Questions tagged [add-on]

An add-on is a python script or plugin created to expand Blender's functionality. There are many add-ons in the official builds of Blender, and with every new version comes new add-ons.

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Problem with camera_viewport_addin (view_matrix, perspective_matrix)

I have some problem with camera_viewport_addin.py I need some tool to replicate some design. I have just pictures with some angles how was done this all, but it's hard to explain all situation and ...
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20 views

Reset add-on preferences

I'm surprised I wasn't able to find the answer to this one. Is there a way to restore a specific add-on's preference states to defaults? I would prefer not to uninstall it if possible. Thanks!
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Blender Python: Fixed size list of elements?

I need 4 instances of a property group sub-class in my primary class, and I want to access them (main.sub[*].x) based on an enum or index. Here's a fictitious (and ...
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Blender Dev: Loop() or Selection Event?

Is it possible to detect changes in object and collection selections or activations (bpy.context.object/collection)? I'm most interested in detecting changes in the ...
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How to check if mouse is in View3D Window from modal operator (2.80)

In the context of a modal operator, I would like to perform an operation when the left mouse button is clicked in the VIEW_3D area, ...
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How can i append a material from a blend file using python script

I wan't a script that could append a particular material only from a particular blend file so that i can just run the script and the material is there
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30 views

Appending a sub-menu under an existing sub-menu in Blender 2.8

I can add menus to Blender 2.8 with the python code below but how can I add a sub-menu using python to one of Blenders existing menus? I'm trying to add the rtMyMenu sub-menu under Blenders Add-Curve ...
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What causes an “input/output error” when trying to install an add-on from a .zip file?

I've obtained the .zip for writing output in a format suitable for BabylonJS. It doesn't install. I see a popup saying there's an input/output error. I'm using the the recent 2.80.
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62 views

How to change a *VectorProperty size?

Let's say I've created a scene property named a: ...
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25 views

Blender Python: Property Description String Limit?

Is there a string length limit for the descriptions of properties? I assume there is. Does anyone know what that length is, and is there a safety mechanism to catch strings that are too long? ...
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Blender Python: Generate custom property (due to error bpy_struct[key]: key “PropertyName” not found)?

Is there a way to force Blender to generate a custom property ahead of time? It looks like custom properties added to objects are only generated when the user changes them from the default in the UI, ...
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Blender Python: Convert Enum Flags into String?

It seems difficult to find any information about enum-flag usage and workflow. I'm familiar with bitflags and related operations, but the blender/python specifics are fun to figure out. Is there any ...
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Import/export JSON add-on in 2.8?

Ok there are multiple JSON addons for 2.79 and they work, but I need an add-on for 2.8. Are there any currently for import/export JSON?
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property get/set example does not work [duplicate]

I would like to be able to adjust a property of an object in my addon. In particular, the min value of one property needs to depend on the value of another property. How should this be accomplished? ...
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Converting old python script to work in Blender 2.80 [duplicate]

I'm trying to convert a python script to work in Blender 2.8 https://github.com/mtyka/attractor/blob/c7edbadcee826ea5d791529cfa329f2c326215ec/attractor.py I've made the changes to line 27 to say "...
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3answers
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Blender Python: Call operator function from another function?

Sorry guys, I know I'm asking a lot of questions. I really am trying to find these before I ask. After searching, it looks like the best way to report a user-error to the user is by using self.report(...
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Blender Python: Output Paragraph of Text?

Is there any built-in support for automatic line breaks when writing text to the UI, such as through the layout.label() function? For example, if I set text that ...
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32 views

Blender Dev: Hide Custom Properties?

I was wondering if there is a way to hide custom properties we add to objects in our add-ons - to keep them from being displayed on the side (N) panel: Some type of "internal only" option? As an ...
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1answer
38 views

Blender Python: Custom Enum Flags

I've been trying to set up some custom enum flags. In my situation, there are two variables that I want to share the same enum type setup. So I would like the flags to be interchangeable between them. ...
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19 views

Blender Python: Return multiple values? And variables vs references

I come from C++ where I really abused the use of references in function parameters. Example: ...
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29 views

Scatter without overlapping instances

I am looking for something like neatscatter https://neatscatter.com/ Is something like this possible in blender? Thx
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Blender Python: Selections and Context

I'm trying to understand how selections and active objects work within a context. I thought I understood that a selection is part of a context. I read somewhere that you can create a copy of a ...
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1answer
10 views

Addons don't install

I've installed addons before, but recently when I upload the addon into blender, and I search for the addon, nothing shows. I'm not unzipping the file, so I'm not sure what's wrong? In the bottom ...
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Blender Python: Detect New Scene?

Very simple question from a very new add-on developer. How would one go about detecting when a scene is started fresh or loaded from file? For example, if you have some add-on preference variable ...
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1answer
40 views

Export File Dialog in Blender 2.80

How can I get bring up a popup file browser in Blender 2.80 invoked by a button click in my addon, to define the name and location of a file to be exported? In Blender 2.7x, I did this via the ...
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2answers
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Combine and duplicate meshes before exporting them?

I'm writing an add-on that exports objects to FBX file format. One of its features will be the ability to merge another object for export. So the user selects object ...
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1answer
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Where can i find an “operator presets” addon-template?

I just heard that there is a way to make presets and let users creat and manage their own operator presets within the addon. Where can i find such a template ? i read this article but it's not ...
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2answers
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How to install 'Cycle Cameras' addon for 2.8x?

I'm using a great addon called "Cycle Cameras" made by @CoDEmanX for Blender 2.79b which I'd like to use in Blender 2.8x as well. Fortunately there already is an updated version by @Matthias & @...
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31 views

How to store a PropertyGroup in addon_prefs?

i made some research about propertygroups. it could be really useful if the data of thoses propertygroups are saved within my addon pref and not reset between each blender session. How am i supposed ...
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Detecting active changes?

I'm working on an add-on that stores similar information inside both collections and objects. I'm wanting to show information that relates to one of these elements at a time (either a collection or an ...
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Manage a lot of addon_pref settings efficiently?

i try to save a lot of user stored data inside of the addon pref and i would like to have something like that. ...
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Denied access to blender add-on

I am learning how to create an add-on for Blender, by watching this tutorial: https://www.youtube.com/watch?v=uahfuypQQ04 But when I try to run it with blender I have this message: "Access denied:...
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Blender 2.80 to Blackmagic Fusion

What is the best way to export camera animation from Blender 2.80 to Blackmagic Fusion. There is a script addon published on BlenderArtists which is perfect however it has not been updated for Blender ...
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I cannot access addon_pref from a class?

For some reasons i cannot access my addon_prefs storage from an enumproperty class? ...
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1answer
32 views

Identify root collection?

I'm not sure if this type of question belongs here, but I'm trying to write a simple add-on that exports game assets to FBX files based on collections. Each collection becomes a separate file. But an ...
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How to store/access a lot of preferences easely?

I make a lot of addons that use addon_pref settings for customization storage. For example i let the user create 20 custom slots settings and inside thoses are a lot of parameters. I'd like to have ...
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25 views

is there any method to quickly draw a shortest distance path on a mesh from one point to the other?

shortest distance problem Any addon to achieve this? Thanks a lot. screenshot: https://app.yinxiang.com/fx/f2ccf92a-7079-4fe3-b6f0-cda289efcd0f
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Activating add-on not working (blender 2.8 [duplicate]

I'm having trouble installing the cubesurfer blender addon. I installed the zip using the method I usually use, but it didn't work. When I tried to check the addon to turn it on, I got two traceback ...
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Can't install Blendercam it says Blender stopped working

I've followed all the steps from the video and nothing works
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Add-on list not showing up

I really have no idea what is going on with this. I’ve been using Blender since 2013 so I am pretty well used to the interface. Please give helpful answers if you have any. Basically I opened the ...
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20 views

Is there a way to make particles act like rigid bodies

From what I know there was an add-on that that allowed this but that add-on is support was stopped in blender 2.77 Here is the add-ons website
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Failure enabling Radeon ProRender in Blender 2.80 on Ubuntu 18.04

[Edit: It is suspected that the failure is caused by the fact that the .run file is built for ubuntu 16 but the actual os is ubuntu 18. However the version built for ubuntu 18.04 cannot be found ...
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2answers
68 views

Is there a molecular addon for 2.8?

I've installed the molecular addon in 2.8 release but the options are no where to be found, wondering if there's a 2.8 supported version somewhere or if i need to get 2.79 to use it
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14 views

Sculpting Brush Strength Falloff via Distance?

General question: Sculpting Brush Strength Falloff via Distance, is that a thing? maybe an addon? Considerations for such would be: Distance from "Focus point" to the "view-port camera" position. ...
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Is there an addon for touch input?

My math teacher is interested in using Blender in class to help with visual learning. Is there an extension out there that makes Blender usable with only a touchscreen? We have a Promethean in class, ...
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Small seam lines visible with Cell Fracture addon

Whenever I use the Cell Fracture Addon on anything, I always see these tiny seam lines inbetween the shards of what I fractured. I haven't found any way to fix it. Please help]1
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1answer
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Can't Find any of the add-ons on “Testing” for 2.8

I'm trying to find the import-export after effects add-on; the youtube tutorial I was watching said I should find it in the "Testing" section of the "add-on" menu. But Nothing shows up on my "Testing" ...
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Clothing and Hair for MB-Lab addon

I'm new to Blender and 3d in general, and I'm working on npr for a graphic novel. I'm trying to see if I can use the figures from MB-Lab for most of the characters, but there is not much clothing or ...
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15 views

How to write my add-on so that when installed it also installs dependencies (let's say: scipy or numpy-quaternion)?

How to write my add-on so that when installed it also installs dependencies (let's say: scipy or numpy-quaternion)? Does blender understand setuptools (setup.py)? Thanks, Note: I'm using blender 2....
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2answers
62 views

How to sort Shape keys by “a to z” in blender 2.8?

In 2.79,we could sort them by "a to z".But in 2.8, the function has disappeared. Is there any addons or python scripts?