Grease Pencil consistent crash #44412

New Issue

Daniel Houghton · 2015-04-16T16:20:42+02:00

Daniel Houghton commented

2015-04-16 16:20:42 +02:00

System Information
OSX 10.10.3 MacBook Pro (Retina, 15-inch, Mid 2014)
Intel Iris Pro 1536MB

Blender Version
Broken: 2.74
Worked: (optional)

Short description of error
In a first experiment with the exciting new animatable grease pencil tools I seem to have created a situation that consistently crashes Blender with the error: "frame (1) existed already for this layer." I've attached the crash.txt file
storyboard.crash.txt
and the .blend file causing the issue
storyboard.blend

Exact steps for others to reproduce the error
open storyboard.blend
frame forward to frame 2 with the right arrow key
the word "Collinwood" should shrink
this shrinking is unexpected, and seems buggy, but doesn't yet cause the crash.
now go to frame 1
hold down the D key and left click to draw a grease pencil stroke.
Blender should crash.

Thank you for taking a look at this!
I'm excited by the possibility of the new grease pencil tools.
Daniel

**System Information** OSX 10.10.3 MacBook Pro (Retina, 15-inch, Mid 2014) Intel Iris Pro 1536MB **Blender Version** Broken: 2.74 Worked: (optional) **Short description of error** In a first experiment with the exciting new animatable grease pencil tools I seem to have created a situation that consistently crashes Blender with the error: "frame (1) existed already for this layer." I've attached the crash.txt file [storyboard.crash.txt](https://archive.blender.org/developer/F163082/storyboard.crash.txt) and the .blend file causing the issue [storyboard.blend](https://archive.blender.org/developer/F163083/storyboard.blend) **Exact steps for others to reproduce the error** open storyboard.blend frame forward to frame 2 with the right arrow key the word "Collinwood" should shrink this shrinking is unexpected, and seems buggy, but doesn't yet cause the crash. now go to frame 1 hold down the D key and left click to draw a grease pencil stroke. Blender should crash. Thank you for taking a look at this! I'm excited by the possibility of the new grease pencil tools. Daniel

Daniel Houghton commented

2015-04-16 16:20:42 +02:00

Changed status to: 'Open'

Daniel Houghton commented

2015-04-16 16:20:42 +02:00

Added subscriber: @DanielHoughton

Daniel Houghton commented

2015-04-16 16:51:14 +02:00

Quick followup.

It looks like a Grease Pencil fill layer draws on top of other strokes, even when X Ray is off for all grease pencil layers and it is behind the other strokes.

storyboard_fill.blend

The attached .blend demonstrates this case. Just orbit the view to see the layering issue.

Thank you again! And please let me know if there is anything I can do to help.
Daniel

Quick followup. It looks like a Grease Pencil fill layer draws on top of other strokes, even when X Ray is off for all grease pencil layers and it is behind the other strokes. [storyboard_fill.blend](https://archive.blender.org/developer/F163094/storyboard_fill.blend) The attached .blend demonstrates this case. Just orbit the view to see the layering issue. Thank you again! And please let me know if there is anything I can do to help. Daniel

Antonis Ryakiotakis commented

2015-04-16 17:09:02 +02:00

Added subscriber: @Psy-Fi

Antonis Ryakiotakis commented

2015-04-16 17:09:02 +02:00

Looks like we have a GL error somewhere, getting a gpu report

Antonis Ryakiotakis commented

2015-04-16 18:35:45 +02:00

Confirmed and assigning to Joshua

Joshua Leung was assigned by Antonis Ryakiotakis

2015-04-16 18:35:59 +02:00

Julian Eisel commented

2015-04-16 18:36:42 +02:00

Added subscriber: @JulianEisel

blender-admin commented

2015-04-17 03:32:57 +02:00

This issue was referenced by 09f2aa9382

This issue was referenced by 09f2aa938248bedebf7e801fabd833055627fe46

Joshua Leung commented

2015-04-17 03:58:07 +02:00

Changed status from 'Open' to: 'Resolved'

Joshua Leung closed this issue

2015-04-17 03:58:07 +02:00

Joshua Leung commented

2015-04-17 03:58:07 +02:00

Closed by commit 09f2aa9382.

Closed by commit 09f2aa9382.

Joshua Leung commented

2015-04-17 04:05:12 +02:00

About the crashing file:
Looking into your file, there are two drawings on frames 1 and 0, in that order. Under ordinary circumstances, the Grease Pencil tool expects that these are ordered in chronological ascending order (i.e. 0 then 1); most of the problems can be attributed to this. I've just committed some fixes to prevent this from crashing, and also to fix other weirdness I found around here (i.e. problems trying to draw on frame 0).

Perhaps the bigger issue here is how your file got into this state in the first place, since this really shouldn't happen.

To ensure that they are all sorted in the right order, go to the Dopesheet, change in to the "Grease Pencil" mode, then select all keyframes, G to start a transform (both don't move the mouse), then click to confirm. This will force all the selected keyframes to get sorted once, so that they resolve correctly again.

About the fill issue:
I've run into this one myself, and agree it's confusing. At the time, I figured that it was really just an artifact of the fact that strokes on one layer are drawn completely before the next layer's strokes are drawn. The net result is that the last-drawn layer should "win", especially when they are on different planes.

About the crashing file: Looking into your file, there are two drawings on frames 1 and 0, in *that* order. Under ordinary circumstances, the Grease Pencil tool expects that these are ordered in chronological ascending order (i.e. 0 then 1); most of the problems can be attributed to this. I've just committed some fixes to prevent this from crashing, and also to fix other weirdness I found around here (i.e. problems trying to draw on frame 0). Perhaps the bigger issue here is how your file got into this state in the first place, since this really shouldn't happen. To ensure that they are all sorted in the right order, go to the Dopesheet, change in to the "Grease Pencil" mode, then select all keyframes, G to start a transform (both don't move the mouse), then click to confirm. This will force all the selected keyframes to get sorted once, so that they resolve correctly again. About the fill issue: I've run into this one myself, and agree it's confusing. At the time, I figured that it was really just an artifact of the fact that strokes on one layer are drawn completely before the next layer's strokes are drawn. The net result is that the last-drawn layer should "win", especially when they are on different planes.

Daniel Houghton commented

2015-04-17 15:21:53 +02:00

Aligorith,

Thank you for taking a look at it!
I tried sorting the grease pencil keys in the dopesheet and that definitely stopped the crash, so thank you for the workaround.
I wish I could answer your bigger picture question of how it got into the problematic state, but I'm not sure.
And your last point about layering in the grease pencil tool helps explain the confusing drawing behavior. I see now that I was assuming that layering would work as it does in the 3d view, more as a visibility flag than as a mechanism for determining the drawing order.

I suppose I was thinking that the grease pencil layers could work sort of like color swatches, i.e. whenever you want white strokes, you draw on the white strokes with no fill layer, and whenever you want red strokes with yellow fill, you draw on the red/yellow layer.

If grease pencil layers are drawn to completion in the order that they are stacked, then I can never have white strokes both behind and on top of red strokes unless I make a duplicate white strokes layer.

Anyways, thank you so much for the tip. This lets me take off again with this storyboarding project. It really does seem like a useful and efficient tool.

Daniel

Aligorith, Thank you for taking a look at it! I tried sorting the grease pencil keys in the dopesheet and that definitely stopped the crash, so thank you for the workaround. I wish I could answer your bigger picture question of how it got into the problematic state, but I'm not sure. And your last point about layering in the grease pencil tool helps explain the confusing drawing behavior. I see now that I was assuming that layering would work as it does in the 3d view, more as a visibility flag than as a mechanism for determining the drawing order. I suppose I was thinking that the grease pencil layers could work sort of like color swatches, i.e. whenever you want white strokes, you draw on the white strokes with no fill layer, and whenever you want red strokes with yellow fill, you draw on the red/yellow layer. If grease pencil layers are drawn to completion in the order that they are stacked, then I can never have white strokes both behind and on top of red strokes unless I make a duplicate white strokes layer. Anyways, thank you so much for the tip. This lets me take off again with this storyboarding project. It really does seem like a useful and efficient tool. Daniel

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Grease Pencil consistent crash #44412