Then, go to the Create menu > Materials and select New Node Material option.
New Material node is created. When double-clicked on it, the Node Editor is opened. Now you can work within the Node Editor by creating and adjusting V-Ray nodes.
Column
width
5%
Column
width
57%
...
Section
Column
width
38%
For Cinema 4D version R25 and later
Make sure V-Ray is your Renderer. This is done through Render Settings > Renderer.
Go to the Material Manager and from Create > Materials, select New Node Material. Alternatively, go to Create > V-Ray > V-Ray Node Materials and select a V-Ray surface material from the list.
The Node editor opens and you can now work with all available V-Ray nodes.