Dirt is meant to simulate the addition of material to the surface on the cavities of the object and/or its edges as well. That is why there are inside and edge dirt mixable inputs later on, which depend on their value to appear.

Smart Weathering Doc - Dirt Inside Dirt 1,000 - V2.0.0.png

Table of content


Main value that enables or disables the different dirt sub-parameters.

<aside> 📌 Important The “Inside Dirt” effect is also affected by surrounding objects and not only by the shape of the object itself*. The closer the surrounding objects are, the more intense is the effect. This is due to the implementation of Ambient Occlusion. Consider this for objects like floors and walls. In the images that you can see, as the Fire hydrant is near a floor, the “Inside Dirt” gets more influence and therefore boosted.

This behavior can be used in your favor to place dirt in certain spots, still without the need of using UVs or baking. Check our video tutorials, to better see how to do it.*



From left to right, values were: 0.000 | 0.600 | 1.000. The rest of the parameters were left as default.

Min = 0 | means is absent inside and edge dirt

Max = 1  | means is full inside and edge dirt

Interpolation | between 0-1  is a linear opacity transition

Default = 0