VSE placement of some elements is off by 1 px #90785

New Issue

tt · 2021-08-19T23:37:20+02:00

tt commented

2021-08-19 23:37:20 +02:00

System Information
Operating system: Linux-5.4.0-81-generic-x86_64-with-glibc2.31 64 Bits
Graphics card: GeForce GTX 1070 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 460.91.03

Blender Version
Broken: version: 3.0.0 Alpha, branch: master, commit date: 2021-08-18 20:22, hash: a217e043be
Worked: (newest version of Blender that worked as expected)

Short description of error
blender vse placement bug.blend

place some elements smaller than the video canvas in vse by pixel and there will be errors. probably because the elements are smaller than full size.

Exact steps for others to reproduce the error
attached file:
vse canvas size: 1000x1000px
added 500x500px image and placed it on -250;250
duplicated the image to have 4 of them and tried to fill the whole canvas with the images by pixel perfect placement.
on my machine there are gaps appearing between the elements on the bottom right one, maybe there are different gaps on different machines, I had different gaps than these before.
even setting it to 249 on one axis does not solve this but introduces unwanted gaps at the bottom. and it seems there are gaps between the bottom left image and the canvas bottom too.

my idea for a solution would be to start placing elements from to top left or bottom left and not from the center as the 0 in the center makes it weird and unintuitive, a 0 on x and y in a corner makes this a bit easier. That would lead to the need of anchor points on elements I think, elements should have an anchor on a corner (top left or the same as the canvas zero point as default) to make placing them also easier, switching corner for the anchor point could be an option as well as setting a value for the anchor point could be an option. rotation could also have the option to switch between center and anchor point rotation, same for scaling.
AND anchor points would make it probably easier to implement object snapping, that would be really useful but has nothing to do with this bug report :)

**System Information** Operating system: Linux-5.4.0-81-generic-x86_64-with-glibc2.31 64 Bits Graphics card: GeForce GTX 1070 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 460.91.03 **Blender Version** Broken: version: 3.0.0 Alpha, branch: master, commit date: 2021-08-18 20:22, hash: `a217e043be` Worked: (newest version of Blender that worked as expected) **Short description of error** [blender vse placement bug.blend](https://archive.blender.org/developer/F10294608/blender_vse_placement_bug.blend) ![bug.jpg](https://archive.blender.org/developer/F10294614/bug.jpg) place some elements smaller than the video canvas in vse by pixel and there will be errors. probably because the elements are smaller than full size. **Exact steps for others to reproduce the error** attached file: vse canvas size: 1000x1000px added 500x500px image and placed it on -250;250 duplicated the image to have 4 of them and tried to fill the whole canvas with the images by pixel perfect placement. on my machine there are gaps appearing between the elements on the bottom right one, maybe there are different gaps on different machines, I had different gaps than these before. even setting it to 249 on one axis does not solve this but introduces unwanted gaps at the bottom. and it seems there are gaps between the bottom left image and the canvas bottom too. my idea for a solution would be to start placing elements from to top left or bottom left and not from the center as the 0 in the center makes it weird and unintuitive, a 0 on x and y in a corner makes this a bit easier. That would lead to the need of anchor points on elements I think, elements should have an anchor on a corner (top left or the same as the canvas zero point as default) to make placing them also easier, switching corner for the anchor point could be an option as well as setting a value for the anchor point could be an option. rotation could also have the option to switch between center and anchor point rotation, same for scaling. AND anchor points would make it probably easier to implement object snapping, that would be really useful but has nothing to do with this bug report :)

blender-admin commented

2021-08-19 23:37:20 +02:00

#88838 was marked as duplicate of this issue

tt commented

2021-08-19 23:37:21 +02:00

Added subscriber: @ToxicTuba

Philipp Oeser commented

2021-08-20 08:58:54 +02:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2021-08-20 08:58:54 +02:00

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

Philipp Oeser commented

2021-08-20 08:58:54 +02:00

There was this report as well #88838 (VSE editor is 1 pixel off when aligning non-frame images) which I could not reproduce, but this one I can.

Philipp Oeser commented

2021-08-20 08:59:42 +02:00

Added subscriber: @GH-7

Matteo GH commented

2021-08-20 12:50:23 +02:00

I'd like to add that Blender 2.92 did NOT have this problem. It started with 2.93.

Richard Antalik commented

2021-11-05 12:01:59 +01:00

Added subscriber: @iss

Richard Antalik commented

2021-11-05 12:01:59 +01:00

I think I have solved it, but the solution may cause problems I am not aware of. But cropping seems to work correctly. Would be good to do tests with some method to verify precision.

I will make patch build - more eyes on this the better, so feel free to check too. I did very quick test only so hopefully it's not too bad and I won't waste anybody's time...
Build will be (in few hours) on https://builder.blender.org/download/patch/

I think I have solved it, but the solution may cause problems I am not aware of. But cropping seems to work correctly. Would be good to do tests with some method to verify precision. I will make patch build - more eyes on this the better, so feel free to check too. I did very quick test only so hopefully it's not too bad and I won't waste anybody's time... Build will be (in few hours) on https://builder.blender.org/download/patch/

David Thomas commented

2022-07-24 16:28:44 +02:00

Added subscriber: @bagospanners

Richard Antalik added this to the Video Sequencer project 2023-02-09 21:18:58 +01:00

Philipp Oeser removed the

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VSE placement of some elements is off by 1 px #90785