Sampling is KILLING your Renders in Blender

Welcome to CG Torus! In this video, we'll explain how samples work in Blender, how they affect our final render, and how the synergy between samples and resolution enables us to achieve different outcomes in terms of visual quality and efficiency.
Additionally, I'll provide you with a guide on how many samples to use in a render, so you can enhance the quality of your images.
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#blender #blender3d #blendertutorial

[@Dilligff]

Something only mentioned in passing is that lighting and complex interactions such as caustics, refraction, etc. play a huge part in how many samples are needed. A well lit simple scene will require far fewer samples than a darker or more complex (lighting wise) scene. Also, many avoid using the denoisers altogether by rendering at higher resolution and downscaling as the built in algorithms for doing so often remove most noise and fireflies in the process without the blurring.

[@NovaPulseEcho]

the noise threshold is more important than the samples… the noise threshold controls your quality and render time

[@CGTorus]

You're absolutely right! A video about that is on its way.

[@advladart]

@@CGTorusyess i would love a comparison on noise threshold.

[@pablog.511]

I have rendered images with 0.5 Noise Threshold and samplings of 1200 and image looks good.
But with the base threshold and just 200 samples the image looks waaasy better in details (using Openimage denosier)

[@theftking]

It is and isn't. Depending on the complexity of the scene, there are circumstances where a lower noise threshold + lower sample counts produce better results in less time.
That said, I'm speaking from an animation perspective where _temporal_ noise is the big issue and ultra sharpness isn't paramount.

[@ExacoMvm]

@@advladart Noise Threshold is just a setting which stops sampling when certain noise level is reached in certain pixel/area. I believe 0.01 is considered 1% of Noise level.
So if you want your noise level to be 1% ( barely noticeable noise ) you can set samples to 9999 and render using 0.01 Noise Threshold, it will do the math for you and you'll get best speed possible for reaching that threshold.
Also don't forget about Ray Depth which can also speed up the rendering especially in interior ( low light, high GI ) and complicated scenes.

[@YiqunMa]

I found out that rendering with 50 samples on 4K is better (crispier image) compared to something like 150-200 samples on 2K

[@DadicekCz]

There's a setting that keeps rendering more samples until your image meets a certain noise level
Edit : it's called Noise treshold, it's locsted in the render settings

[@osatoharuna]

For realistic scenes I honestly prefer the noise you get with lower samples. It's like built in film grain in a way

[@3DMVR]

shit looks better while rendering sometimes lol

[@ly_is_music]

Absolutely! I've actually almost stopped using the denoiser all together, as it really doesn't look realistic to have anything look that smooth

[@3DMVR]

@@ly_is_music lmao its so funny how good it looks while sampling and then the denoiser applys making it a watercolor

[@ly_is_music]

@@3DMVR XD yeppp exactly
I also often times use the "seed" function for animations, so you get a different noise pattern per frame! So essentially creating like film grain!

[@3DMVR]

@@ly_is_music oh damn didnt know that was a thing interesting

[@AnimeEye1]

Can you please drop a tutorial on texture projection mapping and texture painting? In blender 4.0

[@3dandme777]

Great tutorial, thanks.

[@EmpireAnimator]

It's the best video to speed up Cycles render 🎉 you explained it very clearly ❤, Thanks for your Research

[@VFX]

great video, great editing, wish you could've talked a little bit more about noise threshold tho!

[@CGTorus]

Of course, it will be the next video, actually. Thank you for your support ☝🏼🤓

[@ForcePF]

If you want to know more about noise threshold, the channel "Blendergrid" has an excellent video on the subject. (I'd give you the link, but comments with links in them don't seem to work).

[@ShiroiAkumaSama]

On a highly detailed character high sampling can make a huge difference.

[@Tincoco_]

nice tip for anyone. you can always render your projects as you work on it to gauge what the scene will look like and to see how many samples work.

[@hjvhjfv6320]

This is very helpful, also you sound like Stavros Halkias.

[@EricKinkead]

Rendering on an Apple M1?!? You just earned a subscriber!🎉

[@daniel_8]

what??? you mean unearned a subscriber??

[@EricKinkead]

@@daniel_8 no, earned. I have an M2. Apple Silicon is the way. 😉 plus you don’t need a noisy rig with fans that’s the size of a college dorm fridge. 😂

[@daniel_8]

@@EricKinkead I was a bit too mean, the video is very good at explaining samples. I just hate apple hardware.

[@DadicekCz]

Blud is supporting Apple bruh 💀

[@EricKinkead]

No worries 😉

[@xouzouris]

Did you make this example scene? If so, where did you find the textures?

[@reddy6024]

Bro I am having 8gb Ram 64 bit and an SSD and I want to build basic hard surfacing models can I go with my current configuration do I need to increase more,

[@ExacoMvm]

You forgot to talk about Noise Threshold and Ray Depth ( new in Cycles X ).
I think for still images very high samples ( 4K+ ) and low noise threshold ( 0.0075 - 0.015 ) and denoiser off/on depending how important material details are is top priority because it will render in a such way that noise is even on the whole image.
For animations low sample count ( 64 - 512 ) should be priority and high threshold ( 0.02 - 0.3 ) w/ denoiser on, lower ray depth and ideally using static noise if Cycles has this feature.

[@eclairesrhapsodos5496]

In Maxwell render there is lesser samples but each sample gives big difference. For most scenes 20 samples is enough with denoiser on but for some scenes it might require up to 50 samples which might take up to 4 days of rendering (it's resumable even after closing app). So technically each new sample is twice of previous results but before 14 samples it's less of time.

[@Kryptonian0024]

Much ram do we need for blender ?

[@the_glitch]

Amazing vid. I thought u had like 100K subs at least :D

[@CGTorus]

Thank you so much. I hope to have those subs one day 👀

[@memeycorny7773]

thank u lots

[@TallSilhouette]

Seems a bit low for any scenes with fine detail prone to artefacts. I lean toward 4k at 1024 samples. 0.1 noise threshold for fast stills. No noise threshold for quality stills and animations (overnight render for the latter).

[@adityatiwari3646]

Thankyouu😔

[@USBEN.]

64 sample upscaled renders 😈

[@captainblack-pj3ix]

The entire meaning of the video can be summed up in one phrase: "It depends on your project"🤣

[@LarsHost]

Why would you compare denoised low sample image with denoised high sample image? I mean you don’t need denoising on 2000 sample image (in this particular case). You just f* up your render with denoising bro

[@maulanaaldhira4539]

How to render in little block like that?

[@CGTorus]

In the render section, there is a part called Performance. If you open it, you will see a value called Tile Size, which is set to 2048 by default. You can set it to any value you want, but I recommend multiples of 2, such as 16, 32, 64, 128, etc. Reducing this value usually decreases the rendering time (only a little bit)

[@basquescout]

Noise Threshold is even more important than render samples

[@wendysburgers4326]

ADJUST NOISE THRESHOLD
NOT only resolution and Sample Count.

[@Btomaek]

The voice sounds off to me, it’s a bit hard to focus on what you typed

[@basquescout]

14:39 mins for 512 samples and not even 1080, holy crap. Rendering in apple must be like waiting to rain in the desert

[@helloitsokyrago]

i use 64 for every render

[@nonamech14]

I can wait whole day for good render and i dont care about the settings