Questions tagged [python]

Python is an object-oriented programming language. In Blender, it is used as a general purpose scripting language and to create add-ons to extend Blender's functionality.

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Custom trackpad pan/zoom/rotate behavior add-on

I'm trying to write an addon to customize the trackpad panning, zoomimg, and rotating gestures, but can't find a way to read the actual trackpad parameters for position and so on. The properties in ...
rraallvv's user avatar
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11 votes
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563 views

Save screenshot (bge) without writing to disk

This is a little odd but I need to save a screen-shot as an array (numpy array for eg) without writing to disk. The idea here is to create and then call the array once per frame in an external script ...
Snesticle's user avatar
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10 votes
1 answer
630 views

How can I get a list of currently running modal operators?

Here I found a working solution using ctypes which allows to find out if any modal operator is currently running. I am not good in C and don't understand how it works. But I'm sure someone does, so is ...
Andrey Sokolov's user avatar
9 votes
0 answers
219 views

Play/animate images, spritesheets or video files in 'template_icon_view'

I want to "play" some animation in this UI space, the template_icon_view: I can load all the images I want, for example: I know that the gif format is ...
yhoyo's user avatar
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8 votes
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686 views

Operator tooltip from layout text

The concept is to make a panel layout that emulates the workspace (screen) layout. While testing I have set all the buttons to be the Splash Screen operator. An image of how this looks for five ...
batFINGER's user avatar
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8 votes
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Blender on Windows is skipping python script. (brenda on windows)

We've been using Brenda for quite some time now for rendering architectural stills. Since our editing stations are doing nothing at night, I started making a desktop app that allows you to pick jobs ...
Wouter Vandenneucker's user avatar
7 votes
1 answer
248 views

How to display an image in my custom node

I have a custom node and I want it to be able to display an image. I know that the node has a parameter show_preview and if you enable it, no image appears.
user78950's user avatar
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7 votes
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601 views

Update function for NodeSocket?

How do I set a callback for socket input change (value or link change) when having a custom node? I have a socket defined like: ...
Hitokage's user avatar
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7 votes
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Is there a low level alternative for bpy.ops.object.convert(target='CURVE')?

(Note: Somebody asked there nearly the same question as me and got a very nice answer. However, this was to convert an object to a mesh. I have exactly the same context as this person but I want to ...
Arnaud's user avatar
  • 183
6 votes
0 answers
424 views

How do I change the width of operator popup?

I've done this simple operator taken from templates. How to change operator GUI width? I tried scale_x and ui_units_x but no ...
Kosmos3D's user avatar
6 votes
0 answers
664 views

Scale operator icon OR make template_icon clickable

I am trying to present the user with a gallery view to select a item from the thumbnails. Ideally, they click a button, are presented with the gallery view, and with a single click choose the item. I ...
dvhart's user avatar
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6 votes
0 answers
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Is there a low level alternative for bpy.ops.mesh.separate()?

I am dealing with a great model, I have a problem, I want to divide it by parts, but bpy.ops.mesh.separate(type = 'LOOSE') seems to have a big problem, that is not ...
Noob Cat's user avatar
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6 votes
1 answer
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How to wait for an operation - to another operator - to complete within an operator (import_scene)

Besides the point but why is this not working as a default stack is expected to work? I'm trying to get an operator to call another operator and wait for the operator's response before proceeding. ...
MostHost LA's user avatar
6 votes
0 answers
1k views

Can Blender automatically reload external script files when they are changed?

I came across this question: Is it possible to run a script from an external editor without reloading the file? Which also was asked over here in a similair format: Workflow for developing add-on/...
user007's user avatar
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6 votes
0 answers
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How to store rendered image as an nd array without saving the image in blender python?

After rendering using bpy.ops.render.render() to render the image. How do I store it directly to an nd array without actually saving the image and loading it back. I noticed that after rendering. ...
Sreenivas Murali's user avatar
6 votes
1 answer
2k views

How to update compositing nodes via script?

I create some nodes in compositing via python script: ...
Korchiy's user avatar
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6 votes
0 answers
960 views

accessing Blender objects from external Python IDEs

I would like to manipulate Blender objects from Spyder (not using the internal Python editor). Basically I would like to have Blender running and Spyder running as well, and then interactively access ...
Andre's user avatar
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6 votes
0 answers
487 views

Does anyone have an example of template_curve_mapping?

I'm doing some test with template_curve_mapping. I have write this code: ...
Antonioya's user avatar
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5 votes
0 answers
587 views

How can I make the text of my panel in bold or italic? this is blender python related

Basically what I want is to make my panel header in bold and other text in my panel to be italic. For example: I want the text 'settings' with the preferences icon to be in bold. This is the code for ...
Yuneth Alwis's user avatar
5 votes
0 answers
174 views

Finding which addon an operator belongs to

A recent question / answer involves what looks like an overridden operator bpy.ops.object.align() differing from the documented default, how do we find which addon(...
batFINGER's user avatar
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5 votes
0 answers
168 views

Object Picker Modal Operator?

I saw this question this morning and i'm also quite interested in a Picker modal operator, so I did tinker a bit and achieve a somewhat beginning of a working code but I encountered some problems ...
Fox's user avatar
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5 votes
1 answer
753 views

How can I use the 'Copy as driver' and 'Paste driver' functionality in Python?

I'm writing an addon for Blender 2.8. I have an object and want to drive the Y & Z Scale with the X Scale. Doing it manually with right click on the Scale shows me these commands: ...
CultLess's user avatar
5 votes
1 answer
104 views

How to check if the collection is selected in outliner?

How to check if a collection is selected or not in the outliner using Python? Here I've selected the following collections: "scene 1", "scene 2" and "scene 3".
Korchiy's user avatar
  • 179
5 votes
0 answers
170 views

How to access Density/Flame grid via Python in 2.82 (Mantaflow)

Does anyone know how do I access the density/flame grid for the new Mantaflow fluid simulation engine in Blender 2.82? The old path still exists: ...
Christopher Gearhart's user avatar
5 votes
0 answers
484 views

Removing space draw callbacks after losing the handle?

A small edit of test code from GPU Shader Module (gpu) "Mesh with Random Vertex Colors" to save the handle to the driver namespace ... ...
batFINGER's user avatar
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5 votes
0 answers
468 views

Can I measure the UI font size with Python in order split text into multiple lines?

Is there any way to get the size of UI text, such as when using layout.label(text="message")? I'm trying to create a simple message box popup that displays ...
Robert's user avatar
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5 votes
0 answers
133 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 ...
Robert's user avatar
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5 votes
0 answers
629 views

PyOpenGL and VBO Indexes

Long story short, I'm trying to do a modal handler that draws using OpenGL into the viewport. Immediate mode through BGL works fine, but is dog slow. I tried using VBOs through BGL but there seems to ...
Kiki W.'s user avatar
  • 606
5 votes
1 answer
332 views

"Search for unknown operator" On Start-Up After Removing Module and Shortcuts

For lack of a less drastic alternative, I created a whole module just for setting bpy.context.window.screen to a specific screen, since ...
Blitzen's user avatar
  • 182
5 votes
0 answers
146 views

What do all of the mode enums mean?

What do all the various mode constants in blender operators documentation do? bpy.ops.object.duplicate(linked=False, mode='TRANSLATION') - Duplicate selected objects Parameters: ...
anatoly techtonik's user avatar
5 votes
0 answers
238 views

How can I derive from an existing Operator in Python?

When creating a new Blender Operator, you'll derive the class from bpy.types.Operator, like this: ...
aliasguru's user avatar
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5 votes
1 answer
288 views

Cannot mix .user and .addon keyconfigs in register()

I've been messing around with keymaps lately and I've come across behavior that doesn't make much sense to me. I am searching the current keyconfig for a specific keymap item, removing it, then adding ...
Italic_'s user avatar
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5 votes
0 answers
689 views

Adding sliders from UI to pie menu

I've seen some sliders working in pie menus but the one I'm trying to add to my pie script isn't showing up. Its the 'autosmooth normals' slider from the Object Data tab, under Normals (in the ...
fjg3d's user avatar
  • 113
5 votes
0 answers
624 views

Hide filter options in UIList

I want the UIList to not show the filter options (inkl. the plus button). I've use following flag: self.use_filter_show = False The flag disables the filters ...
PHEDev's user avatar
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5 votes
0 answers
806 views

Converting an obj sequence to a .bobj fluid sim cache?

I'm wondering if there is any way to accomplish turning an obj sequence exported from realflow into a .bobj fluid cache that I could then trick blender into loading as a native fluid sim cache. So far ...
BenSimonds's user avatar
4 votes
0 answers
166 views

Migrating geometry shaders to Metal

I'm working on BlenderBIM (architecture addon for Blender) and we have a bunch of shaders to support plan annotations in viewports. Mainly it's simple shapes based of lines - lines, segment based ...
FamousSnake's user avatar
4 votes
0 answers
47 views

Python access Bevel Custom Profile handles

We can access the profile points via obj.modifiers["Bevel"].custom_profile.points[1].location But how to get the handles location at that point?
X Y's user avatar
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4 votes
0 answers
112 views

Detect when an Asset has been applied (dropped in the viewport)

So far this has been the way I check if World asset has been dropped in the viewport: ...
karlisup's user avatar
4 votes
0 answers
109 views

The documentation says frame_change_pre is NOT the ‘before the frame changes’ event. What exactly is it then?

I would have imagined that frame_change_pre is the event that happens, well, before the frame changes. Silly me! The documentation states (emphasis mine): Called ...
jwrush's user avatar
  • 782
4 votes
0 answers
153 views

How to build an autocomplete search to search for some words in memory?

I am using a StringProperty to assign a list of (Singles) words through manual entry, and I was wondering if you could build some sort of autocompletion for a StringProperty. Suppose I have a list of ...
Noob Cat's user avatar
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4 votes
0 answers
171 views

Is there a recommend way to repair or recreate a valid context after using `bpy.ops.wm.read_factory_settings(use_empty=True)`?

I am not sure if this is a bug or intended behavior, but using bpy.ops.wm.read_factory_settings(use_empty=True) reduces the context to a state where is cannot be ...
hz3d's user avatar
  • 41
4 votes
0 answers
103 views

Call function when collections are modified

I am writing an addon and I would like to update some of the properties whenever collections change: a new collection is created, a collection is removed, a collection is renamed. I am trying to use ...
Kevin's user avatar
  • 141
4 votes
0 answers
201 views

Strategy for script-generating a buckled honeycomb lattice mesh (hex faces) for animating 2D materials?

In this post I show how one can script-generate a square lattice with buckling. By scripting it there's memory of each vertex's identity which can be used later to animate certain behaviors. When ...
uhoh's user avatar
  • 2,667
4 votes
0 answers
191 views

How to dynamically load a .dat icon (toolshelf icon)?

Using documentation here 2.80/Python_API/UI_DESIGN, I've managed to create a custom .dat tool shelf icon for use with an operator in my addon. The icon will display from my addon when registered from ...
Sicut Unum's user avatar
4 votes
1 answer
532 views

How can i detect a scene change from python?

I am trying to detect when the active scene changes. Initially I tried using the message bus system to subscribe to bpy.types.Window, "scene" Like this: <...
Oliver Weissbarth's user avatar
4 votes
0 answers
271 views

How to delete element from UIList with a button, when the element is clicked?

I am making a simple addon, that keeps information about location of group of objects at different frames. Every time I make a keyframe on location for a group of objects, where each object has prefix ...
Ermakx's user avatar
  • 93
4 votes
0 answers
4k views

Blender 2.9 python Operator bpy.ops.object.mode_set.poll() failed, context is incorrect

I'm a bpy beginner and i'm facing a error with python scripting on the line ...
Dini's user avatar
  • 41
4 votes
0 answers
73 views

Instancing a space theme with a draw callback

In a somewhat tongue in cheek answer to https://blender.stackexchange.com/a/197340/15543 have come across the possibility of having one instance of a 3d view showing a different theme than another. ...
batFINGER's user avatar
  • 83.5k
4 votes
0 answers
287 views

How to split unconnected splines into separate Curve Objects without bpy.ops?

The following code separates unconnected splines into individual curve objects just fine (as far as I can tell). ...
Armored Wolf's user avatar
4 votes
0 answers
237 views

context is incorrect error in async method probleme

hey guys i'm trying to use some blender commandes inside a async methodes, but it seemes like blender commands don't work insisde async methodes, i will apreciate any help: ...
Ramzi Boufaa's user avatar

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