Blackmagic Forum

Hi guys!

I noticed that sometimes when I use the "Vector Motion Blur" with a Motion Vector AOV some artifacts appears. Always as a line in the bottom part of the frame. Here you can see the beauty and motion vector AOV:



F16 line artifact with Vector Motion Blur:



With Scale value in 10:



And this not happen in F9:



F9 VMB Scale value in 10:



Hope you can fix this issue, Let me know if you need something more, this happened with different render sequences and projects.

Thanks!

Does it still happen if you set Use GPU to Disable?

I cannot reproduce this artifact. Windows 10, core i7-8700k, GeForce GTX 1070

Hi Bryan!

If I disable the GPU it works, so now I suppose that is a GPU issue in VMB F16 because if I create a new comp with all nodes from scratch still getting the issue:



Here you can download the frame in case that anybody want to make a test.

Comp:

Code: Select all

{
   Tools = ordered() {
      Beauty = Loader {
         Clips = {
            Clip {
               ID = "Clip1",
               Filename = "Y:\\My Drive\\Dyne - Works\\Canda Dry - FAXXI '19\\07_Render\\01_Render_3D\\02_Animation\\CD_Coolf_Anim_Scn_020-v03\\CD_Coolf_Anim_Scn_020-v03_mp_0000.exr",
               FormatID = "OpenEXRFormat",
               Length = 91,
               LengthSetManually = true,
               TrimIn = 0,
               TrimOut = 90,
               ExtendFirst = 0,
               ExtendLast = 0,
               Loop = 0,
               AspectMode = 0,
               Depth = 0,
               TimeCode = 0,
               GlobalStart = 0,
               GlobalEnd = 90
            }
         },
         NameSet = true,
         Inputs = {
            ["Gamut.SLogVersion"] = Input { Value = FuID { "SLog2" }, },
            ["Clip1.OpenEXRFormat.Channels"] = Input { Value = 1, },
            ["Clip1.OpenEXRFormat.RedName"] = Input { Value = FuID { "R" }, },
            ["Clip1.OpenEXRFormat.GreenName"] = Input { Value = FuID { "G" }, },
            ["Clip1.OpenEXRFormat.BlueName"] = Input { Value = FuID { "B" }, },
         },
         ViewInfo = OperatorInfo { Pos = { 462, 34.0303 } },
      },
      CopyMotionVectors = ChannelBoolean {
         Inputs = {
            ToRed = Input { Value = 4, },
            ToGreen = Input { Value = 4, },
            ToBlue = Input { Value = 4, },
            ToAlpha = Input { Value = 4, },
            EnableExtraChannels = Input { Value = 1, },
            ToXVector = Input { Value = 0, },
            ToYVector = Input { Value = 1, },
            Background = Input {
               SourceOp = "Beauty",
               Source = "Output",
            },
            Foreground = Input {
               SourceOp = "MotionVector",
               Source = "Output",
            },
         },
         ViewInfo = OperatorInfo { Pos = { 617.333, 34.0303 } },
      },
      VectorMotionBlur1 = VectorMotionBlur {
         CtrlWZoom = false,
         Inputs = {
            UseGPU = Input { Value = 0, },
            Input = Input {
               SourceOp = "CopyMotionVectors",
               Source = "Output",
            },
         },
         ViewInfo = OperatorInfo { Pos = { 736.222, 34.0303 } },
      },
      MotionVector = Loader {
         Clips = {
            Clip {
               ID = "Clip1",
               Filename = "Y:\\My Drive\\Dyne - Works\\Canda Dry - FAXXI '19\\07_Render\\01_Render_3D\\02_Animation\\CD_Coolf_Anim_Scn_020-v03\\CD_Coolf_Anim_Scn_020-v03_mp_0000.exr",
               FormatID = "OpenEXRFormat",
               Length = 91,
               LengthSetManually = true,
               TrimIn = 0,
               TrimOut = 90,
               ExtendFirst = 0,
               ExtendLast = 0,
               Loop = 0,
               AspectMode = 0,
               Depth = 0,
               TimeCode = 0,
               GlobalStart = 0,
               GlobalEnd = 90
            }
         },
         NameSet = true,
         Inputs = {
            ["Gamut.SLogVersion"] = Input { Value = FuID { "SLog2" }, },
            ["Clip1.OpenEXRFormat.Channels"] = Input { Value = 1, },
            ["Clip1.OpenEXRFormat.RedName"] = Input { Value = FuID { "Motion Vector.red" }, },
            ["Clip1.OpenEXRFormat.GreenName"] = Input { Value = FuID { "Motion Vector.green" }, },
            ["Clip1.OpenEXRFormat.BlueName"] = Input { Value = FuID { "Motion Vector.blue" }, },
         },
         ViewInfo = OperatorInfo { Pos = { 617.333, 67.6667 } },
      }
   }
}

Thanks!

--

Windows 10 / Intel i7 7.700-K / x2 RTX 2080ti / Drivers 441.28

Here is the same issue but in other project:



With GPU disabled in VMB:

Looks like you haven't yet crossed the moderation threshold to be able to add a link.

However, if disabling GPU rendering fixes it, then I doubt I'll be able to reproduce the issue on a different card, anyway. You could try changing your video driver. Fusion has, in the past, had issues with some driver versions.

Anybody else out there with a 2080ti who could look into this one?

Here is the link again (hopefully now it will appear correctly):

https://drive.google.com/file/d/1T39qgd ... sp=sharing

It happen the same with driver 430.86. Also this post works as a bug notification? or I need to post the problem in other site of the forum too to wait for a fix?

Thanks again Bryan,

Ah, I do get the same results. And adjusting my test shows that I can make it happen with synthetic vectors, too:

Code: Select all

{
   Tools = ordered() {
      FastNoise1 = FastNoise {
         CtrlWZoom = false,
         Inputs = {
            Width = Input { Value = 1920, },
            Height = Input { Value = 1080, },
            ["Gamut.SLogVersion"] = Input { Value = FuID { "SLog2" }, },
            XScale = Input { Value = 20, },
            Seethe = Input { Value = 0.696, },
            Color1Alpha = Input { Value = 1, },
         },
         ViewInfo = OperatorInfo { Pos = { 660.667, -65.697 } },
      },
      FastNoise1_1 = FastNoise {
         Inputs = {
            Width = Input { Value = 1920, },
            Height = Input { Value = 1080, },
            ["Gamut.SLogVersion"] = Input { Value = FuID { "SLog2" }, },
            XScale = Input { Value = 30, },
            Seethe = Input { Value = 2.167, },
            Color1Red = Input { Value = 1, },
            Color1Alpha = Input { Value = 1, },
            Color2Red = Input { Value = 0, },
            Color2Blue = Input { Value = 0, },
         },
         ViewInfo = OperatorInfo { Pos = { 745.333, -102.939 } },
      },
      VectorMotionBlur1 = VectorMotionBlur {
         Inputs = {
            Input = Input {
               SourceOp = "FastNoise1",
               Source = "Output",
            },
            Vectors = Input {
               SourceOp = "FastNoise1_1",
               Source = "Output",
            },
            XVectorChannel = Input { Value = 0, },
            YChannel = Input { Value = 1, },
         },
         ViewInfo = OperatorInfo { Pos = { 738.667, -23.5455 } },
      }
   }
}


Technically, posting here counts as a bug report, but it's probably a good idea to put one in over at We Suck Less as well, since that forum's bug tracker is better organized:
https://www.steakunderwater.com/wesuckl ... m.php?f=19

Ready, I posted the bug report and I added your example:

https://www.steakunderwater.com/wesuckless/viewtopic.php?f=19&t=3585

Hopefully the dev team can fix it. Thanks for your help like always!

Bumping this again because this bug is now three major versions old (if we count Fusion in R15)

Bump up !!! This problem is still present in Davinci Resolve 17.4.1 BUILD 4.
Also please add elliptical (curved) blur version to Vector Motion Blur.

David Chabashvili wrote:Bump up !!! This problem is still present in Davinci Resolve 17.4.1 BUILD 4.
Also please add elliptical (curved) blur version to Vector Motion Blur.

Just discovered this issue and this thread.. seems like it's been going on for some time.

Hi!

This issue still in Fusion 18.0.1

Carlos Dordelly wrote:Hi!

This issue still in Fusion 18.0.1

That probably means it has now been promoted to be a "feature"

Seems to be fixed in 18.0.2
Thank you, Blackmagic! I no longer have to use Expressions that toggle between GPU mode while interactive working and CPU when rendering.