Grease Pencil render with Cycles fails #57579

New Issue

Antonio Vazquez · 2018-11-02T10:58:10+01:00

Antonio Vazquez commented

2018-11-02 10:58:10 +01:00

Since an undetermined date, when renders a scene with GP objects with cycles, the GP objects don't appear in the final output.

Doing debug, if you add a break point in for example in DRW_render_object_iter() in GPENCIL_render_to_image() funtion, works.

Nothing has been changed in the render pipeline in the grease pencil code, so something related to multi-threading or something else is the reason of the bug.

Since an undetermined date, when renders a scene with GP objects with cycles, the GP objects don't appear in the final output. Doing debug, if you add a break point in for example in DRW_render_object_iter() in GPENCIL_render_to_image() funtion, works. Nothing has been changed in the render pipeline in the grease pencil code, so something related to multi-threading or something else is the reason of the bug.

Antonio Vazquez commented

2018-11-02 10:58:10 +01:00

Added subscriber: @antoniov

Antonio Vazquez commented

2018-11-02 10:58:59 +01:00

Added subscriber: @brecht

Antonio Vazquez commented

2018-11-02 10:59:00 +01:00

@brecht Could you take a look?

I did a full debug and the grease pencil code is ran as expected, so not sure what is going on here.

@brecht Could you take a look? I did a full debug and the grease pencil code is ran as expected, so not sure what is going on here.

Philipp Oeser commented

2018-11-02 13:28:37 +01:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2018-11-02 13:28:37 +01:00

ba36e901 was still working, bisecting now...

ba36e901 was still working, bisecting now...

Philipp Oeser commented

2018-11-02 14:44:21 +01:00

just noticed: first render is often OK (at least for me as of f2873b3ce5), however hitting F12 a second time will fail.

@antoniov : looks like this is caused by 541d07045b [not sure if you want to try to fix yourself?]

just noticed: first render is often OK (at least for me as of f2873b3ce5), however hitting F12 a second time will fail. @antoniov : looks like this is caused by 541d07045b [not sure if you want to try to fix yourself?]

Antonio Vazquez was assigned by Philipp Oeser

2018-11-02 14:45:36 +01:00

Philipp Oeser commented

2018-11-02 14:45:36 +01:00

I'll assign you first

Antonio Vazquez commented

2018-11-02 15:15:22 +01:00

@lichtwerk Yes, better I look at 2nd F12 error before

Antonio Vazquez commented

2018-11-03 18:10:00 +01:00

@lichtwerk If I render using F12 without change of render engine works all the times.

I only got an error when switch to OPenGL render after doing a render using other engine.

The error is when discard the batch.

32: gpu_context_remove_batch - 0x2474D1A0
31: GPU_batch_vao_cache_clear - 0x24767E70
30: GPU_batch_discard - 0x24767D40
29: gpencil_batch_cache_clear - 0x247FAE60
28: gpencil_batch_cache_get - 0x247FA6D0

Do you know what could be the reason?

I have debug an error in this line of gpu_batch.c (batch->context was NULL)

/* Make sure you are not trying to draw this batch in another context. */
		assert(batch->context == GPU_context_active_get());

@lichtwerk If I render using F12 without change of render engine works all the times. I only got an error when switch to OPenGL render after doing a render using other engine. The error is when discard the batch. ``` 32: gpu_context_remove_batch - 0x2474D1A0 31: GPU_batch_vao_cache_clear - 0x24767E70 30: GPU_batch_discard - 0x24767D40 29: gpencil_batch_cache_clear - 0x247FAE60 28: gpencil_batch_cache_get - 0x247FA6D0 ``` Do you know what could be the reason? I have debug an error in this line of gpu_batch.c (batch->context was NULL) ``` /* Make sure you are not trying to draw this batch in another context. */ assert(batch->context == GPU_context_active_get()); ``` ![image.png](https://archive.blender.org/developer/F5353690/image.png)

Antonio Vazquez commented

2018-11-06 12:51:04 +01:00

@lichtwerk I don't get the error with F12, but I have seen something that maybe can help us.

If you render with the Display Mode in New Window, does not work, but if you render with Image Editor, works. Does this has sense for you?

@lichtwerk I don't get the error with F12, but I have seen something that maybe can help us. If you render with the Display Mode in New Window, does not work, but if you render with Image Editor, works. Does this has sense for you?

Brecht Van Lommel commented

2018-11-06 12:57:07 +01:00

Added subscriber: @fclem

Brecht Van Lommel commented

2018-11-06 12:57:07 +01:00

The errors says the batch was created for one OpenGL context but is being freed in another context. When it works the context likely happens to be active from an earlier operation (drawing the window, rendering with Eevee, ..).

@fclem probably has a better idea of how OpenGL contexts are supposed to be activated in this case.

The errors says the batch was created for one OpenGL context but is being freed in another context. When it works the context likely happens to be active from an earlier operation (drawing the window, rendering with Eevee, ..). @fclem probably has a better idea of how OpenGL contexts are supposed to be activated in this case.

Philipp Oeser commented

2018-11-06 13:16:07 +01:00

@antoniov : can only confirm that rendering to a New Window seems to be the cause (otherwise seems fine as you found), but I havent looked deeper...

Brecht Van Lommel commented

2019-03-26 05:03:27 +01:00

Changed status from 'Open' to: 'Resolved'

Brecht Van Lommel closed this issue

2019-03-26 05:03:27 +01:00

Brecht Van Lommel commented

2019-03-26 05:03:27 +01:00

This appears to be working now.

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 render with Cycles fails #57579