Join Dariush Derakhshani for an in-depth discussion in this video The V-Ray Car Paint material, part of Learning V-Ray for Maya.
In this video, we'll be taking a look at VRay's car paint shader. In this scene, we have a Ford car set up. We have a Render Settings with GI on with a Brute Force on a light cache. And I'm reading a pre-baked out light cache to make things a little bit faster. We have our reasonable settings with the minimum and the maximum subdivisions. And right now, the car has a regular my material on it that has a little bit of reflective and a fennel turned on and that gives us a render that looks like this Now to create the car paint shader, you go into the Hypershade and you simply click on car paint shader.
Now the there's a few components of the car paint shader that you should be aware of. One of them is the flake parameters. Here you can have a nice Glossy flake within your car paint. Part of the layering of the base and the reflections and the flakes, makes for a really very convincing shanner. Go ahead and select all the parts of the car, and apply them to the default car paint, and let's have a render and take a look.
Now, you can see I've got Distributor Rendering turned on which means I have a secondary system, an HP Z220 furnished by HP with a Xeon processor in it will chew up Through all these buckets very, very quickly. And the secondary system gives me 8 more cores to render on which is quite nice. Especially, when you're rendering something like a car. The car paint shanner and the amount of lighting and GI. that You should be using for a car will make things a little bit slower so we're having the extra power from the HP Z220 is really quite helpful.
And as we start seeing some of the buckets start to complete, you'll see that the nice light silver blue is giving some very nice detailed reflections in the fresnel from the environment, which is almost always what you want to rely on for a car rendering. You want to have a gorgeous environment that gives you lots of nice light play, to give you some beautiful contours and really Model the shapes of the car.
Now, you’ll also start noticing some of these little purple blotches and little triangular spots. This is from the default flake, which is not quite set, right? With the flakes being too far apart, and far too large. Let’s go ahead and wait for the full render to finish. And now, with the render completed, we can see a lot of these flakes are streaking and not looking so great.
However, the reflections in the car, if we compare them to the regular VRay material, we see a lot more detail and a lot more fresnel effect happening. Which gives us a better idea of the clear coat that's on the car. The major points on the car paint to look at, would be the flake density and the flake size and scale. Right now, the size is quite large so if we reduce the size. And increase the density, we'll have a better flake distribution across. Now, I've made a pre-made car paint shader.
We're going to select all of our car geometry pieces and attach them to this shader. This has a flake glossiness of point 9. Quite a large flake density. A small flake size and a flake scale. The flake map size gives you more detail in your flakes. However, the higher you go, the more it will cost to render. Now, the Flake Glossiness, you don't want to set higher than point nine, as that may create some artifacting.
And a flake density of zero will create a shader that has no flakes in it whatsoever. Giving you a clean car paint without any flakes. The flake filtering mode currently set to simple, which averages the flake orientation. It's less accurate than the directional filtering, but uses less RAM and it, it's a little bit faster to render. Using simple filtering mode may change the look of your flakes when the car is looked at from a distance.
These settings give us a render that looks like this. We have some flakes that glisten off of the fresnel, off of the edge. We have a beautiful reflection off the back because of the clear coat, which is under the coat parameters. The coat strength is the strength of the reflections in the coat when you're looking at the car's surface directly straight on, meaning surfaces that are facing you will have a stronger reflection the higher the strength. For example, with a high coach strength will get a lot of reflections. We'll go ahead and take a look at this part of the car. As the buckets begin to complete we can see a highly undesirable effect where the car is beginning to look like solid chrome.
This defeats the purpose of the car paint in many ways, because we want the glancing angles, the fresnel of the reflections to come up. So the coach strength should be usually at a pretty low number. We'll go ahead and kill this render and set this back to its default of 0.05. You can increase this a little bit to get a little bit more plainer reflections but you don't want to go too much higher. The coat glossiness is of course the glossiness of the reflection, in the coat. You could go a little bit lower but you start loosing the, juicy qualities of the clear coat, in the car.
We'll go ahead and reduce ours just a little bit here, and we'll give a shot, at this location, and see what it looks like. And as the last of the distributed buckets begin to complete, you can see that the, the car becomes more of a matte finish, more of a satin finish. Which, if you have a satin finish car paint. You can achieve by reducing the Coat Glossiness, lets go head and set this back up to 1. Those are pretty much the parameters for the car paint shader of course, you've got your base color, the amount of reflection in your base beneath the coat. This is one way you can get a little bit more satin feel as well, with the amount of reflection and its gloss.
You're going to want the base to be less glossy than the coat to achieve the, the nicer look that we had from before. Which is coming up right now. Finally, you've got the ability to add a bump to the base, as well as to the coat. So, you can have the same matte coming in to create a bump, or you can have different mattes to create a different effect. In this video, we take a look at view race car paint shader, to see how different parameters work to produce a nice beautiful car render.
- What is V-Ray?
- V-Ray integration with Maya UI
- V-Ray lights and shaders
- Working with global illumination
- Object properties and render layers
- Creating passes and elements
- Rendering and optimizing