To create a new material, add a material to a project and modify it as needed:
Click Render tab > System panel > Autodesk Rendering to display the dialog:
On the Materials tab, browse the Autodesk Library and click to select a material type.
Hover over the material you want to use, and click at the end of the row to add the material to the project and display it in the Material Editor:
Alternatively, if you already have a similar material in the project:
On the Appearance tab, specify the material properties and color options.
Click the Information tab and enter a name, description, and keywords to describe the material.