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.

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9 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 ...
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1answer
434 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 ...
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1answer
37 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 ...
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1answer
33 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.
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1answer
28 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, ...
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1answer
37 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, ...
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1answer
83 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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1answer
2k 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/...
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1answer
24 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 ...
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13 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, ...
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0answers
9 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 ...
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52 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 ...
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31 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 ...
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38 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 ...
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46 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 ...
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1answer
47 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 ...
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0answers
30 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, ...
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1answer
29 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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30 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 ...
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3answers
149 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(...
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35 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 ...
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0answers
41 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....
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24 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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38 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 ...
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1answer
55 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 ...
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14 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 ...
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1answer
71 views

How do I sort out this tracking actuator?

So without explaining everything, the tracking sensor tries to track to an object in a different layer that hasn't been added into the scene. To fully explain, the problem lies within which object ...
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0answers
96 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
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33 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! /...
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29 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-...
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1answer
33 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 ...
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1answer
36 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 ...
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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.
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1answer
272 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 ...
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1answer
113 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: ...
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0answers
69 views

Real World Roughness Samples in Blender

TLDR: We've developed a method to measure a surface's microfacet distribution, and are looking for a way to integrate this in a Cycles shader. For more info, see this paper. Hi all, Together with a ...
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1answer
23k views

What's the purpose of the EEVEE rendering engine?

Is it an alternative to Cycles, or just for the 3D viewport?
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2answers
809 views

EnumProperty fill dynamically using callback

Fellow pythons, greetings. I am trying to create a dynamic Enum property that lists all objects on the scene with a certain custom property. However, whenever a new object is created on the scene (and ...
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229 views

Source Code Blender

Can someone tell me in which part of the source code is this section of tabs? I have searched a lot but in fact I need help because it is too long both in lines of code, as in number of files, and it ...
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0answers
88 views

Blender(cycles) fails to render correct values in some pixels. Fails to hit correct triangle. Why? And how to avoid this problem?

I do some rendering in blender(cycles). I render with the help of cycles nodes .exr images, where in each pixel instead of rgba-channels I store xyzObjectIndex-channels. Everything works fine up to ...
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1answer
494 views

Blender linear RGB to sRGB conversion

Does anybody knows what operation Blender does when it saves the image to .png file? I am interested in an exact formula, it might be also the source code. What I found in source till now is RGB->...
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1answer
54 views

Properties Editor: How to change short to int for “Pass index” button in Relations?

I am numbering objects in my scene with the help of "Pass Index" button. . Apparently this button is short and it can not be set to more than 32767 objects in the scene. I would like to change ...
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0answers
48 views

Writing rendered image to file (C++)

I am trying to modify a little bit the source code of blender to fit it to my needs. Does anybody know which function is responsible for saving a rendered image to file? Thanks in advance. What I ...
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0answers
119 views

Create a Button with a Large Icon

How would I add a button with a large icon in the Blender interface in my menu for an addon? I figured out how to make a button with a small icon on the left side, but if I want an image to be the ...
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0answers
48 views

When I try to call a mode_set operator from one of these handlers, the traceback blender crashes

I tryied to come with a elegant solution fot easily removing handlers from blender. I was thinking in something like that. The cool part is that in this case you can have independent namespaces for ...
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1answer
55 views

Is there a reason why handler functions are added differently from custom driver functions?

If I add a handler, I use: bpy.app.handlers.handlertype.append(captainFuture) If I want to remove it, I usually use the cheap way out since I still haven't ...
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1answer
372 views

How to create a minimap with independent movement?

How can I adapt this script to the following needs? I want to be able to... move camera only camera travel a long the mini map shows the map in a litle circle in a corner of the screen without ...
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2answers
733 views

Search custom properties in objects on the scene (Python)

Is it possible to somehow search all objects on the scene which have a custom property enabled using prop_search? I know how to do this with dynamic EnumProperty but it seems to be not an option as ...
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1answer
2k views

Download a specific Blender source version from Git

I've installed and use official Blender 2.79 on my Os X. Now I'd like to better understand its structure, and try some development. So I'm trying to download hash 5bd8ac9 11-09-17 from git (the hash ...
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1answer
1k views

Does Blender have a Wayland backend?

I'm working on trying to submit a bug for an issue while running Blender 2.78c under Wayland, and need to know if Blender has a Wayland backend, or if it is still using X11 via Xwayland when running ...