Metaballs are not scaled properly on small values #64952

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Acrivec Cevirca · 2019-05-21T17:10:54+02:00

Acrivec Cevirca commented

2019-05-21 17:10:54 +02:00

System Information
Operating system: Windows-10-10.0.17763 64 Bits
Graphics card: GeForce GTX 980 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 425.31

Blender Version
Broken: version: 2.80 (sub 60), branch: master, commit date: 2019-04-30 10:55, hash: e8daa61570
Worked: (optional)

Short description of error
[Please fill out a short description of the error here]
Applying scale to small metaballs causes object to jump to big values on X axis.

Exact steps for others to reproduce the error
[Please describe the exact steps needed to reproduce the issue]
[Based on the default startup or an attached .blend file (as simple as possible)]
I want to create metaball-man made of bubbles. Bubbles have about 5-10 centimeters, so I want to scale my metaball and then apply scale so my textures are applied correctly instead of being shrinked down.
But I can't make metaball to shrink in X dimension. It stays very large. Y and Z scales properly.

With the attached .blend just apply scale and see how it jumps to big size.
metaballs.blend

**System Information** Operating system: Windows-10-10.0.17763 64 Bits Graphics card: GeForce GTX 980 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 425.31 **Blender Version** Broken: version: 2.80 (sub 60), branch: master, commit date: 2019-04-30 10:55, hash: `e8daa61570` Worked: (optional) **Short description of error** [Please fill out a short description of the error here] Applying scale to small metaballs causes object to jump to big values on X axis. **Exact steps for others to reproduce the error** [Please describe the exact steps needed to reproduce the issue] [Based on the default startup or an attached .blend file (as simple as possible)] I want to create metaball-man made of bubbles. Bubbles have about 5-10 centimeters, so I want to scale my metaball and then apply scale so my textures are applied correctly instead of being shrinked down. But I can't make metaball to shrink in X dimension. It stays very large. Y and Z scales properly. With the attached .blend just apply scale and see how it jumps to big size. [metaballs.blend](https://archive.blender.org/developer/F7057628/metaballs.blend) ![YBgaDtk- [x].png](https://archive.blender.org/developer/F7057646/YBgaDtk_1_.png) ![SnKFSm5- [x].png](https://archive.blender.org/developer/F7057649/SnKFSm5_1_.png) ![P1VFtaO- [x].png](https://archive.blender.org/developer/F7057653/P1VFtaO_1_.png)

Acrivec Cevirca commented

2019-05-21 17:10:54 +02:00

Added subscriber: @Acrivec

Eitan Traurig commented

2019-06-06 13:15:46 +02:00

Added subscriber: @EitanSomething

Eitan Traurig commented

2019-06-06 13:15:46 +02:00

I don't have a problem scaling the cylinder on the x axis.Can you try on the latest build.If it is still a bug can you share a video bug because I might being doing the scaling in a different way than you.

Acrivec Cevirca commented

2019-06-06 14:45:44 +02:00

@EitanSomething pardon that grabbing but I've spend last couple of weeks in Unreal Engine ;p
2019-06-06_14-43-14.webm

@EitanSomething pardon that grabbing but I've spend last couple of weeks in Unreal Engine ;p [2019-06-06_14-43-14.webm](https://archive.blender.org/developer/F7090039/2019-06-06_14-43-14.webm)

Eitan Traurig commented

2019-06-06 15:21:22 +02:00

What button are you pressing to get the Apply menu. When I right click I get the Object Context Menu

Acrivec Cevirca commented

2019-06-06 15:58:55 +02:00

@EitanSomething shift+a, eventually spacebar search menu->apply

Sebastian Parborg commented

2019-06-12 15:54:40 +02:00

Added subscriber: @ZedDB

Sebastian Parborg self-assigned this 2019-06-12 15:54:40 +02:00

Sebastian Parborg commented

2019-06-12 15:54:40 +02:00

It seems like scaling is not applied correctly unless the scale is uniform.

Sebastian Parborg was unassigned by Dalai Felinto

2019-12-23 16:34:18 +01:00

Jeroen Bakker commented

2020-01-21 11:37:13 +01:00

Added subscriber: @Jeroen-Bakker

Jeroen Bakker commented

2020-01-21 11:37:13 +01:00

Changed status from 'Confirmed' to: 'Archived'

Jeroen Bakker closed this issue

2020-01-21 11:37:13 +01:00

Jeroen Bakker self-assigned this 2020-01-21 11:37:13 +01:00

Jeroen Bakker commented

2020-01-21 11:37:13 +01:00

Not sure what you expect. Applying non uniform scaling to meta balls would always leave artifacts. The actual base form is a pill and transformed to a cylinder. When applying the transform the pill will appear again. Note2: a pill only has a single size, so can only apply a single axis so it is more which one. Also I am not sure about the usecase for applying scaling during meta ball editing. Best to convert to mesh and continue from there with regular modeling.

Anyhow, mark this report as Invalid as it works as intended.

Not sure what you expect. Applying non uniform scaling to meta balls would always leave artifacts. The actual base form is a pill and transformed to a cylinder. When applying the transform the pill will appear again. Note2: a pill only has a single size, so can only apply a single axis so it is more which one. Also I am not sure about the usecase for applying scaling during meta ball editing. Best to convert to mesh and continue from there with regular modeling. Anyhow, mark this report as Invalid as it works as intended.

Acrivec Cevirca commented

2020-01-21 11:44:28 +01:00

I do not agree. It is clearly not working as expected.
you tell me to convert it to mesh... I'm using metaballs for a reason.

I love to report blender bugs. It feels so pointless to do it.

But I know it's already lost because you've said so, and there's no point of arguing. You can close it.

Guess the only fix will be to use other unit scale and scale make it as I want without going for small scale values, which does not cause this bug to appear. Hope unit scale does not screw thin film interference.

I do not agree. It is clearly not working as expected. you tell me to convert it to mesh... I'm using metaballs for a reason. I love to report blender bugs. It feels so pointless to do it. But I know it's already lost because you've said so, and there's no point of arguing. You can close it. Guess the only fix will be to use other unit scale and scale make it as I want without going for small scale values, which does not cause this bug to appear. Hope unit scale does not screw thin film interference.

ronan ducluzeau commented

2020-01-21 12:09:30 +01:00

Added subscriber: @zeauro

ronan ducluzeau commented

2020-01-21 12:09:30 +01:00

When you enter into Edit mode, capsule shape is defined by an internal Size X setting.
When you apply Scale to this object, you are transferring modification from object mode to this value.
So, resulting capsule length is longer or shorter.
But by doing that, you remove scaling done on meshing of tips of capsule.
And tips are becoming rounder as hemispheres because that is only shape, Blender allows them to have.

No developer never created settings to control aspect of tips of capsule for Blender metaballs.
So, it is a limitation of design of metaballs in Blender. It is not something that was ever supported.

If you want to have flat tips, you have to combine this metaball primitive with other ones.
For example, by adding negative planes or cubes at tips of capsule, you can obtain a similar shape.

When you enter into Edit mode, capsule shape is defined by an internal Size X setting. When you apply Scale to this object, you are transferring modification from object mode to this value. So, resulting capsule length is longer or shorter. But by doing that, you remove scaling done on meshing of tips of capsule. And tips are becoming rounder as hemispheres because that is only shape, Blender allows them to have. No developer never created settings to control aspect of tips of capsule for Blender metaballs. So, it is a limitation of design of metaballs in Blender. It is not something that was ever supported. If you want to have flat tips, you have to combine this metaball primitive with other ones. For example, by adding negative planes or cubes at tips of capsule, you can obtain a similar shape.

Acrivec Cevirca commented

2020-01-21 15:59:10 +01:00

Man, this report is about metaball changing it's dimensions on it's own, not about the flat caps. Sigh.

Eitan Traurig commented

2020-01-21 16:00:49 +01:00

Removed subscriber: @EitanSomething

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Metaballs are not scaled properly on small values #64952