I've got the same problem - using the LG interlaced 3d option in VPX. I can get it to look really good, but with the same issues as you described. Would be great to hear if anyone has solved this issue.
Well, solved not really. Actually there is a bug in VPX 10.8, that messes up perspective and other things in 3D interlaced mode. Do not spend time in setting up POV for 3D interlaced mode until the bug is fixed or you use the workaround below. Or you have to do it all again.
Kudos to jueank who found and described the bug. You can read more on GitHub: Incorrect display (scaling) of stereo 3D modes , Degraded / blurry image in stereo 3D modes and Combined X+YZ scaling changes aspect ratio
The only workaround currently is (I type this from memory, some things on your screen might be named slighly different):
1.) Load the table you want to play in VPX 10.8 GL Do not immediately start the table.
2.) Open video preferences and set 3D mode to any anaglyph mode. Yes anaglyph!
3.) Start the table.
4.) Press Q and go into Live Editor/Debug with the mouse
5.) Open video settings from the top menu
6.) Change 3D mode to 3D TV and interlaced or inverse interlace depending on your TV.
7.) Press ESC and choose Resume Game with your mouse.
Enter POV settings (F12) and press Launch button or Return on the keyboard to reset POV to default values. In case you've set up your monitor size, angle and player settings correctly in VPX video settings, your perspective is now almost perfect. Do slight adjustemnts and save POV.
Unfortunately you have to do steps 1 to 7 each time you play a table until the bug is fixed.
For a better workaround we need a hotkey and/or script to automate these steps. If anyone knows a way to switch from 3D anaglyph to 3D interlaced while a table is running with a hotkey or via a script, please post. I've looked into Nailbuster's Pinup Popper whether I could run a script that does this after a table is launched but I do not have enough knowledge in VPX and Popper to implement this.
Otherwise we can only hope the bug will be fixed soon and we can enjoy real 3D virtual pinball.
Edited by Pete248, 30 December 2023 - 07:11 PM.