How to create a dirty tire material in KeyShot 6

Tire model: KeyShot Tutorial: How to create a dirty tire material. In this KeyShot tutorial I'll walk you through the process of creating the look of a dirty tire. I’ll be creating a base rubber material and add a dirt material on top of that. I’ll show how to use the color composite node to blend a color gradient together with a bitmap texture to use as an opacity map for the dirt overlay. 0:30 : Create the base rubber material 2:05 : Create the dirt material 3:47 :