in this lesson we'll explore some brand
new production features for GPU
rendering in v-ray next including the
option to use the bucket sampling method
on GPU bucket rendering gives us certain
advantages such as better distributed
rendering while also giving us the
option to use the crypto mat render
element on GPU the crypto mat element is
a method for efficiently encoding
accurate mats so that you can have
fine-tuned control in compositing
without any hassle while taking
advantage of GPU rendering to
demonstrate let's first open up the
v-ray settings and make sure the
production engine is set to via a GPU
next so that we're rendering on GPU next
let's go to the v-ray tab and switch the
sampler type from progressive to the new
bucket mode the default settings here
for the bucket mode are going to work
fine in our case so let's leave them as
they are now in the performance tab
under the v-ray GPU render devices
select drop down you can also select
whether you want to render with a
specific GPU CPU or both
in my case I'm going to use my GPU and
my CPU with hybrid rendering in order to
boost the speed of the render next let's
head over to the render elements tab
where you'll see that we have already
added some of the basic render elements
needed for compositing the beauty pass
we've also added the v-ray denoiser
element which is set on the default URI
denoiser to help us denoise those render
elements now let's add the v-ray crypto
matte render element to the list too if
we scroll down in the crypto mats
properties you'll notice that we have a
few options for the ID type by default
it is set to node name this will create
masks based on the node names but we can
also mask the objects in the scene using
some other ID types as are listed in
this drop down I'm gonna leave this mode
set to node name okay now let's go ahead
and start our render you'll see that
after the light cache finishes its
calculation the buckets appear from the
GPU and CPU to render the image
okay after the render is complete let's
double-check the crypto mat render
element here in the drop-down list as
you can see the crypto mat render
element created masks for all of the
objects in the scene based on their node
names now in order to save all the
render elements we have let's go to the
Save button in the frame buffer hold the
mouse on it and drag it down to see more
options we can save the file as a
multichannel EXR image this way we can
open it in Photoshop and make final
corrections to the different crypto map
masks however in order to open the
multi-channel EXR in Photoshop we will
first need to install a plug-in called
EXR i/o and a script called auto layer
masks you can download both the free
plugin and the script from the EXR i/o
website
okay now in Photoshop let's open the EXR
file using the EXR i/o plugin
as you can see all of the EXR surrender
elements are loaded in without any
hassle
what's imported we can arrange the
render elements into groups so we have a
better overview of the project first
I'll start with the main render elements
by putting them into a group and called
the group to noise elements now you'll
see that the remaining layers are the
crypto mat node name ID elements let's
also put them in a group to which I'll
call crypto mat elements
next I'm going to use the auto layer
mask script which will automatically
apply all crypto mat render elements as
masks to our Beauty shot this will make
the post-production process even easier
to do that we will need to select the
crypto mat elements group and the main
RGB layer then go to file
scripts and click on auto layer masks
all right now that the script finished
applying the crypto map masks to the RGB
layer we can quickly check the newly
created layers from here you can feel
free to modify them using adjustment
layers and tweak the final look of your
image to your satisfaction okay now
you've seen how very next spouts GPU
production features such as bucket
rendering and crypto mat support can
simplify your workflow and give you even
more flexibility and fine-tuned control
in post-production