Questions tagged [development]

For coding questions about Blender development, including addon or script development with the Python API. Does not include general programming questions, non blender specific tasks or errors, nor compilation of Blender binaries.

Filter by
Sorted by
Tagged with
0
votes
0answers
8 views

Set Raycast hit location as translate value when extruding region? [closed]

I have been looking for ways to set the translation value in edit mode to the hit location vector of a Raycast. But for some reason it offsets elsewhere. Is this because the values are different?
0
votes
3answers
33 views

Looking for Blender source code of version 2.79.7

Where can I find the source code, corresponding to this exact build 2.79.7 blender-2.79 e045fe53f1b0 ? - https://download.blender.org/release/Blender2.79/latest/
0
votes
1answer
23 views

Accessing Blender's DNA Mesh struct via as_pointer()

How can I access the actual structure of a Mesh datablock in memory using the value returned from bpy.types.Mesh.as_pointer() In 2.79 Blender there used to be a possibility to do that by just passing ...
0
votes
0answers
14 views
1
vote
1answer
16 views

context.material.node_tree - context has no attribute to material?

I am trying to write an addon, I am making a node group that will be created with a single button however I have run into issues with these final lines: ...
-1
votes
0answers
25 views

UI Components and Layout Gallery (or Template)

I'm interested to know if there is a "goto" source/gallery to see all of the Blender (python) UI components/panels. Something like, https://getuikit.com/docs/progress. It would also be helpful to ...
2
votes
1answer
26 views

Query if modifier exists on listed objects [duplicate]

I'm new to Blender and the way it works with Python, so I still don't understand quite well the way the different commands work. But I wanna create a small tool where i can assign a modifier to a ...
1
vote
0answers
13 views

How to remove the upper tabs from the UI?(i.e Layout, Modeling, Sculpting etc.)

I want to streamline the UI of Blender from the source, so I was wondering where I could find the code concerning those tabs because all of them are very overwhelming and I would prefer to either ...
0
votes
2answers
59 views

How do I add an .obj file from a relative file location?

I need help adding an .obj file via scripting. I've tried using this line of code, but I'm having issues importing the obj file: ...
0
votes
0answers
12 views

How to Test OptiX with GTX 16 Series?

so, i see this https://developer.blender.org/rB58ea0d93f193adf84162d736c3c69500584e1aef#change-e67uUgRJWMjZ . and then how to implement it to our blender?
1
vote
0answers
32 views

How do you go about solving a bug in Blender: language selector in python console

For example, based on: Purpose of the languages selector in the Python Console I am familiar with git and reporting a bug. But my question is: How do you go about solving such a bug? Blender uses C/...
0
votes
0answers
15 views

How to select the layer above and below the current layer on Grease Pencil?

Does this feature in Photoshop exist in Blender's Grease Pencil? Also, could you develop an add-on for this feature?
1
vote
0answers
30 views

Where is the core code that makes up Blender's ShapeKey? [closed]

I'm looking for the core C / C ++ code that makes up Blender's ShapeKey. I'm looking for Blender standard features, not add-ons. I know Blender is open source, but I'm an amateur about Blender. ...
1
vote
0answers
36 views

Equivalent of mesh.tessfaces.add, foreach_set in 2.8

I have the following code in an addon: ...
0
votes
0answers
30 views

Why do Blender objects have one ShapeKey each?

I am using Maya and Maya has BlendShape. Maya's BlendShape is almost the same as Blender's ShapeKey. And, Maya's BlendShape can transform multiple objects with one node. However, Blender's ShapeKey ...
0
votes
0answers
16 views

How to report an error in the Blender API? [duplicate]

I'm reading it and trying things and e.g this is not true anymore: ...
0
votes
0answers
41 views

Help with GPU Shader Drawing?

So I am trying to make a custom brush size similar to Sculpt mode: This is for visualizing the Brush Proximity for an object with Dynamic Paint modifier. I have this example which draws a rectangle ...
0
votes
1answer
30 views

Add-On Dev: Open external file with default program

I was planning to create some simple help-like text or HTML documents in a local folder of my add-on, and provide "help" buttons on the panels to allow the user to access them from each section that ...
1
vote
0answers
11 views

Add-on Dev: Label Tool-tips?

I have a list of 12 'elements', where several check-boxes will relate to each element. The best way I can think of to handle this type of situation is to draw the check-boxes without labels, then ...
0
votes
0answers
20 views

Add-On Dev: PropertyGroup Constructor

Is there any way to define a constructor-like mechanism for a class derived from bpy.types.PropertyGroup? I have two instances of the same property group class, ...
0
votes
0answers
88 views

Blender Add-On Dev: importlib.reload()

Has anyone found a good way to use the importlib.reload() function? I just realized that every time this is called to reload a specific module, it completely ...
1
vote
0answers
54 views

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 ...
0
votes
0answers
153 views

How can I detect when the active or selected object changes using Python?

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 ...
2
votes
0answers
61 views

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, ...
1
vote
1answer
246 views

Blender Python: Declare Property Group (on the stack?)

The questions keep coming, I know. I cannot find this simple answer anywhere. It may be because I'm not sure exactly how to phrase it in searches. Is it possible to declare a variable of a custom ...
0
votes
1answer
48 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? ...
2
votes
0answers
49 views

Blender Python: Access Selected Collections?

How would I go about accessing the list of selected collections? It seems as though the selection state of collections is something specific to the Outliner? But I can't seem to find anything in the ...
0
votes
0answers
31 views

Blender Python: Print debugging text from functions

I'm looking for a simple text-print setup where I can see multiple text outputs (multiple lines of text), similar to writing to a text file while ending every statement with an end-of-line. A simple ...
0
votes
1answer
46 views

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, ...
1
vote
1answer
57 views

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 ...
1
vote
1answer
110 views

Blender Python: setter not working

Can anyone help me understand why my setter works sometimes, then it will stop working, then start again? For example, I can referesh my add-on, the setter will not do anything but throws no error, ...
0
votes
0answers
100 views

Blender Python: Detect Collection Exclusion Checkbox? [duplicate]

Is there any way to logically check the state of each collection's primary checkbox (the one to the left of its name in the outliner)? When the box is toggled, the info panel shows "bpy.context.scene....
1
vote
3answers
683 views

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(...
4
votes
0answers
48 views

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 ...
0
votes
1answer
182 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. ...
0
votes
0answers
46 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: ...
0
votes
0answers
95 views

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 ...
0
votes
1answer
94 views

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 ...
0
votes
0answers
15 views

Building blender in custom folder?

How do you build Blender in a custom folder. I did this and it works once. make full x64 builddir name_of_new_build_folder but when I run the same again I get ...
1
vote
1answer
35 views

Why blender is not registering its website on brave rewards?

I was trying to send blender some fund but my brave browser said that blender website is not registered for brave rewards.
1
vote
0answers
202 views

can I use tkinter with blender?

I want make game engine i can use bpy without run blender but I do not know how to create gui with bpy is there are way to create gui with bpy or use by with tkinter
1
vote
0answers
35 views

Where should I start to learn the internals of Blender?

I have tried the new blender 2.8 canidate version and am impressed so much. I would like to learn more about the internals of it. Could you guys point me some links ? I will appreciate it. Thanks! /...
0
votes
0answers
62 views

Python Addon Can't Locate Submodule Folder

I'm trying to build an addon that has multiple sub-modules located in the same folder as the __init__.py that pulls everything together. It's exactly the same set-...
0
votes
1answer
48 views

Using the node editor in a private project

Developer question: Is it possible to grab the Node editor (i.e. the one used for compositing) and define my own elements for a totally different project? I'm just looking for the nifty graphics and ...
1
vote
1answer
43 views

What brings 3d software to gain weight?

I would like to ask a somewhat unusual question. A few days ago I downloaded the 2.26 version of Blender and I noticed that it weighed less than 5mb, what I wonder is why today Blender (but in general ...
2
votes
0answers
12 views

How to contribute as systematic beta tester

I am torturing Blender 2.80 beta as video editor to try to uncover bugs. I would like to know if there is any kind of list of tests to be done, in order to help developers.
1
vote
1answer
280 views

Patch notes for 2.8 beta?

Where I can see it? Doesnt seem to find anywhere. And new updates are released every day it seems? Should I update Blender every day too? Afraiding of that something will be broke in updates, like ...
1
vote
1answer
780 views

Running Blender under Virtualbox

I setup a VirtualBox machine under Windows for dev related stuff (python, visual studio etc), everything works except that I cant run Blender :( it crashes with ...
4
votes
1answer
3k views

How to edit 2.8 UI icons?

Blender 2.8 comes with a set of monochromatic icons which seem to be stored inside datafiles/icons/*.dat. How can these icon files be edited/replaced with other/...
1
vote
1answer
167 views

Event key for “TAB” and “TAB + shift” on add-on modal?

I am finalizing a Blender add-on and I have an issue on the modal part with 2 events triggered by TAB or TABSHIFT. Here is the actual code: ...