Interlaced 3D Viewport swaps eyes when creating new window #84301

New Issue

Jeff Boller · 2021-01-01T05:49:29+01:00

Jeff Boller commented

2021-01-01 05:49:29 +01:00

System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: Quadro P1000/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 452.56

Blender Version
Broken: version: 2.91.0, branch: master, commit date: 2020-11-25 08:34, hash: 0f45cab862
Worked: (newest version of Blender that worked as expected)

Short description of error
I am using a Zalman Trimon passive 3D monitor which uses Blender's interlaced 3D mode to display stereoscopic 3D. Everything works well in the 3D Viewport until I either create a new window or resize a nearby window. The original 3D Viewport pane suddenly swaps the left and right eyes and never goes back to the original configuration. It appears that dragging an adjacent window triggers the 3D Viewport to be vertically offset by one line, which causes the left eye image to become the right eye image and vice versa.

See this video for a demonstration (use the password "blender" without quotes): https://dai.ly/x7yf3cg

Exact steps for others to reproduce the error

Open the default Blender file.
In the Properties editor, go to the Output Properties tab, check Stereoscopy and make sure Stereo 3D is picked as the option.
Go to Window -> Set Stereo 3D.
Set Display Mode to Interlace. Leave Interlace Type set to Row Interleaved. Leave Swap Left/Right unchecked.
Look at any object in the 3D Viewport through a 3D monitor that can interpret interlaced rows. Take note if the object is in positive parallax (the object is deep within the screen) or if the object is in negative parallax (the object is sticking out of the screen).
Create a new 3D Viewport pane by dragging the lower right hand corner of the current 3D Viewport up.
Note that the original 3D Viewport pane has swapped the left and right eyes (i.e. if the object was in positive parallax, it's now in negative parallax and vice versa), but the 3D Viewport pane you just created has the expected views for the left and right eyes.

swapped_eyes.blend

**System Information** Operating system: Windows-10-10.0.19041-SP0 64 Bits Graphics card: Quadro [P1000](https://archive.blender.org/developer/P1000.txt)/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 452.56 **Blender Version** Broken: version: 2.91.0, branch: master, commit date: 2020-11-25 08:34, hash: `0f45cab862` Worked: (newest version of Blender that worked as expected) **Short description of error** I am using a Zalman Trimon passive 3D monitor which uses Blender's interlaced 3D mode to display stereoscopic 3D. Everything works well in the 3D Viewport until I either create a new window or resize a nearby window. The original 3D Viewport pane suddenly swaps the left and right eyes and never goes back to the original configuration. It appears that dragging an adjacent window triggers the 3D Viewport to be vertically offset by one line, which causes the left eye image to become the right eye image and vice versa. See this video for a demonstration (use the password "blender" without quotes): https://dai.ly/x7yf3cg **Exact steps for others to reproduce the error** - Open the default Blender file. - In the Properties editor, go to the Output Properties tab, check Stereoscopy and make sure Stereo 3D is picked as the option. - Go to Window -> Set Stereo 3D. - Set Display Mode to Interlace. Leave Interlace Type set to Row Interleaved. Leave Swap Left/Right unchecked. - Look at any object in the 3D Viewport through a 3D monitor that can interpret interlaced rows. Take note if the object is in positive parallax (the object is deep within the screen) or if the object is in negative parallax (the object is sticking out of the screen). - Create a new 3D Viewport pane by dragging the lower right hand corner of the current 3D Viewport up. - Note that the original 3D Viewport pane has swapped the left and right eyes (i.e. if the object was in positive parallax, it's now in negative parallax and vice versa), but the 3D Viewport pane you just created has the expected views for the left and right eyes. [swapped_eyes.blend](https://archive.blender.org/developer/F9545807/swapped_eyes.blend)

Jeff Boller commented

2021-01-01 05:49:29 +01:00

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