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28,956 questions with no upvoted or accepted answers
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42
votes
1answer
2k views

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 ...
22
votes
0answers
913 views

Property Panel Custom Popup Menu when user presses hotkey over an input field

is it possible to trigger this kind of menu: in the property panel when I press a hotkey over a button/input field? I want to specifically,when the user presses a specific hotkey when over an input ...
19
votes
0answers
689 views

How to make a dynamically expanding menu in Blender?

Say we want to navigate a tree structure without knowing all the data ahead of time, is it possible to do this in Blender? For example, a menu which dynamically loaded a directory hierarchy from the ...
14
votes
1answer
2k views

Per-Vertex lighting in GLSL?

How can I achieve per-vertex lighting (like in single/multi-texture shading) in GLSL with all of the other GLSL features (like buffer shadows, texture layers, etc.)? Bonus points if it can be done in ...
12
votes
0answers
367 views

Generated Previews - low-resolution and dark shading fix?

(2.79 - Blender Internal) Generated Previews is very handy feature for previewing assets when importing / linking, I would just like to know if there is a way to: Make thumbnails lighter to match ...
12
votes
1answer
2k views

How does blender calculate poseBone.matrix?

How does blender calculate a poseBone.matrix through the hierarchy chain? A bone's final matrix is a transformation matrix which defines the bone in armature-space in the current pose (M1). I want to ...
12
votes
1answer
385 views

What do different execution contexts mean?

The documentation says that I can invoke an operator with a different execution context, either invoking or executing it. What I know is that invoke will most often ...
11
votes
1answer
747 views

Control Instance Color with Geometry Nodes

I'm excitedly playing with the new Geometry Nodes system, but I've run into a limitation. I would like to control the color of object instances created with the ...
11
votes
0answers
268 views

Set Active FCurve in Graph Editor through python

I'm trying to set an FCurve in the Graph Editor to "Active" through python. In the API FCurves don't actually have an "Active" property, but manually click-selecting a channel or keyframe on an ...
11
votes
1answer
1k views

Apply force along normals of cloth mesh

I'm trying to simulate an inflatable mesh by applying a force field to a cloth. As air pressure always acts perpendicular to a surface it might be a close enough approximation when pushing all ...
11
votes
0answers
2k views

Linking object data without changing rotation?

I have multiple objects that I would like to all use the same mesh but maintain their individual rotation positions. As it is, when I link their object data, all the objects rotate to the same ...
11
votes
0answers
355 views

How to call original operator from operator's override?

I would like to amend functionality of an existing operator with a condition check and then "proceed" with the original operator (if condition check allows it). It is essentially what is ...
10
votes
1answer
196 views

ignore self-shadows for a cel shaded effect?

So For this project i'm trying to achieve somewhat of a cel-shaded look. Cel Shading is an attempt to make 3D Art look 2D, But The Main problem I've found with Cel Shading effects is the shadows are &...
10
votes
0answers
728 views

Stencil Image low resolution

I am trying to texture paint a mesh using a pretty high resolution stencil image.. But when i try to zoom into the image to paint the details...it appears very low res... Is there any way to make it ...
9
votes
0answers
172 views

When is the depsgraph_update handler triggered? (and how does the depsgraph work? )

I've been looking at the depsgraph changes in the documentation here, but I don't know if I understood it right: the dependency graph is a sort of diagram that links data blocks to each other so that ...
9
votes
1answer
598 views

Change multiple custom properties simultaneously

When I ⌥ Alt LMB on a transformations property, I can change multiple the property for multiple object with once input action. The property turns blue for the duration of the operation. Is ...
9
votes
0answers
1k views

Does a model exporter embedding materials as GLSL scripts exist?

as described in Blender Shader in OpenGL/GLSL, it is possible to export the (unoptimized) GLSL code generated by Blender for a given material. Since the viewport can use such GLSL for real-time ...
9
votes
0answers
467 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 ...
8
votes
0answers
82 views

Floating point precision problem with transparency?

I guess this is a question of understanding, but perhaps I'm overlooking something which might solve my hassle with rendering of objects with transparency in cycles. I'm working on a project with ...
8
votes
0answers
160 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 ...
8
votes
0answers
103 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 ...
8
votes
0answers
70 views

how to write a custom projection type?

Is it possible to create a lens shader with EEVEE/Cycles ? I'd like to have the control over the camera position and the ray direction per sample. This allows to simulate various conventional lens ...
8
votes
0answers
462 views

Why were default camera settings changed in Blender 2.8?

Default settings: v2.79: Lens 35mm, Sensor 32mm v2.8: Lens 50mm, Sensor 36mm Just out of curiousity what is the reason for that change?
8
votes
0answers
278 views

3D Stereo Active shutter vision LCS glasses realtime viewport?

Is it possible (or maybe already implemented by someone) to configure the viewport to display stereoscopically at a set frequency dependent on the given screen refresh rate, while having the frequency ...
8
votes
0answers
283 views

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 ...
8
votes
0answers
617 views

How to bring the context “back” after running read_homefile()?

When I run import bpy bpy.ops.wm.read_homefile() and then I replace the above with this (in the same text data block) ...
8
votes
0answers
1k views

Seamless Procedural Texture in Polar Coordinates

I've written a Cycles node tree to convert rectangular (X,Y) to polar coordinates (R,theta) as the basis for a procedural texture with radial symmetry. However, there is a seam in the texture where ...
8
votes
1answer
1k views

Antialiasing textures in cycles (Blender 2.77 and higher)

I would like to get an answer to a frustrating question. https://wiki.blender.org/index.php/Dev:Ref/Release_Notes/2.77/Cycles In this link is "Anti-Aliasing is now enabled for baking. (c359343)" ...
8
votes
1answer
317 views

How to load an internal blender image using OSL?

OSL has the texture command that we can use to load image files and map in an object. Dfelinto made a nice video about it some years ago. https://www.youtube.com/watch?v=V5N2rnFtSlw We also have many ...
7
votes
0answers
90 views

Is it possible to pass a [color ramp] to a node group?

Are there any addons or other features in Blender that allow the Blender user to write nodes that passes in color ramps and reuse them in a group node? If the answer is yes, then what are the steps? ...
7
votes
0answers
158 views

How to redraw status bar in Blender 2.80

I've added my own progress bar to the Blender 2.80 status bar (the footer of Blender) with the following abstracted code: ...
7
votes
1answer
472 views

Trails Behind Projectiles

How would I add comic-like trails to projectiles, such as arrows? I have an example from YouTube, but the effect is done in another software. https://www.youtube.com/watch?v=K4lmGGSsFYg The effect ...
6
votes
0answers
27 views

Is there any way to convert generated volumetric shader into the mesh?

Now that we've got Volume to Mesh modifier - which is so cool - we can make meshes from the simulations, like Open VDB sequences, etc. But it seems that it doesn't work with procedurally generated ...
6
votes
0answers
64 views

Flip Normals with Geometry Nodes

I have geometry being created through geometry nodes and I am am trying to flip the normals on this duplicate geometry. However, it appears that normals are a read only attribute in the geometry nodes....
6
votes
0answers
44 views

Is there a way to create a dual mesh using geometry nodes?

I'm trying to create a dual mesh, as described by Alessandro Zomparelly, but procedurally using Geometry Nodes. I've only come this far, but now I need to dissolve the vertices of the original mesh, ...
6
votes
0answers
43 views

Advice on modeling stereographic projections?

Hoping to get some advice on modeling stereographic projections. I found a pretty manual process but it doesn't hold up if the model gets too complicated. To clarify, I'm working with meshes because ...
6
votes
1answer
102 views

How to procedurally model a non-linear screw? / non linear modifier

I am trying to achieve a non linear (gradually) screw procedurally, by this I mean the distance between each turn of the screw get smaller and smaller, this result should be obtain with modifier in a ...
6
votes
0answers
44 views

Rendering large image sizes in Eevee (Over 64k pixels)

I am working on creating a wrap for several walls spanning 25 to 60 feet long. People are going to be looking at these fairly close so I don’t want to go below 200 dpi for my final print quality. That ...
6
votes
0answers
46 views

Is there any way to turn coordinates into curve?

I recorded fly camera movement, so I got keyframes with coordinates. Is there any way to turn the camera coordinates in keyframes into curve?
6
votes
0answers
267 views

Curious to Know Official Names and Meanings of Various Properties (Custom, RNA , ID, etc.)

I sometimes find it difficult to recall what type of properties a Blender user or addon has, as well as what choices it brings. ("Set Driver", etc.) I know there are clear differences ...
6
votes
1answer
1k views

Vertex Normals different from loop normals

I'm writing a model exporter in Blender 2.77 and except from triangles and vertex positions, I also want their normals and tangents. As an example, I'm using a simple cube centered at the Origin (0,0,...
6
votes
1answer
234 views

How to speed up loading of custom external icons?

I have developed a little addon that provides icon button in the node editor. We have 80 node items. And so i have 80 external icons to load. I use custom_icons.load for that. The problem is, every ...
6
votes
1answer
1k views

How to update compositing nodes via script?

I create some nodes in compositing via python script: ...
6
votes
3answers
472 views

Global Slow-mo effect - Animating Time scale

Is there a way to animate the timescale of a scene for a small amount of time? I'm looking to create an animation, and in the middle it goes from 1.0x speed, to 0.125x speed (1/8th normal speed), but ...
5
votes
0answers
41 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(...
5
votes
0answers
99 views

How to create a growing bacterial colony?

So, I've been trying to create a short 3D animation of a bacteria dividing|splitting itself multiple times like this I adjusted some shape keys for it, but I think it would be too overwhelming to ...
5
votes
0answers
42 views

Is it possible to combine rigid body and soft body physics in the same object?

In blender as most of you know there is an option in the animation tab to have soft body and rigid body physics on an object. On a project that I am currently working on I need soft body on one part ...
5
votes
0answers
214 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 ...
5
votes
1answer
261 views

Hotkey to navigate scenes in Blender 2.8?

In Blender 2.7, i could change the layout with Ctrl + ← and Ctrl + →. In 2.7, the scene was layout dependent, allowing me to navigate the scene this way. However, in Blender 2....
5
votes
0answers
114 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: ...

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