Script-generated compositor node groups don't update #63050

New Issue

Vaclav Benc · 2019-03-28T15:08:47+01:00

Vaclav Benc commented

2019-03-28 15:08:47 +01:00

System Information
Operating system: Windows 10
Graphics card: Nvidia GeForce 1080Ti

Blender Version
Broken: 2.79b f4dc9f9d68

Short description of error

After running a script to generate compositor node groups, the node groups seem to break.

Exact steps for others to reproduce the error

1. open attached .blend file
1. run the script in the .blend file (generate-compositor-nodes.py) to generate the compositor nodes
1. render with Ctrl+F12
1. Output_0001.png and Processing-Output_0001.png are different

NOTE: If I save the .blend file, close it and open it again, and then render, then Processing-Output_0001.png is correct (the same as Output_0001.png).

Attached blend file:
blender-nodes-test.blend

**System Information** Operating system: Windows 10 Graphics card: Nvidia GeForce 1080Ti **Blender Version** Broken: 2.79b f4dc9f9d68b **Short description of error** After running a script to generate compositor node groups, the node groups seem to break. **Exact steps for others to reproduce the error** - 1. open attached .blend file - 2. run the script in the .blend file (generate-compositor-nodes.py) to generate the compositor nodes - 3. render with Ctrl+F12 - 4. Output_0001.png and Processing-Output_0001.png are different NOTE: If I save the .blend file, close it and open it again, and then render, then Processing-Output_0001.png is correct (the same as Output_0001.png). Attached blend file: [blender-nodes-test.blend](https://archive.blender.org/developer/F6895245/blender-nodes-test.blend)

Vaclav Benc commented

2019-03-28 15:08:47 +01:00

Added subscriber: @VaclavBenc

Sebastian Parborg commented

2019-03-28 18:23:44 +01:00

Added subscriber: @ZedDB

Jeroen Bakker was assigned by Sebastian Parborg

2019-03-28 18:23:44 +01:00

Sebastian Parborg commented

2019-03-28 18:23:44 +01:00

I can confirm that this is still an issue in 2.8 (in 2.8 you need to change out render.layers to view_layers though).

I'm also getting an assert when running the script:

ERROR (bke.library): blender/source/blender/blenkernel/intern/library.c:185 id_us_ensure_real: ID user count error: SCScene (from '[Main]')

I can confirm that this is still an issue in 2.8 (in 2.8 you need to change out `render.layers` to `view_layers` though). I'm also getting an assert when running the script: ``` ERROR (bke.library): blender/source/blender/blenkernel/intern/library.c:185 id_us_ensure_real: ID user count error: SCScene (from '[Main]') ```

Jeroen Bakker commented

2019-05-24 11:50:15 +02:00

Checking doesn't seem to be related to the node group. But in the script the socket type is configured to be a value. And it seems that somewhere in the file output node a single value buffer is stored as (a, a, a, a)

Image: ./Processing-Output_0001.png
  Format: PNG (Portable Network Graphics)
  Mime type: image/png
  Class: DirectClass
  Geometry: 117x117+0+0
  Resolution: 28.35x28.35
  Print size: 4.12698x4.12698
  Units: PixelsPerCentimeter
  Type: GrayscaleAlpha
  Endianess: Undefined
  Colorspace: sRGB
  Depth: 8-bit
  Channel depth:
    gray: 8-bit
    alpha: 8-bit
  Channel statistics:
    Pixels: 13689
    Gray:
      min: 0 (0)
      max: 23 (0.0901961)
      mean: 0.970049 (0.00380411)
      standard deviation: 3.75195 (0.0147135)
      kurtosis: 14.5765
      skewness: 3.93552
      entropy: 0.138801
    Alpha:
      min: 0 (0)
      max: 23 (0.0901961)
      mean: 0.970049 (0.00380411)
      standard deviation: 3.75195 (0.0147135)
      kurtosis: 14.5765
      skewness: -3.93552
      entropy: 0.138801
  Alpha: graya(0,0)   #00000000
  Colors: 24
  Histogram:
     12716: (  0,  0,  0,  0) #00000000 graya(0,0)
        19: (  1,  1,  1,  1) #01010101 graya(1,0.00392157)
        20: (  2,  2,  2,  2) #02020202 graya(2,0.00784314)
         7: (  3,  3,  3,  3) #03030303 graya(3,0.0117647)
        12: (  4,  4,  4,  4) #04040404 graya(4,0.0156863)
         6: (  5,  5,  5,  5) #05050505 graya(5,0.0196078)
        16: (  6,  6,  6,  6) #06060606 graya(6,0.0235294)
        12: (  7,  7,  7,  7) #07070707 graya(7,0.027451)
         5: (  8,  8,  8,  8) #08080808 graya(8,0.0313725)
        10: (  9,  9,  9,  9) #09090909 graya(9,0.0352941)
       258: ( 10, 10, 10, 10) #0A0A0A0A graya(10,0.0392157)
        29: ( 11, 11, 11, 11) #0B0B0B0B graya(11,0.0431373)
        11: ( 12, 12, 12, 12) #0C0C0C0C graya(12,0.0470588)
        14: ( 13, 13, 13, 13) #0D0D0D0D graya(13,0.0509804)
        58: ( 14, 14, 14, 14) #0E0E0E0E graya(14,0.054902)
       103: ( 15, 15, 15, 15) #0F0F0F0F graya(15,0.0588235)
        84: ( 16, 16, 16, 16) #10101010 graya(16,0.0627451)
        76: ( 17, 17, 17, 17) #11111111 graya(17,0.0666667)
        63: ( 18, 18, 18, 18) #12121212 graya(18,0.0705882)
        48: ( 19, 19, 19, 19) #13131313 graya(19,0.0745098)
        45: ( 20, 20, 20, 20) #14141414 graya(20,0.0784314)
        41: ( 21, 21, 21, 21) #15151515 graya(21,0.0823529)
        30: ( 22, 22, 22, 22) #16161616 graya(22,0.0862745)
         6: ( 23, 23, 23, 23) #17171717 graya(23,0.0901961)
  Rendering intent: Perceptual
  Gamma: 0.454545
  Chromaticity:
    red primary: (0.64,0.33)
    green primary: (0.3,0.6)
    blue primary: (0.15,0.06)
    white point: (0.3127,0.329)
  Background color: graya(255,1)
  Border color: graya(223,1)
  Matte color: graya(189,1)
  Transparent color: graya(0,0)
  Interlace: None
  Intensity: Undefined
  Compose: Over
  Page geometry: 117x117+0+0
  Dispose: Undefined
  Iterations: 0
  Compression: Zip
  Orientation: Undefined
  Properties:
    date:create: 2019-05-24T11:40:44+02:00
    date:modify: 2019-05-24T11:40:44+02:00
    png:IHDR.bit-depth-orig: 8
    png:IHDR.bit_depth: 8
    png:IHDR.color-type-orig: 6
    png:IHDR.color_type: 6 (RGBA)
    png:IHDR.interlace_method: 0 (Not interlaced)
    png:IHDR.width,height: 117, 117
    png:pHYs: x_res=2835, y_res=2835, units=1
    png:sRGB: intent=0 (Perceptual Intent)
    signature: 0d8b7d63f3ecde905ba6562739368498e6078a10ad2e197e6b53e693fb871a71
  Artifacts:
    filename: ./Processing-Output_0001.png
    verbose: true
  Tainted: False
  Filesize: 757B
  Number pixels: 13.7K
  User time: 0.000u
  Elapsed time: 0:01.000

It seems that when this is the case the file is stored with premultiplied alpha.

Checking doesn't seem to be related to the node group. But in the script the socket type is configured to be a value. And it seems that somewhere in the file output node a single value buffer is stored as (a, a, a, a) ``` Image: ./Processing-Output_0001.png Format: PNG (Portable Network Graphics) Mime type: image/png Class: DirectClass Geometry: 117x117+0+0 Resolution: 28.35x28.35 Print size: 4.12698x4.12698 Units: PixelsPerCentimeter Type: GrayscaleAlpha Endianess: Undefined Colorspace: sRGB Depth: 8-bit Channel depth: gray: 8-bit alpha: 8-bit Channel statistics: Pixels: 13689 Gray: min: 0 (0) max: 23 (0.0901961) mean: 0.970049 (0.00380411) standard deviation: 3.75195 (0.0147135) kurtosis: 14.5765 skewness: 3.93552 entropy: 0.138801 Alpha: min: 0 (0) max: 23 (0.0901961) mean: 0.970049 (0.00380411) standard deviation: 3.75195 (0.0147135) kurtosis: 14.5765 skewness: -3.93552 entropy: 0.138801 Alpha: graya(0,0) #00000000 Colors: 24 Histogram: 12716: ( 0, 0, 0, 0) #00000000 graya(0,0) 19: ( 1, 1, 1, 1) #01010101 graya(1,0.00392157) 20: ( 2, 2, 2, 2) #02020202 graya(2,0.00784314) 7: ( 3, 3, 3, 3) #03030303 graya(3,0.0117647) 12: ( 4, 4, 4, 4) #04040404 graya(4,0.0156863) 6: ( 5, 5, 5, 5) #05050505 graya(5,0.0196078) 16: ( 6, 6, 6, 6) #06060606 graya(6,0.0235294) 12: ( 7, 7, 7, 7) #07070707 graya(7,0.027451) 5: ( 8, 8, 8, 8) #08080808 graya(8,0.0313725) 10: ( 9, 9, 9, 9) #09090909 graya(9,0.0352941) 258: ( 10, 10, 10, 10) #0A0A0A0A graya(10,0.0392157) 29: ( 11, 11, 11, 11) #0B0B0B0B graya(11,0.0431373) 11: ( 12, 12, 12, 12) #0C0C0C0C graya(12,0.0470588) 14: ( 13, 13, 13, 13) #0D0D0D0D graya(13,0.0509804) 58: ( 14, 14, 14, 14) #0E0E0E0E graya(14,0.054902) 103: ( 15, 15, 15, 15) #0F0F0F0F graya(15,0.0588235) 84: ( 16, 16, 16, 16) #10101010 graya(16,0.0627451) 76: ( 17, 17, 17, 17) #11111111 graya(17,0.0666667) 63: ( 18, 18, 18, 18) #12121212 graya(18,0.0705882) 48: ( 19, 19, 19, 19) #13131313 graya(19,0.0745098) 45: ( 20, 20, 20, 20) #14141414 graya(20,0.0784314) 41: ( 21, 21, 21, 21) #15151515 graya(21,0.0823529) 30: ( 22, 22, 22, 22) #16161616 graya(22,0.0862745) 6: ( 23, 23, 23, 23) #17171717 graya(23,0.0901961) Rendering intent: Perceptual Gamma: 0.454545 Chromaticity: red primary: (0.64,0.33) green primary: (0.3,0.6) blue primary: (0.15,0.06) white point: (0.3127,0.329) Background color: graya(255,1) Border color: graya(223,1) Matte color: graya(189,1) Transparent color: graya(0,0) Interlace: None Intensity: Undefined Compose: Over Page geometry: 117x117+0+0 Dispose: Undefined Iterations: 0 Compression: Zip Orientation: Undefined Properties: date:create: 2019-05-24T11:40:44+02:00 date:modify: 2019-05-24T11:40:44+02:00 png:IHDR.bit-depth-orig: 8 png:IHDR.bit_depth: 8 png:IHDR.color-type-orig: 6 png:IHDR.color_type: 6 (RGBA) png:IHDR.interlace_method: 0 (Not interlaced) png:IHDR.width,height: 117, 117 png:pHYs: x_res=2835, y_res=2835, units=1 png:sRGB: intent=0 (Perceptual Intent) signature: 0d8b7d63f3ecde905ba6562739368498e6078a10ad2e197e6b53e693fb871a71 Artifacts: filename: ./Processing-Output_0001.png verbose: true Tainted: False Filesize: 757B Number pixels: 13.7K User time: 0.000u Elapsed time: 0:01.000 ``` It seems that when this is the case the file is stored with premultiplied alpha.

Jeroen Bakker commented

2019-05-24 12:15:07 +02:00

With this node graph:

Execution graph before saving

Execution graph after reload

Which one would be the expected one. seems not to be Deterministic.
I would say that the conversion to BW is what is expected.

With this node graph: ![image.png](https://archive.blender.org/developer/F7065208/image.png) Execution graph before saving ![image.png](https://archive.blender.org/developer/F7065192/image.png) Execution graph after reload ![image.png](https://archive.blender.org/developer/F7065194/image.png) Which one would be the expected one. seems not to be Deterministic. I would say that the conversion to BW is what is expected.

Jeroen Bakker commented

2019-06-18 11:20:40 +02:00

Changed status from 'Open' to: 'Resolved'

Jeroen Bakker closed this issue

2019-06-18 11:20:40 +02:00

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Script-generated compositor node groups don't update #63050