Viewport 3d is not updated with VSE driver #70900
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Reference: blender/blender#70900
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Blender Version
Broken: 2.82 (unknown which revision, custom build without buildinfo)
Worked: (unknown)
system-info.txt
Short description of error
Viewport is not updated for a material that is driven by a VSE driver.
Exact steps for others to reproduce the error
ejemplo.zip
Changing the VSE strip opacity doesn't update the viewport.
More info from user
I am creating an addon to transform eevee into a VSE. I encountered several problems, and one is that by changing the values "chanel", "opacity" or moving the strip (it should disappear). the changes are not visible until the 3d view is moved. Just there it is updated. This makes it uncomfortable to work with the addon. The only change that works well is when changing the resolution X of the render, when playing the video or scrolling through the timeline, everything looks correctly.
Everything is being controlled by drivers.
Added subscriber: @DanteLeoncini
Added subscriber: @iss
I can confirm change of opacity not working.
But I would need exact step to reproduce issue you have with drivers. I can play around, but exact steps may help me find issue more quickly.
Added subscriber: @Jeroen-Bakker
Lowering to low as this is an edge case.
Changed status from 'Confirmed' to: 'Needs User Info'
you have to create a plane with a material.
The material has a "mix shader" that controls the opacity. The factor is controlled with a driver: https://i.ibb.co/YTMBtn0/Captura-de-pantalla-de-2020-01-03-13-37-04.png
the driver has the corresponding strip value. in this case, the opacity of the strip in the VSE
Material:
but opacity is not the only thing that doesn't work well. to movel the strip chanel. we would have to move the plane in the 3d view and it doesn't happen until we move in the timeline.
That is also controlled by a driver. in this case the position of the plane according to the strip channel
and what works halfway. It is the visibility of the plane. according to whether the Strip is visible in the VSE. by moving through the timeline or playing the animation. everything works correctly. but if we move the Strip out of sight. the plane remains visible until we move in the timeline. The driver is a bit more complex than the previous ones: https://i.ibb.co/7KHXFxZ/Captura-de-pantalla-de-2020-01-03-13-54-49.png
I guess the 3 problems are the same. but I do not know
Changed status from 'Needs User Info' to: 'Confirmed'
Changed status from 'Confirmed' to: 'Needs Developer To Reproduce'
Added subscriber: @dr.sybren
I would like to let the animation team do this triaging as this is an edge case and I am not aware of what is be supported and what not. @dr.sybren can you have a look at this report.
Changed status from 'Needs Developer To Reproduce' to: 'Archived'
This report does not contain all the requested information, which is required for us to investigate the issue. At least include the Blender version in which you observed the bug, and make sure you test with the latest daily build from https://builder.blender.org/download/.
Please submit a new report and carefully follow the instructions. Be sure to provide system information, Blender version, the last Blender version which worked, and a .blend file with exact steps to reproduce the problem.
A guideline for making a good bug report can be found at https://wiki.blender.org/wiki/Process/Bug_Reports
Added subscriber: @dfelinto
Changed status from 'Archived' to: 'Confirmed'
Just as an example of something that does work, this is an eevee material driven by a scene custom property:
eevee_material_drive.blend
What doesn't work, as reported here, is to use
sequence_editor.sequences_all["image.png"].blend_alpha
to drive a shader property is not working (it updates the UI but not the material).If this is indeed not supported the documentation should mention that not all properties are supported and the reason for that:
https://docs.blender.org/manual/en/latest/animation/drivers/drivers_panel.html#driver-variables
(marking as confirmed then, to either have the docs fixed or classified as bug or known issue)
viewport 3d is not updated with VSE driverto Viewport 3d is not updated with VSE driverI did not understand. Do you want me to report it again or for more information? I made a video that shows the problem and how to reproduce it. Video
the problem occurs in blender 2.8 and 2.82.6 over ubuntu 18.04lts. I had already attached a file with the blender version and system information. I add an updated one system-info.txt
Please write the steps to reproduce this issue. This is much faster for developers to read, and also allows the search engine to recognise keywords and let others find the issue based on those keywords. Although a video can clarify some things, having a step-by-step description generally is faster to understand.
That file didn't contain the build hash, so it could have been any self-built version. Daily builds from the buildbot do include this hash.
"Blender 2.8" was more of a term for the development project, it's not a concrete version. Do you mean the 2.80 release?
This works, I don't think it's the proper solution as no code in
blendkernel
callsWM_main_add_notifier()
.This issue might be related to #72143, but that one isn't fixed with the above hack.
Added subscriber: @MarcelLegindi
system-info.txt I think this is new Sysinfo. I am now with an alpha version of Blender 2.83 hash:
f051d47cdb
(previous versions had the error)steps to reproduce the error:
The variable "var" has to be the "data path" copied. in the current scene (attached an image if it is not clear)
With that you can reproduce the error. when changing the opacity of the strip in the blender VSE. in the 3d view no change occurs. the change looks just when one moves in the timeline
The rest of the errors I mentioned are similar. I calculate that they are all the same problem. sorry for late reply
I just realized something weird. if in the previous example I try to move the mix shader factor and quickly start changing the opacity of the strip. the changes are seen in real time for a few seconds until the 3d view "stops updating"