Cell Fracture Add-On Automatically Decimates Base Mesh #85487

New Issue

Keith Slagerman · 2021-02-09T08:57:04+01:00

Keith Slagerman commented

2021-02-09 08:57:04 +01:00

System Information
Operating system: Windows 10 Home 64-bit (2004)
Graphics card: GeForce GTX 1660 SUPER/PCIe/SSE2
version: '4.5.0 NVIDIA 460.89'

Blender Version
Broken: Version: 2.91.0, branch: master, commit date: 2020-11-25 08:34, hash: 0f45cab862b8, type: Release
Worked: ...

Addon Information
Name: Cell Fracture (0, 2)
Author: ideasman42, phymec, Sergey Sharybin

Short description of error
Running the Cell Fracture add-on on high-polygon triangulated or quad base mesh (such as 3D scanned model) results in fractured objects that are highly decimated/reduced as compared to the original base mesh they were born from.
Before Fracture

After Fracture

Exact steps for others to reproduce the error

Import high-poly STL or OBJ to Blender
Create simple particle system for object with particle source set to Volume.
Run Cell Fracture add-on from Object Menu>Quick Effects>Cell Fracture with default settings
Resulting fractured objects are highly decimated. If the object being fractured consists of all quads, it will be automatically triangulated and decimated to a lower-poly version of the original mesh. If the object is already triangulated, it will be decimated.

Additional Info:
It seems that at least one previous version of the Cell Fracture add-on had a "[Simplify Base Mesh ]]" option that has disappeared from the current version of Blender. This option is also referenced on the add-on's [ https:*blender-addons.org/cell-fracture-addon/ | description page .

It would be beneficial to be able to utilize this add-on and maintain the original topology of the base mesh in the fractured objects.

Wondering if anyone here can offer some advice on the Cell Fracture add-on.

I am trying to fracture some very high-poly triangulated 3D scans but it seems that the Cell Fracture add-on takes it upon itself to simplify the base mesh on it's own and the resulting fractured objects are very low res.

I looked into this and I see that about 2 years ago, the bundled Cell Fracture add-on had a lot more options than what are available now in 2.91. Specially, it appears that there was once a 'Simplify Base Mesh' option in the Cell Fracture setup (along with numerous other options) but they are no longer present in the add-on.

Even though it would appear that the 'Simplify Base Mesh" option has been removed, is it plausible that the add-on is applying this feature during the fracture process?

I would like to avoid Cell Fracture from simplifying my mesh. I am also curious about why the current version of Cell Fracture has fewer options available than it appears to have in previous versions.

**System Information** Operating system: Windows 10 Home 64-bit (2004) Graphics card: GeForce GTX 1660 SUPER/PCIe/SSE2 version: '4.5.0 NVIDIA 460.89' **Blender Version** Broken: Version: 2.91.0, branch: master, commit date: 2020-11-25 08:34, hash: 0f45cab862b8, type: Release Worked: ... **Addon Information** Name: Cell Fracture (0, 2) Author: ideasman42, phymec, Sergey Sharybin **Short description of error** Running the Cell Fracture add-on on high-polygon triangulated or quad base mesh (such as 3D scanned model) results in fractured objects that are highly decimated/reduced as compared to the original base mesh they were born from. Before Fracture ![Screenshot 2021-02-09 000102.png](https://archive.blender.org/developer/F9744410/Screenshot_2021-02-09_000102.png) After Fracture ![Screenshot 2021-02-09 000055.png](https://archive.blender.org/developer/F9744411/Screenshot_2021-02-09_000055.png) **Exact steps for others to reproduce the error** 1. Import high-poly STL or OBJ to Blender 2. Create simple particle system for object with particle source set to Volume. 3. Run Cell Fracture add-on from Object Menu>Quick Effects>Cell Fracture with default settings 4. Resulting fractured objects are highly decimated. If the object being fractured consists of all quads, it will be automatically triangulated and decimated to a lower-poly version of the original mesh. If the object is already triangulated, it will be decimated. --- **Additional Info:** It seems that at least one previous version of the Cell Fracture add-on had a "[Simplify Base Mesh ]]" option that has disappeared from the current version of Blender. This option is also referenced on the add-on's [[ https:*blender-addons.org/cell-fracture-addon/ | description page ](https:*developer.blender.org/T61901). It would be beneficial to be able to utilize this add-on and maintain the original topology of the base mesh in the fractured objects. --- Wondering if anyone here can offer some advice on the Cell Fracture add-on. I am trying to fracture some very high-poly triangulated 3D scans but it seems that the Cell Fracture add-on takes it upon itself to simplify the base mesh on it's own and the resulting fractured objects are very low res. I looked into this and I see that about 2 years ago, the bundled Cell Fracture add-on had a lot more options than what are available now in 2.91. Specially, it appears that there was once a 'Simplify Base Mesh' option in the Cell Fracture setup (along with numerous other options) but they are no longer present in the add-on. Even though it would appear that the 'Simplify Base Mesh" option has been removed, is it plausible that the add-on is applying this feature during the fracture process? I would like to avoid Cell Fracture from simplifying my mesh. I am also curious about why the current version of Cell Fracture has fewer options available than it appears to have in previous versions.

Keith Slagerman commented

2021-02-09 08:57:04 +01:00

Added subscriber: @kslaggs

Keith Slagerman commented

2021-02-09 09:02:49 +01:00

Providing screen shots of before / after Cell Fracturing a high-poly mesh.

Before Fracture

After Fracture

Providing screen shots of before / after Cell Fracturing a high-poly mesh. Before Fracture ![Screenshot 2021-02-09 000102.png](https://archive.blender.org/developer/F9744410/Screenshot_2021-02-09_000102.png) After Fracture ![Screenshot 2021-02-09 000055.png](https://archive.blender.org/developer/F9744411/Screenshot_2021-02-09_000055.png)

Germano Cavalcante commented

2021-02-10 21:20:26 +01:00

Added subscriber: @mano-wii

Germano Cavalcante commented

2021-02-10 21:20:26 +01:00

I can't reproduce the problem:

I can't reproduce the problem: ![image.png](https://archive.blender.org/developer/F9773981/image.png)

Philipp Oeser commented

2021-02-17 16:40:58 +01:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2021-02-17 16:40:58 +01:00

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

Philipp Oeser commented

2021-02-17 16:40:58 +01:00

Not sure if we are talking about

Cell Fracture / object_fracture_cell
Cell Fracture Crack It / object_fracture_crack

These are two different Addons.
There has been some back and forth in regards to merging them:
blender/blender-addons-contrib@f00d4fbe84.
blender/blender-addons-contrib@1857eaff30

So just to make sure: doe you have both installed?
Crack It has this Simplify Base Mesh option, so maybe something gets mixed up here?

Not sure if we are talking about - `Cell Fracture` / `object_fracture_cell` - `Cell Fracture Crack It` / `object_fracture_crack` These are two different Addons. There has been some back and forth in regards to merging them: blender/blender-addons-contrib@f00d4fbe84. blender/blender-addons-contrib@1857eaff30 So just to make sure: doe you have both installed? Crack It has this `Simplify Base Mesh` option, so maybe something gets mixed up here?

Keith Slagerman commented

2021-02-18 18:12:02 +01:00

Cell Fracture / object_fracture_cell

Cell Fracture / object_fracture_cell ![image.png](https://archive.blender.org/developer/F9815103/image.png)

Philipp Oeser commented

2021-02-18 18:34:53 +01:00

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

Omar Emara commented

2022-03-11 16:50:40 +01:00

Added subscriber: @OmarEmaraDev

Omar Emara commented

2022-03-11 16:50:40 +01:00

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

Omar Emara commented

2022-03-11 16:50:40 +01:00

I can't replicate this either.
Dos this happen on all objects you tried or just this one? Can you share the STL mesh you used?

I can't replicate this either. Dos this happen on all objects you tried or just this one? Can you share the STL mesh you used?

Philipp Oeser commented

2022-04-05 10:22:00 +02:00

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

Philipp Oeser closed this issue

2022-04-05 10:22:00 +02:00

Philipp Oeser commented

2022-04-05 10:22:00 +02:00

No activity for more than a week. As per the tracker policy we assume the issue is gone and can be closed.

Thanks again for the report. If the problem persists please open a new report with the required information.

No activity for more than a week. As per the tracker policy we assume the issue is gone and can be closed. Thanks again for the report. If the problem persists please open a new report with the required information.

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