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15 votes

What computer should I buy for Blender? How do I choose hardware?

According to rules, hardware questions are off topic here. You can ask about them over at Hardware Recommendations or other third party communities like Blender Artists Forum. To not leave you empty ...
Duarte Farrajota Ramos's user avatar
14 votes

What are the pros and cons of using Blender on Windows or Linux?

It is commonly said that performance is generally faster under Linux based operating systems, both during regular program operation and rendering. Linux is also commonly said to consume less resources ...
Duarte Farrajota Ramos's user avatar
14 votes

How to find the number of loose parts with Blender's Python API?

Recursive Bmesh version Similarly to the way other bmesh operators, BMesh.Ops are used, get_islands(bm, verts=[]) ...
batFINGER's user avatar
  • 84.6k
13 votes
Accepted

How to find the number of loose parts with Blender's Python API?

I propose another approach based on dictionaries and sets, for performance purpose. It allows here to calculate a 1080 times arrayed sphere with about 500k vertices in 3 seconds. The principle is to: ...
lemon's user avatar
  • 60.5k
13 votes
Accepted

What is Clamp Direct/Indirect?

Clamp puts a limit to the intensity of light bounced directly and indirectly by surfaces. It can be used to prevent the annoyoing "fireflies" (random intense pixels in your render) but it is advised ...
Gez's user avatar
  • 2,230
12 votes

Is it possible to render a movie on a single computer in blender?

It is possible to render a movie on a single computer. It depends on what movie it is. If you choose a style that renders extremely fast, it is possible. Nothing like the ones Disney make though. Not ...
Martynas Žiemys's user avatar
11 votes
Accepted

Should I wait when Blender isn't responding?

You can wait if you want, but it's probably going to take a long time before it will start responding. If you close it there is a way to recover you data; Blender autosaves your projects every 5 ...
John's user avatar
  • 369
11 votes
Accepted

How to display calculation time above nodes?

To do this, simply activate the "Timings" option in the top right menu. Note, however, that this is more of a guideline than a reliable indication of the computing time. Changing the ...
quellenform's user avatar
  • 37.8k
10 votes

What are the pros and cons of using Blender on Windows or Linux?

If you are using CUDA rendering, Linux is faster by 20-40% due to the overhead of WDDM in Windows 8/10. This is regardless of if there is a display plugged into the GPU or not. To work around the ...
Mike Pan's user avatar
  • 11.9k
10 votes
Accepted

Blender Global undo is very slow on complex scenes

The undo buffer works by actually saving the entire blend file in memory, and loading it to undo. If you have such big, complex files, that'll take a while. A possible way to speed things up would be ...
dr. Sybren's user avatar
  • 7,234
9 votes
Accepted

Are there any ways to speed up blender compositor?

You can change the lines to be straight by going to "File > User Preferences > Themes > Node Editor > Noodle Curving". You can disable "Use Nodes" to keep it from updating until you are done moving.
JakeD's user avatar
  • 8,527
9 votes

How to find the number of loose parts with Blender's Python API?

That code makes a different thing - it finds the vertices that belong to the loose parts. But, the code is much clearer. If you need the count, just take len(). ...
BlackCutpoint's user avatar
9 votes
Accepted

Geonodes: which is faster, Set Position or Transform node?

Blender 3.6.0 Testing on Suzanne, ✲ Ctrl5 5 subdivision levels, and this setup: All measurements are done on the Group Output of the above, while modifying the contents of the i custom group. ...
Markus von Broady's user avatar
8 votes
Accepted

OpenCL vs CUDA Rendering

Go with the Nvidia. Performance aside, CUDA works better with Cycles. Until recently, OpenCL was not even supported in Cycles so it is not as bug-free and stable as CUDA. Another thing to consider ...
PGmath's user avatar
  • 25.2k
8 votes

How is real-time rendering different in blender from game engines?

Well, Blender isn't a game engine, and it's not designed to perform final animation renders in real-time the way a game engine does. The design goal of the EEVEE renderer is to provide real-time or ...
K. A. Buhr's user avatar
  • 2,183
8 votes

Need Technique for Projecting Countries onto the Earth

You could: Select all you countries and join them with CtrlJ Create 2 grids (delete faces only, keep the edges), one for the front, the other for the side view: Select one grid, shift select the ...
moonboots's user avatar
  • 163k
8 votes

Geometry nodes vs particle system

The big deal with geometry nodes is that we're effectively getting the functionality of geometry shaders now. That's kind of a blunt way of putting it, but if you look that up in the context of GLSL ...
Michael Macha's user avatar
7 votes

Why/how does tile size effect performance?

One thing not mentioned that is important for efficiency on multi-core hyperthreaded machines is the time cost of "tile stragglers." My machine has 12 cores and will spawn 24 rendering threads which ...
Jay Turberville's user avatar
6 votes

Optimize cycles background rendering

As of Blender 2.83 (currently in alpha at the time of this post), this can be solved by using the "Adaptive Sampling" option in Cycles. Adaptive sampling will automatically stop sampling in areas of ...
JtheNinja's user avatar
  • 9,142
6 votes
Accepted

Multi-core/threaded particle simulations

In Blender particles and simulations are still badly optimized and mostly single-threaded with no GPU compute support. With time features are added and even now you can look into the FLIP FLUIDS addon....
Jaroslav Jerryno Novotny's user avatar
6 votes
Accepted

Is there a way to make Cycles render slower to use less GPU resources

70 degrees is not too hot and it's completely normal for a working GPU. Something beyond 85 degrees would start getting concerning. Anyways, you may set the tile size to a low value (16 x 16 for ...
Amir's user avatar
  • 3,062
6 votes

Help me understand why my cycles render is so slow

I'm not too sure about the implementation of volumetrics in Cycles, but roughly speaking: without volumetrics, a ray direction must be evaluated only once every time it hits a surface. So the ray ...
Nicola Sap's user avatar
  • 12.9k
6 votes

Should I enable both my CPU and GPU in the CUDA preferences?

It depends if you want to use only your GPU for rendering or GPU + CPU. You will have to test what gives you a better rendering performance. Using a fast GPU with a slow CPU may result in longer ...
Robert Gützkow's user avatar
6 votes

New install of Blender; extremely slow when panning a video

Unfortunately, I believe this is 'normal'. It's 4k video, so it takes a lot to edit and needs a lot of optimization that is just not there yet. Make sure you update your video drivers because if they ...
Martynas Žiemys's user avatar
6 votes

How much better would blender be if I upgraded my Ram?

Use a System Monitor or Task Manager tool or similar (eg, ‘top’ on Linux) to see if your system is using all of its memory when you’re doing a large, slow operation. If you still have free memory then ...
Rich Sedman's user avatar
  • 44.9k
5 votes
Accepted

Copying an object with python without actually creating a new object

If it's speed you are going for ...
batFINGER's user avatar
  • 84.6k
5 votes

Cycles hybrid rendering

It's now possible with the 2.79 daily release to render with both gpu and cpu at the same time. Overall I noticed saving around 15 minutes on a 1 hour render. I didn't explore all the combinations ...
HellrazorX's user avatar
5 votes

Performance of mixing colors vs mixing colored shaders

If there is, it's a pretty subtle difference. I rendered 5 frames without the mix shader setup and 5 frames for the mixRGB node setup, and averaged the times for each. The results: Mix Shader: ...
gandalf3's user avatar
  • 158k

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