File Output Node does not write image file with EGL context #75072

New Issue

Christian Rauch · 2020-03-25T02:26:43+01:00

Christian Rauch commented

2020-03-25 02:26:43 +01:00

System Information
Operating system: Ubuntu 18.04
Graphics card: Intel Corporation HD Graphics 5500

Blender Version
Broken: master, at least since 2.82a
built from source: make lite debug developer ninja BUILD_CMAKE_ARGS="-DWITH_GL_EGL=ON"

Short description of error
When using the EGL context (on X11 with WITH_GL_EGL=ON or on SDL or Wayland), the File Output Node will not write the image file to the specified path.

Exact steps for others to reproduce the error

load the example blender file: test_render_file.blend
render image (F12)

Results
The rendered image will be shown in the blender GUI, but it will not be written to disk. Likewise, in background mode (blender -b test_render_file.blend) the file will not be written to disk with the EGL context.

Further, the rendered image in the GUI will have incorrect lighting.

Expected results (from X11 + GLX):

Actual results with (X11 + EGL, SDL or Wayland):

However, rendering without the File Output Node, e.g. via script

import bpy
scn = bpy.context.scene
scn.render.resolution_x = 320
scn.render.resolution_y = 240
scn.render.image_settings.file_format = 'PNG'
scn.render.filepath = "/tmp/image.png"
bpy.ops.render.render(write_still = True)

will write the file, albeit with the same lighting issues.

**System Information** Operating system: Ubuntu 18.04 Graphics card: Intel Corporation HD Graphics 5500 **Blender Version** Broken: master, at least since 2.82a built from source: `make lite debug developer ninja BUILD_CMAKE_ARGS="-DWITH_GL_EGL=ON"` **Short description of error** When using the EGL context (on X11 with `WITH_GL_EGL=ON` or on SDL or Wayland), the `File Output` Node will not write the image file to the specified path. **Exact steps for others to reproduce the error** 1. load the example blender file: [test_render_file.blend](https://archive.blender.org/developer/F8427723/test_render_file.blend) 2. render image (F12) **Results** The rendered image will be shown in the blender GUI, but it will not be written to disk. Likewise, in background mode (`blender -b test_render_file.blend`) the file will not be written to disk with the EGL context. Further, the rendered image in the GUI will have incorrect lighting. Expected results (from X11 + GLX): ![cube_OK.png](https://archive.blender.org/developer/F8427725/cube_OK.png) Actual results with (X11 + EGL, SDL or Wayland): ![cube_FAIL_EGL.png](https://archive.blender.org/developer/F8427727/cube_FAIL_EGL.png) However, rendering without the `File Output` Node, e.g. via script ``` import bpy scn = bpy.context.scene scn.render.resolution_x = 320 scn.render.resolution_y = 240 scn.render.image_settings.file_format = 'PNG' scn.render.filepath = "/tmp/image.png" bpy.ops.render.render(write_still = True) ``` will write the file, albeit with the same lighting issues.

Christian Rauch commented

2020-03-25 02:26:43 +01:00

Added subscriber: @christian.rauch

Christian Rauch commented

2020-03-25 02:59:10 +01:00

This might also be related to the specific build settings (lite debug developer).
However, there is no warning about missing functionality or similar to indicate what could have caused the wrong lighting and the missing file export.

This might also be related to the specific build settings (`lite debug developer`). However, there is no warning about missing functionality or similar to indicate what could have caused the wrong lighting and the missing file export.

Christian Rauch commented

2020-03-26 00:07:50 +01:00

It turns out that this was indeed related to the compilation settings and not EGL.

The WITH_OPENCOLORIO option fixes the lighting issues:
make lite ninja BUILD_CMAKE_ARGS="-DWITH_GL_EGL=ON -DWITH_BOOST=ON -DWITH_OPENCOLORIO=ON"
but the File Output node in the blend file does not write the file to disk, even though the script is able to do so.

In any case, Blender should show a warning when a requested feature is not available.

It turns out that this was indeed related to the compilation settings and not EGL. The `WITH_OPENCOLORIO` option fixes the lighting issues: `make lite ninja BUILD_CMAKE_ARGS="-DWITH_GL_EGL=ON -DWITH_BOOST=ON -DWITH_OPENCOLORIO=ON"` but the `File Output` node in the blend file does not write the file to disk, even though the script is able to do so. In any case, Blender should show a warning when a requested feature is not available.

Evan Wilson commented

2020-03-26 00:59:10 +01:00

Added subscriber: @EAW

Evan Wilson commented

2020-03-26 00:59:10 +01:00

DWITH_COMPOSITOR=ON

You can't use the File Output node if you don't build the compositor.

I agree that this is confusing, since you can still add all of the nodes you want in the compositor, they just don't do anything.

- DWITH_COMPOSITOR=ON You can't use the `File Output` node if you don't build the compositor. I agree that this is confusing, since you can still add all of the nodes you want in the compositor, they just don't do anything.

Christian Rauch commented

2020-03-26 01:36:06 +01:00

Thanks., In summary, these settings solve the described issues:
make lite ninja BUILD_CMAKE_ARGS="-DWITH_GL_EGL=ON -DWITH_BOOST=ON -DWITH_OPENCOLORIO=ON -DWITH_COMPOSITOR=ON"

Sorry about the confusion about EGL.

This issue is now about enabling warnings when trying to use a feature that is disabled.

Thanks., In summary, these settings solve the described issues: `make lite ninja BUILD_CMAKE_ARGS="-DWITH_GL_EGL=ON -DWITH_BOOST=ON -DWITH_OPENCOLORIO=ON -DWITH_COMPOSITOR=ON"` Sorry about the confusion about EGL. This issue is now about enabling warnings when trying to use a feature that is disabled.

Germano Cavalcante commented

2020-03-26 15:33:04 +01:00

Added subscriber: @mano-wii

Germano Cavalcante commented

2020-03-26 15:33:04 +01:00

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

Germano Cavalcante closed this issue

2020-03-26 15:33:04 +01:00

Germano Cavalcante self-assigned this 2020-03-26 15:33:04 +01:00

Germano Cavalcante commented

2020-03-26 15:33:04 +01:00

Although warnings are very useful, the lack of them is not considered an error or bug.
Feel free to propose a patch if you feel it is necessary and are willing to work on it: https://developer.blender.org/differential/diff/create/
Or use other channels for feature requests: https://wiki.blender.org/wiki/Communication/Contact#User_Feedback_and_Requests

Although warnings are very useful, the lack of them is not considered an error or bug. Feel free to propose a patch if you feel it is necessary and are willing to work on it: https://developer.blender.org/differential/diff/create/ Or use other channels for feature requests: https://wiki.blender.org/wiki/Communication/Contact#User_Feedback_and_Requests

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File Output Node does not write image file with EGL context #75072