Array Modifier Alignment Error #75545

New Issue

Scott Haines · 2020-04-09T08:40:21+02:00

Scott Haines commented

2020-04-09 08:40:21 +02:00

System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce RTX 2080/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 441.66

Blender Version
Broken: version: 2.82 (sub 7), branch: master, commit date: 2020-03-12 05:06, hash: 375c7dc4ca
Worked: Not sure. Can't open file with older versions. It doesn't work in the latest experimental build.

Short description of error
I have set up an array that orbits a central pivot point. All of the instances in the array line up fine (or so it seems), but the very last instance doesn't line up with the first one. This has happened more than once in this project.

Exact steps for others to reproduce the error
Created a new UV Sphere
Duplicated once using array modifier, offset with rotated empty
Applied modifier and joined the two spheres with a bridge
Deleted extra vertices on opposing sides (of each sphere)
Created a new array modifier, 16 counts, to create a complete loop, offset with the same rotated empty.
Now we can see the error.

In the process of all of this, I applied scale, rotation.
I also checked that the 3D cursor was at 0 on X and Y, matching the original object Z height.

**System Information** Operating system: Windows-10-10.0.18362-SP0 64 Bits Graphics card: GeForce RTX 2080/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 441.66 **Blender Version** Broken: version: 2.82 (sub 7), branch: master, commit date: 2020-03-12 05:06, hash: `375c7dc4ca` Worked: Not sure. Can't open file with older versions. It doesn't work in the latest experimental build. **Short description of error** I have set up an array that orbits a central pivot point. All of the instances in the array line up fine (or so it seems), but the very last instance doesn't line up with the first one. This has happened more than once in this project. **Exact steps for others to reproduce the error** Created a new UV Sphere Duplicated once using array modifier, offset with rotated empty Applied modifier and joined the two spheres with a bridge Deleted extra vertices on opposing sides (of each sphere) Created a new array modifier, 16 counts, to create a complete loop, offset with the same rotated empty. Now we can see the error. In the process of all of this, I applied scale, rotation. I also checked that the 3D cursor was at 0 on X and Y, matching the original object Z height.

Scott Haines commented

2020-04-09 08:40:21 +02:00

Added subscriber: @scottiejhaines

Scott Haines commented

2020-04-09 08:51:01 +02:00

It may be worth noting that I can't seem to put in exact measurements in the original file. For example, I'll try to put in a number like 1" 250mil, but Blender changes it to something random like 1" 249.9997mil. I opened a new file to try and replicate the main problem, but so far, I can't. However, I can put in even numbers, like 1" 250mil, for example.

Philipp Oeser commented

2020-04-09 13:48:58 +02:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2020-04-09 13:48:58 +02:00

Changed status from 'Needs Triage' to: 'Needs User Info'

Philipp Oeser commented

2020-04-09 13:48:58 +02:00

Could you share your .blend file?
(this just makes sure we are all looking at the same thing...)

Could you share your .blend file? (this just makes sure we are all looking at the same thing...)

Scott Haines commented

2020-04-09 18:12:04 +02:00

Ball Bearings Blender Bug.blend

OK, I see what happened with the original upload. I uploaded a file, but I must have deleted the number in brackets, not knowing that was the file. I did notice that somehow the second sphere was a micro amount higher on the z-axis, even though I used the array modifier to get it there. However, after moving vertices, it didn't seem to make any difference. I went ahead and deleted all other objects in the file to make the file size smaller. I can upload the full file if needed.

[Ball Bearings Blender Bug.blend](https://archive.blender.org/developer/F8460106/Ball_Bearings_Blender_Bug.blend) OK, I see what happened with the original upload. I uploaded a file, but I must have deleted the number in brackets, not knowing that was the file. I did notice that somehow the second sphere was a micro amount higher on the z-axis, even though I used the array modifier to get it there. However, after moving vertices, it didn't seem to make any difference. I went ahead and deleted all other objects in the file to make the file size smaller. I can upload the full file if needed.

Scott Haines commented

2020-04-09 20:44:45 +02:00

After closer inspection, it does seem that each half-sphere seems to be slightly higher than it's counterpart, by fractions of a mil. The problem is that I can't seem to get the two to achieve the same z-location numbers. Blender refuses to allow exact numbers. Is this a problem when working with small numbers?

irex124 commented

2020-04-09 20:47:49 +02:00

Added subscriber: @Pasang

irex124 commented

2020-04-09 20:47:49 +02:00

Changed status from 'Needs User Info' to: 'Archived'

irex124 closed this issue

2020-04-09 20:47:49 +02:00

irex124 self-assigned this 2020-04-09 20:47:49 +02:00

irex124 commented

2020-04-09 20:47:49 +02:00

@scottiejhaines, your cursor is where it should be but the empty is not. Snap the empty to the cursor by Shift+S > Selection To Cursor and it will work. Feel free to comment if it doesn't work. Closing this report as there is no bug here.

@scottiejhaines, your cursor is where it should be but the empty is not. Snap the empty to the cursor by **Shift+S > Selection To Cursor** and it will work. Feel free to comment if it doesn't work. Closing this report as there is no bug here.

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Array Modifier Alignment Error #75545