SPEAKER: Hi everyone, and welcome
to this new animation tutorial. In today's video, we'll be
covering the Path Tracer. While chin motion is at its core
real-time visualization tool allowing you to navigate
inside and around your project with a really stunning visual
quality as we can see here, there is also the ability
to switch to the Path Tracer, which will give you
photo-realistic results in just one click. To cover that, I'm
going to move inside. The advantage of tune
motion is, as I said, you can be navigating inside
your project in real-time, move object, play with the material. But at any moment, you can click
on the Path Tracer button, which is located at the top of the viewport. And in just a one click, you can
switch from the real-time navigation to the Path Tracer view. The Path Tracer is a
progressive hardware accelerated rendering
mode that mitigate the disadvantage of real-time
feature with physically correct and compromise-free
global illumination, reflection, and refraction of material and more. As we can see here, we have a
way more accurate representation of the lighting inside our project. If I turn the Path
Tracer off again, we can especially see that on
the right side of the screen where there is no light
coming in from the sun. When you turn the Path
Tracer on, since there is no artificial light placed on
those area, as we can see here, it's fairly dark. The button that we have
at the top of the screen turn on and off the Path Tracer. The shortcut is [INAUDIBLE]. The button next to it
will define the quality. Right now, I'm in low quality. That allowed me to
have a quick preview of what my final image
will give me without taking too much time to render. So it's not perfect. But for my viewport while I'm working
on my project, that's fine for me. At any moment, you can also switch
from medium or high pre-set. That will give you a more accurate
representation of the light and its bounds inside your project. Of course, switching from
low to medium or high will take longer to calculate. As we can see on
screen right now, you have a lot of pixels
happening on screen. It's pretty noisy. But at the end of the
calculation, in true motion, there is an AI denoiser
tool that will completely remove all this grain and
smooth out your final image. Here we can see the progress bar. Let's speed a bit this so
we can see the final result with the high quality pre-set. At the end of the calculation,
there is that denoiser path that comes on top of your image and
that will smooth all your pixels. Let's have a look at
some of the settings. You can find them by clicking on
the ambiance in the scene organizer and switching here to render. Here by default you have
the preset at the top. And if you open the details,
you will find all the settings related to the Path Tracer. Not going to cover this in order,
because the first thing I want to show you is that denoiser option. When you turn that off, you will
see your image with a lot of noise, as we can see over here. If you want to remove the
noise, the first option will be to activate that denoiser. But sometimes it smooth a
bit too much your image. The other alternative
will be just to increase the number of sample per pixel. It will just raise
the rendering time. So it's something to be careful at. Let's click back on the denoiser. The number of samples here set
the number of sample use per pixel for conversions. A higher number of samples reduce
the noise in the rendered image. But again, it'll also
increase the rendering time. The max bounces set the maximum
possible number of light bounce rate should travel before
being terminated. Here the emissive material define
if demissive material actually creates some lights. So here, for example, if
we look at our roof here, we have a glowing material. And we can see on
that part of the roof here that light is
actually bleeding on it. It actually emits light. Let's switch to the quality low. And I'm going to disable this
option to see the difference. So be careful that what is
happening on that ceiling. As we can see here, now
those glowing material doesn't create any physical
light inside the scene. Next we have the anti-aliasing. Lower value will give you a sharper
result, while higher value will smooth a bit all your image. Finally, the firefly slider
control the visibility and exposure of firefly artifact that
you may see in some project. So now that we covered
a bit the settings, one really important
aspect of the Path Tracer can be found in
the preference panel. The shortcut to open it is
Control P. But you can also click on Edit preference. Here we will switch to quality. And here is the viewport
resolution scaling here you can change the
scaling of your viewport. Basically right now
I'm on a 4K monitor. And here my viewport
take a lot of space. That means there is a lot
of pixels to calculate. So when I do a change, for example,
here if I click on environment, let's say right now
I'm using an HDRI. So let's close all of that,
open the HDRI environment. And let's maybe play
with the rotation. When I change an option, it takes a
bit of time to calculate everything. And during that time,
Twinmotion is pretty slow. Also depending on your project,
waiting for the Path Tracer to calculate all the
samples can take some time. If you switch here at the viewport
resolution scaling to a lower value, that will speed up drastically the
calculation inside your viewport. So let's put it to the extreme. And let's switch to 40%. And click on OK. And here as you saw,
it was way faster. But we also saw some really big
artifacts, some really big pixels on screen. It's because we are altering
the number of pixels present inside the viewport just
to have that faster result. Of course, this won't
happen at the final export. And the final export, we will
always have the full quality. This setting is just
happening inside the viewport. This allow to navigate and
work faster inside a project while staying in real-time. So for example, here
at any moment I can decide to navigate inside my scene. And I can stay with the
Path Tracer activated. Obviously, generally I will
pause or stop the Path Tracer when I want to navigate or
when I want to change settings. The shortcut for that
is R on your keyboard. So usually I'm just going to stop it. I'm going to navigate
somewhere in my project, like here, choose the
new point of view. And I'm going to
press R on my keyboard to activate, to enable
again the Path Tracer. Be aware that to be able
to run the Path Tracers, you will need to have a
quite powerful graphics card. It will require
Windows on DirectX 12. And it will also need
to support the EXR. There is a list of the
system requirements available on our
support website that you can find directly on Twinmotion.com. And that's it for the Path Tracer. Thank you everyone for
watching that video. And we'll see you
all for the next one. Bye, everyone.
