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.
3,770
questions with no upvoted or accepted answers
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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 ...
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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 ...
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526
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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 ...
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181
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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 ...
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146
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Numpy optimise mesh edges length calculation
To improve my very rudimentary numpy knowledge am going to ask a number of optimise my numpy questions here on BSE
Can find the length of each edge in a mesh using
...
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8
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332
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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 ...
7
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483
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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 ...
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7
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863
views
Override context for operator called from panel
I have an operator, “my_operator”, that is called from a panel, as follows:
...
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7
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537
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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:
...
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7
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570
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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 ...
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6
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211
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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.
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347
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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 ...
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6
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530
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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 ...
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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 ...
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6
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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.
...
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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/...
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6
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1
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499
views
How does 'Align Active Camera to Selected' decide where to place the camera?
Thanks to this answer, I'm using bpy.ops.view3d.camera_to_view_selected() to automatically place a camera so that it frames the selected object for rendering. But ...
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6
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How to update compositing nodes via script?
I create some nodes in compositing via python script:
...
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6
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429
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Does anyone have an example of template_curve_mapping?
I'm doing some test with template_curve_mapping.
I have write this code:
...
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5
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153
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(...
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5
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1
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96
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".
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149
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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:
...
5
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1
answer
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Why does bpy.ops.object.mode_set(mode='EDIT') switch to the Object Mode when executed?
I wrote a python script that modifies an existing blender armature that I have and some of these modifications include some commands that are only possible in Edit Mode. I know that depending on what ...
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314
views
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. ...
5
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593
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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 ...
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5
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1
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319
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"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 ...
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145
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:
...
5
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220
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:
...
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892
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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 ...
- 151
5
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1
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270
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 ...
- 1,533
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667
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 ...
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5
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528
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 ...
- 693
5
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766
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 ...
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4
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36
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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?
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4
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71
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:
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4
votes
1
answer
201
views
How to read out every camera object from blend file? (with blendfile.py)
I have multiple scenes in a blend file where each scene has multiple camera objects. Is there a way to read out every camera object for each scene? I can read every camera in the blend file, but I don'...
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74
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 ...
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129
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 ...
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136
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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 ...
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81
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 ...
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4
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179
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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 ...
- 2,657
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139
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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 ...
- 1,701
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155
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 ...
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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:
<...
4
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0
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213
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 ...
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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
...
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65
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.
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4
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204
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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).
...
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How to delete drivers via python?
I want to delete all drivers on object in Blender 2.8. I am quite new to the scripting and the only code I have found is this:
...
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208
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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:
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