If you are using Normal maps in your workflow, you have to set up a Normal Bump map in the Bump slot. For example, in the image below, the Gamma 2.2-corrected texture bumps the white color more than the black, while the Gamma 1.0 image behaves as expected. Otherwise, the Gamma-corrected tones do not produce the expected result. If you want your Bump or Displacement to be accurate, you need to load your grayscale image with Gamma 1.0. Black is in the original shape of the object and everything lighter than that gets displaced upwards. Just keep in mind that displacement works only in a positive direction. Bump is a fake effect, while Displacement produces actual geometry at render time. Medium gray does nothing, while lighter values go up and darker values go down (relative to the surface normals).įor very strong Bump effect, or for situations where correct shape in the profile of the object is needed, it’s better to use Displacement (either in a material slot or as a V-ray Displacement Modifier). The way this works is very simple: you just add a Map or a Texture to the Bump slot and adjust the strength. Even the smoothest, nicest surface has a bit of imperfection to it. The thing is, nothing is ever completely flat, round, or in any other perfect shape. All objects should have some sort of Bump, even if it’s just a very weak one. Bumpīump is another very important component of a V-Ray Material. Light multiplier allows you to change the strength of the light as it moves inside the object. Zero (0) means that the rays get scattered in all directions one (1) means the rays will continue to move in the same direction before entering the object. Scatter Coefficient changes so the light rays travel within the object. You can reduce the depth of the scattered rays by using the Thickness parameter: Stick to the Hard Wax or Hybrid type (Soft Water is just for legacy V-Ray version compatibility): You can also tint the inside of the material by using the Backface color: To define the inner color, go ahead and Fog Color, just like you would for refractive materials. To define the outer color of the object, use the Diffuse color: Reduce the Refraction Glossiness to something like 0.15~0.5 Make sure that ‘Double Sided’ is turned Off in the Options tab The material needs to be refractive for translucency to work If you do decide to use the Translucency in the regular V-Ray Material, here are a couple of things to remember: Why? It’s a newer, faster interpretation of Subsurface Scattering that is also more adjustable. It is possible to add Translucency to your V-ray Material, but we highly recommend using VrayFastSSS2 material if you need this effect. This week, we’ll be moving on to Bump, but first: a quick tip about… Translucency Last week, we talked about the Refraction tab. The information covered here is generally useful in V-Ray for C4D, but the specific fields and values may be different.
While the example images are from 3ds Max, the same concepts and settings can be used in V-Ray for Maya. We’ll cover the theory behind many of the features of the material and give you specific examples of settings and tricks to use. In this series of Turbo Tips, we’re giving you an in-depth guide to regular V-Ray Material.