2024

The glitches seem to flicker as the texture is scrolled in a way that seems out of range for typical data. It almost seems like some values are not initialized on the first frame or with certain floating point offsets. In short, this feels like a bug to me

@pixtur
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pixtur commented Dec 16, 2024

Thanks for reporting this glitch (and sorry for the long response time. I somehow overlooked the issue).
I already experiences the same glitch and looked into it. It's finicky... I will try again.

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