Grease Pencil 3d space problem #60325

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Łukasz · 2019-01-08T17:18:29+01:00

Łukasz commented

2019-01-08 17:18:29 +01:00

System Information
Operating system: Windows 7 64x
Graphics card: nvidia gts 250

Blender Version
Latest one from the download section.

I had a plan to paint over the color on a 3d sculpted head with a grease pencil. The thing is grease pencil in my scene do not obey 3d space order instead it show the stroke that was painted last in front of camera(does't matter if its in front or back of the head). Someone had that problem perhaps ? head overpaint test.blend

test grease0001-0075.mkv

**System Information** Operating system: Windows 7 64x Graphics card: nvidia gts 250 **Blender Version** Latest one from the download section. I had a plan to paint over the color on a 3d sculpted head with a grease pencil. The thing is grease pencil in my scene do not obey 3d space order instead it show the stroke that was painted last in front of camera(does't matter if its in front or back of the head). Someone had that problem perhaps ? [head overpaint test.blend](https://archive.blender.org/developer/F6221471/head_overpaint__test.blend) [test grease0001-0075.mkv](https://archive.blender.org/developer/F6221476/test_grease0001-0075.mkv)

Łukasz commented

2019-01-08 17:18:29 +01:00

Added subscriber: @skarlok

Łukasz changed title from ~~Grease Pencil~~ to Grease Pencil 3d space problem

2019-01-08 17:18:58 +01:00

Antonio Vazquez commented

2019-01-08 17:32:30 +01:00

Added subscriber: @antoniov

Antonio Vazquez commented

2019-01-08 17:32:30 +01:00

I have tested your drawing and I think you try to do something against the design of grease pencil object.

Grease pencil object is a 2D environment in a 3D space, that means that 2D data is over 3D data. In your drawing, the hair looks that was drawn after head (you can try it setting to back the hair strokes). As the strokes of the hair were drawn after the head, they will be always on top (in 2d last drawn is on top always).

The relationship with 3D is between objects, but inside one GP object, the 3D space disappears (I mean, the position of the stroke is less important than real 3D position). This is done on purpose after a very long time of analysis and studying 2D problems, so it wasn't a trivial decision.

I have tested your drawing and I think you try to do something against the design of grease pencil object. Grease pencil object is a 2D environment in a 3D space, that means that 2D data is over 3D data. In your drawing, the hair looks that was drawn after head (you can try it setting to back the hair strokes). As the strokes of the hair were drawn after the head, they will be always on top (in 2d last drawn is on top always). The relationship with 3D is between objects, but inside one GP object, the 3D space disappears (I mean, the position of the stroke is less important than real 3D position). This is done on purpose after a very long time of analysis and studying 2D problems, so it wasn't a trivial decision.

Łukasz commented

2019-01-08 22:11:40 +01:00

Is there any other way around to achieve the effect in Blender 2.8 that i was hoping to get in the end of that project? My goal was to fully paint it with loose strokes (add light and shadow). So it could be a turnable object ?

My first attempt with grease ended like that.

But it was on a flat space so i wanted to go further with the tool and started with that head project.
To be honest i think it could be nice to paint like this in 3d space. For example turnable background object for animation?

Is there any other way around to achieve the effect in Blender 2.8 that i was hoping to get in the end of that project? My goal was to fully paint it with loose strokes (add light and shadow). So it could be a turnable object ? My first attempt with grease ended like that. ![female-sketch.png](https://archive.blender.org/developer/F6223301/female-sketch.png) But it was on a flat space so i wanted to go further with the tool and started with that head project. To be honest i think it could be nice to paint like this in 3d space. For example turnable background object for animation?

Sebastian Parborg commented

2019-03-02 13:55:08 +01:00

Added subscriber: @ZedDB

Sebastian Parborg commented

2019-03-02 13:55:08 +01:00

@antoniov so is this solved with the commit you mentioned?

Antonio Vazquez commented

2019-03-03 09:24:55 +01:00

@ZedDB Yes and no. The problem with opaque strokes yes, but if stroke use alpha no, but this is related to a more general alpha issue.

Antonio Vazquez was assigned by Sebastian Parborg

2019-03-03 10:26:57 +01:00

Enzio Probst commented

2019-05-24 18:03:58 +02:00

Added subscriber: @EnzioProbst

Enzio Probst commented

2019-05-24 18:22:07 +02:00

Wrong z-testing only happens to Grase pencil Stroke, not to alpha blend material.
I wonder whats the difference in rendering.
As the sphere is opaque it writes to z-buffer, so if alpha blend shader does depth testing against z-buffer it should be occluded correctly.

grease_pencil_depth_sorting.blend

Wrong z-testing only happens to Grase pencil Stroke, not to alpha blend material. I wonder whats the difference in rendering. As the sphere is opaque it writes to z-buffer, so if alpha blend shader does depth testing against z-buffer it should be occluded correctly. ![image.png](https://archive.blender.org/developer/F7065905/image.png) [grease_pencil_depth_sorting.blend](https://archive.blender.org/developer/F7065888/grease_pencil_depth_sorting.blend)

Antonio Vazquez was unassigned by Dalai Felinto

2019-12-23 16:35:26 +01:00

Antonio Vazquez commented

2019-12-28 09:52:06 +01:00

Closed as duplicate of #66293

Antonio Vazquez closed this issue

2019-12-28 09:52:06 +01:00

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Grease Pencil 3d space problem #60325