So, is GPU rendering just for preview?
Or can you use it as a full production renderer?
With the new V-Ray 3.5, you most certainly can.
Today we're gonna take a take a look, at all the new GPU features of V-Ray 3.5.
That's coming up!
Hello YouTube, I'm Kevin The Dane – and today, we're finishing up on the new V-Ray
3.5 reviews.
Today is gonna be all about the new GPU features.
So let's lay 'em out there: Most importantly, for me at least, is the
low GPU thread priority – this means I can actually use my compåuter, while I'm rendering.
Because I only have one GPU in my machine.
Then we have support for some of the new features: The adaptive lighting algorith, and the interactive
lens effects.
I talk a lot more about these in last weeks episode, so there will be a link somewhere
here, and in the description below.
Then we have support for some of the older features:
Render masks, cashed irrandiance maps, directional lighting, the V-Ray clipper plane and aerial
perspective, that were introduced in V-Ray 3.3.
Then we have some added shader support.
We have support for the Stochastic Flakes, that were introduced in V-Ray 3.4.
We have support for the Matte Shadow Catcher.
And we have support for the V-Ray Color2bump and we have some Forest Shader support, for
people using iToo's Forest Pack.
With improved algorithms and On-Demand Mip-Mapping, GPU rendering has also become a lot less memory
heavy.
And finally they have added support for more render elements.
So, it looks like V-Ray RT is finally production ready, so let's have a look at some of the
new features.
But first, let me explain how to setup your scene for GPU rendering.
First off, you need to have a fairly decent graphics card.
Preferably, an nVidia card, that will allow you to use the faster CUDA framework, but
most AMD cards are supported as well, through the OpenCL framework.
Lets open up a scene.
Any old scene you have will do just fine.
I'm gonna open up this iPod shuffle scene.
Open up the render settings window by pressing F10.
Now, before V-Ray 3.5, you'd might switch to Active Shade, to be able to use the GPU
renderer in Real Time, and still make changes to the scene.
But with the new interactive production renderer, we don't need to do that.
So just leave it at production rendering.
Then simply switch you renderer to V-Ray RT and go to the RT tab.
Now, you might wanna change a few settings before rendering.
First of all you wanna choose a framework.
We don't want the RT to run on the CPU, so chose CUDA if you have a supported nVidia
card.
Otherwise you choose OpenCL.
I'm gonna go with CUDA.
For me, I also wanna switch on the Low GPU Thread Priority.
Or else I won't be able to record while rendering.
If you have multiple GPUs in your machine, you can go to the next rollout and untick
one of them, to leave some GPU power for other processes such as 3ds Max.. or Netflix.
I'll just leave this on, since I only have same one.
Just like with the regular renderer you can set a max time on your render.
This might be useful for rendering a preview of an animation, or if you are on a tight
deadline, or if you simply want the render to be as clean as possible, in 8 hours when
you get home from work.
If you are not using the time based approach, you will control the render quality with the
noise threshold parameter.
0.005 is production quality.
And if you plan to use the denoiser you can easily go a lot higher, say fx. 0.05.
Then just add a V-Ray denoiser elements and we're ready to go.
Open up the frame buffer and hit "interactive rendering", and your scene should render.
Now, I've experienced, that sometimes it renders far slower than expected . Just stop
the render, hit the normal render button.
Stop it again, and hit interactive – that should do the trick.
You can see here, that the image looks a bit weird.
That's because the denoiser already was applied, and is now waiting to update again.
You can manually update, by clicking here – and we have a much nicer result.
But let's just disable it for now, so we don't have to worry about updating them.
Now, let's test a few of the new features: See, I have this rim-light out here, but it's
kind of all over the place, making my image look flat.
So with the light directionality, I can tune it in to illuminate only the iPod.
Then of course I need to turn down the intensity as well.
And we have amuch nice looking image.
Another cool feature is in the framebuffer itself.
To test it, we need to activate DoF on our camera.
Go to camera, and enable DoF.
Now back to the framebuffer.
To change the focus, simply rightclick on a spot and choose set focus distance.
Now you can just click anywhere and the camera will refocus.
A couple of other new features are hiding in here as well.
You can select an object directly in the framebuffer, or even select its material, and it opens
up in the material editor.
Another new feature is the ability to render with a Matte Shadow Catcher.
And Chaos Group have even added it to the V-Ray toolbar, so all we have to do is click
this button, et voila, we have a shadow catcher.
But, this doesn't work in interactive mode, so we need to stop this.
And let's just activate the DeNoiser again and hit render.
There we have it, an image with an alpha channel.
Now just save this out as a PNG, and you can composite it on top of some other graphics.
Now, a quick note here: Apparently the alpha channel here wasn't sampled very well.
This surely must be a mistake.
I'll have to ask around to get an answer – but if you render the same scene on the
CPU, you alpha channel will look a lot cleaner.
I have a couple of more scenes with some stuff I wanna show you.
First of all I wanna show you the stochastic flakes material.
That is an excellent new shader for creating snow, car paints, and what not.
It was introduced in vray 3.4 and is now also available for the GPU renderer.
So let's open up the material editor and have a look.
I have here a vray blend material, that consists of a base color and 2 flake materials and
a polish on top.
The flake materials are put together, so that you chose how many flakes you want, and then
you control the scale of the flakes.
This will depend on your mapping.
You can use custom UV mapping, or as I do her, an automated triplaner map based on object
XYZ.
Then you set your glossiness, and that controls, at which angle to a lightsource, that you
flakes will be visible.
And together with the blur value controls the look of the flakes.
Then I have another flake material, with some slightly different settings.
And on top of it all, I have a third flake material.
But one this one disabled the flades.
That means that there will be no flakes, just an added layer of glossiness on top of the
other materials.
The blend material is an additive material, which is one of the features that is now also
supported by V-Ray RT.
So let's try to render it out, and see how it looks.
Let me just check the settings here.
Everything is fine, so lets hit render.
And let's just stop it, and render interactively instead, cause I wanna show you another cool
feature.
It's not a new feature, but it is a great feature of V-Ray RT, so I'll include it
anyway.
The ability to zoom in, just like with 2D pan zoom in the viewports.
Right click and click real zoom.
Then you can just zoom in on a specific part of your image, and you'll be able to get
a nice upscaled view of what this will look like, once you render it in a higher resolution.
Now, for the next cool feature, the Aerial Perspective, I'll need yet a scene with
some depth.
So let's jump over here.
This is a scene I made last year.
It is just a plane, with an image, and then I have subdivided it and resculped the plane.
You can see I have a ridge here, and one here.
And they are both moved closer to the camera over here, in the cameras Z-direction, so
that when I switch to the camera, the image looks totally fine and undistorted.
This is a technique called projection mapping, and the purpose of this is to give a slight
parallax in the image, when I move the camera around.
Now, lets try to render this.
You can see that it is not a very pretty image.
So let's just stop that, and go to "rendering", "environment" (that is also on your hotkey
"8").
Let's go down here to the effects tab.
Press add.
Aerial Perspective.
Visibility range, that's 3000.
Atmosphere height, that's.. hmm.
Let's just leave it at 6000.
We want to effect the environment.
Aaand we'll chose a blue-ish color.
Something like that.
Now, let's close this down, and re-render with the Aerial Perspective effect enabled.
And now you'll see that we get a fog effect here, and the parts of the mountain that are
furthest away, they are covered the most by the fog.
Maybe I tinted this juuust a little bit to blue – but I think you get the idea, that
you can add some serious realism to your scenes with this aerial perspective effect.
And now you can render this effect with the GPU as well.
If you are curious about any of these features, old or new, , there's a poll up here in
the info bar.
So let me know what kind of tutorials you'd like to see from me.
Something, that I'd like to see next from ChaosGroup, are tooltips in the V-Ray RT tab.
Of course, you can always just go look it up in the documentation, but tooltips are
a lot more convenient.
What would you guys like to see next from Chaos Group?
Let me know in the comments below, and as always, don't forget to like, subcribe,
share, tweet, whatever floats your boat.
Aaand, cut!
V-Ray 3.5, take one.
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