Vray Bump Material can be used to layer bump/normal map over Vray material in an efficient manner. It can be used to create complex materials. Vray Bump Material takes a base material and applies bump/normal map material (coatings) on top of it. 

Basic Properties

Name – here you can enter a name for the object.

Layer – If an element was assigned to a layer its layer color will be displayed here. This field reflects the layer color in the Layer Palette. You can drag & drop layers from the Layer Browser or similar layer fields onto this field. You can also assign layers or remove elements from current layers using the menus located behind the small triangle.

Preview Quality – quality of material preview in preview window.

Map Preview Size – Here you’ll find entries from 64×64 (16 KB) to 4096×4096 (64 MB). The value controls the internal resolution of the map — the higher you set this value, the more detailed the map will be in the Viewport. The value has no effect on the rendered result.Proceed with caution when increasing the Map Preview Size. Higher settings require more RAM and increase the file size of the CINEMA 4D scene. OpenGL is also affected because the map previews must be loaded into the graphics card’s memory.

Overridable – when you use Override material options in Global options, you can specify some materials that will no be override, like glasses, curtains etc..it useful for preview vizualization of interiors.

Round Edges – edges of object with this material will be rounded.

Parameters

Base Material – the base material over which bump/normal map material are layered.

Map Type – here you can define type of texture map file, simple image texture or normal map in different space.

Bump Texture – here an image texture or shader can be defined.

Invert – This option simply inverts the Texture Map, so bump is reversed.

Bump amount – the amount of bump. A value of 0.0 means the object will appear unchanged. Higher values produce a greater bump effect. Intensity of the bump is sets in really world units, thous units are taken from the c4d units of the file, if you change the units there also the bump size changes accordingly. Bump amount value can`t be negative.

Bump Delta Scale – this parameter allows you to control the softness/sharpness of the bump effect. Higher values generate sharper transitions in the bump effect while lower values generate softer looking bump effect.

Assignment

In this box, you’ll find a list of all objects in the scene that use the selected material. Using the context menu, you can carry out commands on these objects that relate to the selected material. To open the context menu, right-click (Windows) or Command-click (Mac OS) on an object’s name in the list.