All language subtitles for A_13_npr_tricks_denoise

Hello guys and girls! Gleb Alexandrov here :) time
to dive into the NPR tricks! post-processing

and other delicious stuff. and the first one is
gonna be Denoising. first of all in order to use

and abuse the denoising algorithms we need to have
Cycles set up as our render engine and we need to

see what we are doing, so the real-time viewport
may come in handy. make sure to switch it on. the

3d scene here is very simple indeed, just a couple
of light sources and a heavily stylized tree model

by Manu Järvinen and the orthographic camera
actually, because that's also something that adds

towards this type of stylized look. we have talked
about the orthographic cameras in the perspective

tutorial by the way. so the setup is primitive
indeed, feel free to download the project files,

and now we just need to activate the denoising
within the render settings tab. it can either be

Optix if you have an Nvidia GPU or Open Image
Denoise which works on all kinds of hardware.

so why do we even mention denoising
in the post-processing tricks video?

because it produces a pretty neat effect
especially at the lower sample count, which i will

demonstrate in just a moment. i will switch over
to Optix because i found out that it's a little

bit speedier, but ultimately that depends on the
video card. and i'm gonna reduce the sample count,

that's the crucial bit. if you want the denoising
algorithm to mangle the image in the artistic way,

we should set the render samples as well as the
viewport samples to some super low number, for

example one. we can't go lower than that. so right
out of the box we can see how the the edges

of the 3d model as seen in the rendering got
much murkier and this effect is less prominent

uh... the higher we go with the sample count. so it's
advisable to keep it at 1 if possible because

that will give the most prominent denoising effect.
and it also depends on the resolution so if we go

quarter of the 1080p resolution, the effect will
be even more pronounced. notice a smoodging effect

around the edges especially, when the sample
count wasn't enough to produce a clear result.

that's what makes this effect very painterly and
kind of beautiful. it looks especially interesting

in motion, when each new frame receives slightly
different treatment by the algorithm of denoising.

now let's have a look at a slightly more advanced
post-processing implementation of denoising,

based on the example of this amazing scene by Alex
Heskett. Alex, thanks for sharing this amazing tip

on your twitter! so here we have the Cycles render
engine, once again we need Cycles for it to work

48 render samples and in the Denoising tab here
we have nothing checked on. that's because this

time we're going to use the compositor, but
first let me render the image out, it renders

blazing fast even though it Cycles and whoa! right
away we can notice firstly that the landscape is

gorgeous and secondly that we still have a lot
of noise and all of this noise is deliberate.

having a grainy source is a precondition for using
denoising in a creative way, so here i'm navigating

into the compositor, the Use Nodes checkbox should
be turned on. to make it slightly easier i'm going

to enable the viewer node so we can preview
each individual node and its outputs. now we can

Ctrl Shift and click on the node to preview
its outputs, Ctrl Shift and keep clicking to

browse through multiple outputs at once, so the
catch is that we should use the noise texture.

something like that, a simple white noise,
that's as close as you may get to visualizing

entropy i guess :) and in a moment we'll use
it to corrupt our render, to add even more

noise on top of it. so here we have the Mix node
switched into the linear light blending mode

and we mix two outputs: our render and this white
noise and we actually use a very minimal amount of

mixing, just 0.075 or something like
that and predictably we need to use

the denoising that can be found under Filter,
Denoise, so M to switch it on Ctrl Shift click

to preview the last node in the chain and bam!!
we have made this whole thing instantaneously

much more painterly. it's a wonderful byproduct
of the extra grain passed onto the Denoise node

which is basically the Intel Open Image denoiser,
but implemented within the compositor nodes.

all right! lastly we can try tweaking the mix
factor but i think we shouldn't overdo it, really.

as for me the effect is already quite pronounced,
just look at this grass, it's unbelievable how

subtracting the the details, the grain... makes
it look more NPR and more two-dimensional in terms

of some implied two-dimensional technique and if
you want to take it a bit further you can wash it

out by using lower contrast, maybe color balance it
add some glare everything that will take it even

further away from the sterile three-dimensional
look. all right! thank you so much, Alex, once again

for showing us this implementation of
the effect. keep doing amazing things ;)