Grease Pencil Reproject Strokes on surfaces from a camera's point of view is incorrectly placing the strokes on the Back Faces when canvas is intersecting the object #89101

Closed
opened 2021-06-13 05:26:41 +02:00 by Sahin Ersoz · 7 comments

System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: GeForce GTX 1080/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 457.51

Blender Version
Broken: version: 2.93.1 Release Candidate, branch: master, commit date: 2021-06-09 06:57, hash: 5730112174
Worked: 2.92

Short description of error
Grease Pencil Reproject Strokes on surfaces from a camera's point of view is incorrectly placing the strokes on the Back Faces when canvas is intersecting the object
I reported this before but the tread was closed and labeled resolved. However the the problem still persists in the release candidate. The key problem is projection from a camera's point of view.

Exact steps for others to reproduce the error
While the default cube and the camera still present, add the "Stroke" grease pencil object.
Press "Numpad 0" to switch to camera view.
Select the Grease pencil object and press "Tab" to enter the Edit Mode.
Press "A" to select all points of the grease pencil object.
Select from the top menu: Grease Pencil/Cleanup/Reproject Strokes
Choose "Surface" option.

In 2.93 and above versions the strokes are placed to the back faces of the cube instead of the front faces that are facing the camera.

ReprojectStrokes_Bug3.blend

Thank you for all your hard work and this excellent software!
SE

**System Information** Operating system: Windows-10-10.0.19041-SP0 64 Bits Graphics card: GeForce GTX 1080/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 457.51 **Blender Version** Broken: version: 2.93.1 Release Candidate, branch: master, commit date: 2021-06-09 06:57, hash: `5730112174` Worked: 2.92 **Short description of error** Grease Pencil Reproject Strokes on **surfaces** from a **camera's point of view** is incorrectly placing the strokes on the **Back Faces when canvas is intersecting the object** I reported this before but the tread was closed and labeled resolved. However the the problem still persists in the release candidate. The key problem is **projection from a camera's point of view**. **Exact steps for others to reproduce the error** While the default cube and the camera still present, add the "Stroke" grease pencil object. Press "Numpad 0" to switch to camera view. Select the Grease pencil object and press "Tab" to enter the Edit Mode. Press "A" to select all points of the grease pencil object. Select from the top menu: Grease Pencil/Cleanup/Reproject Strokes Choose "Surface" option. In 2.93 and above versions the strokes are placed to the back faces of the cube instead of the front faces that are facing the camera. [ReprojectStrokes_Bug3.blend](https://archive.blender.org/developer/F10168910/ReprojectStrokes_Bug3.blend) Thank you for all your hard work and this excellent software! SE
Author

Added subscriber: @sse

Added subscriber: @sse
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Added subscriber: @PratikPB2123

Added subscriber: @PratikPB2123
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Can reproduce on 2.93.1 (5730112174). but not able to replicate on 3.0.0 recent daily build.

3.0.0 or 2.92.0 seems fine. Change in functionality is only noticeable for 2.93.0 / 2.93.1.

Can reproduce on 2.93.1 (`5730112174`). but not able to replicate on 3.0.0 recent daily build. 3.0.0 or 2.92.0 seems fine. Change in functionality is only noticeable for 2.93.0 / 2.93.1.
Member

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

Changed status from 'Needs Triage' to: 'Confirmed'
Member

ok, I will try to find the good commit which fixes the issue (to backport the commit).

ok, I will try to find the good commit which fixes the issue (to backport the commit).
Member

Changed status from 'Confirmed' to: 'Resolved'

Changed status from 'Confirmed' to: 'Resolved'
Germano Cavalcante was assigned by Pratik Borhade 2021-08-10 21:12:56 +02:00
Member

Issue was fixed with the commit ea3895558d.

Added the commit in #88449 for backporting. Soon this will be again in working state with 2.93 daily builds. Closing the task. Thanks again for the report!

Issue was fixed with the commit ea3895558d. Added the commit in #88449 for backporting. Soon this will be again in working state with 2.93 daily builds. Closing the task. Thanks again for the report!
Thomas Dinges added this to the 2.93 LTS milestone 2023-02-07 18:46:13 +01:00
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Reference: blender/blender#89101
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