Grease pencil frames not rendered in background mode #85035

New Issue

Damien Picard · 2021-01-25T11:40:37+01:00

Damien Picard commented

2021-01-25 11:40:37 +01:00

System Information
Operating system: Kubuntu 20.04, Windows 10
Graphics card: GeForce GTX 970/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 450.102.04

Blender Version
Broken: version: 2.91.2, branch: master, commit date: 2021-01-19 16:15, hash: 5be9ef4177
Broken: version: 2.93.0 Alpha, branch: master (modified), commit date: 2021-01-25 09:32, hash: 5f55022276
Worked: version: 2.83.9, branch: master, commit date: 2020-11-11 06:30, hash: 4abfc0bcd5

Short description of error
In a very specific configuration, some grease pencil frames are only rendered in graphical mode, but not in background mode. It apparently involves saving the file with the current frame before the first animation frame.

Exact steps for others to reproduce the error
grease_pencil_render_bug.blend

Open the attached file, and press CTRL + F12 to render the animation
- In the resulting file, all frames are correctly rendered
Render the same file in the background by using the following command:

`blender --factory-startup -b grease_pencil_render_bug.blend -a`

Keyframe 103 is skipped, and keyframe 105 appears only at frame 106.

OR

Create new 2D animation file
Set first frame to 101, last frame to 110
Draw something at frames 101, 103, 105, 107, 110
Delete existing frame 1
Set the current frame to before the first frame (e.g. 60)
Save file
Press CTRL + F12 to render the animation
- In the resulting file, all frames are correctly rendered
Render the same file in the background by using the following command:

`blender --factory-startup -b grease_pencil_render_bug.blend -a`

Frames 103-105 are skipped.

Here are the resulting animations
Rendered in the foreground, expected:

Rendered in the background, frames 103-105 skipped:

**System Information** Operating system: Kubuntu 20.04, Windows 10 Graphics card: GeForce GTX 970/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 450.102.04 **Blender Version** Broken: version: 2.91.2, branch: master, commit date: 2021-01-19 16:15, hash: `5be9ef4177` Broken: version: 2.93.0 Alpha, branch: master (modified), commit date: 2021-01-25 09:32, hash: `5f55022276` Worked: version: 2.83.9, branch: master, commit date: 2020-11-11 06:30, hash: `4abfc0bcd5` **Short description of error** In a very specific configuration, some grease pencil frames are only rendered in graphical mode, but not in background mode. It apparently involves saving the file with the current frame before the first animation frame. **Exact steps for others to reproduce the error** [grease_pencil_render_bug.blend](https://archive.blender.org/developer/F9596830/grease_pencil_render_bug.blend) * Open the attached file, and press CTRL + F12 to render the animation * In the resulting file, all frames are correctly rendered * Render the same file in the background by using the following command: ``` `blender --factory-startup -b grease_pencil_render_bug.blend -a` ``` * Keyframe 103 is skipped, and keyframe 105 appears only at frame 106. **OR** * Create new 2D animation file * Set first frame to 101, last frame to 110 * Draw something at frames 101, 103, 105, 107, 110 * Delete existing frame 1 * Set the current frame to before the first frame (e.g. 60) * Save file * Press CTRL + F12 to render the animation * In the resulting file, all frames are correctly rendered * Render the same file in the background by using the following command: ``` `blender --factory-startup -b grease_pencil_render_bug.blend -a` ``` * Frames 103-105 are skipped. **Here are the resulting animations** Rendered in the foreground, expected: ![fg.gif](https://archive.blender.org/developer/F9596835/fg.gif) Rendered in the background, frames 103-105 skipped: ![bg.gif](https://archive.blender.org/developer/F9596838/bg.gif)

Damien Picard commented

2021-01-25 11:40:37 +01:00

Added subscriber: @pioverfour

Falk David commented

2021-01-25 15:46:55 +01:00

Added subscriber: @filedescriptor

Falk David commented

2021-01-25 15:46:55 +01:00

Changed status from 'Needs Triage' to: 'Confirmed'

Falk David commented

2021-01-25 15:46:55 +01:00

I can reproduce this on 2.92.0 Beta, branch: master, commit date: 2021-01-25 06:40, hash: 7f9ed0178a. If the file is saved with the play-head inside the start and end frame it renders as expected in background mode. But when I save the file with the play-head before the start frame, the first 5 images are all the same.

I can reproduce this on 2.92.0 Beta, branch: master, commit date: 2021-01-25 06:40, hash: `7f9ed0178a`. If the file is saved with the play-head inside the start and end frame it renders as expected in background mode. But when I save the file with the play-head before the start frame, the first 5 images are all the same.

Damien Picard commented

2021-01-26 11:20:22 +01:00

For anyone encountering this bug, a workaround is to set the current frame to the first frame prior to rendering:

blender -b grease_pencil_render_bug.blend --python-expr "import bpy \
bpy.context.scene.frame_set(bpy.context.scene.frame_start)" -a

For anyone encountering this bug, a workaround is to set the current frame to the first frame prior to rendering: ``` blender -b grease_pencil_render_bug.blend --python-expr "import bpy \ bpy.context.scene.frame_set(bpy.context.scene.frame_start)" -a ```

Damien Picard commented

2021-01-26 15:15:05 +01:00

Added subscriber: @antoniov

Damien Picard commented

2021-01-26 15:15:05 +01:00

@antoniov, I bisected this to 11ba9eec70.

@antoniov, I bisected this to 11ba9eec70.

Antonio Vazquez commented

2021-01-27 09:49:42 +01:00

@pioverfour This commit cannot be the reason of the error because this limits the first frame to draw, so if you are in frame 60, nothing of frame 101 is displayed as it was before.

I have just recompile 2.92 master and running this command line blender.exe --factory-startup -b grease_pencil_render_bug.blend -a and I get the right result in .mp4 and .png format.

Edit: I run again and now get wrong frames.

@pioverfour This commit cannot be the reason of the error because this limits the first frame to draw, so if you are in frame 60, nothing of frame 101 is displayed as it was before. I have just recompile 2.92 master and running this command line `blender.exe --factory-startup -b grease_pencil_render_bug.blend -a` and I get the right result in `.mp4` and `.png` format. Edit: I run again and now get wrong frames.

blender-admin commented

2021-01-28 10:35:03 +01:00

This issue was referenced by 1e55d28a4e

This issue was referenced by 1e55d28a4e244cd501d9b53f56d535a04ce5eef1

blender-admin commented

2021-01-28 10:35:03 +01:00

This issue was referenced by b379f626ce

This issue was referenced by b379f626ce3ec965984a6758ae4e52b7c0dbcc2a

Antonio Vazquez commented

2021-01-28 10:37:49 +01:00

Changed status from 'Confirmed' to: 'Resolved'

Antonio Vazquez closed this issue

2021-01-28 10:37:49 +01:00

Antonio Vazquez self-assigned this 2021-01-28 10:37:49 +01:00

Sign in to join this conversation.

No Label

Download

What's New

Blender Studio

Manual

Developers Blog

Documentation

Benchmark

Blender Conference

Development Fund

One-time Donations

Grease pencil frames not rendered in background mode #85035