The Dirt Texture can be used to create different shading effects based on ambient occlusion calculations. This texture is useful for simulating dirt, dust, or wear and tear, as well as for blending textures based on the recesses of a surface. You can use it for many scenarios.
how to use: sImple and advanced
You can use the Dirt in many situations and in many ways. So it is not easy to explain. Here we show you two examples of use: simple and advanced. Node setup is simple as you would expect from a simple one. Advanced has a complex node setup. We will talk a bit about this setup later.
The sImplest usage
Open the Node editor and prepare the setup as you see in the picture below. Cerate two different materials and one Octane mix material. Connect two materials into the mix material slots respectively. For the amount channel create dirt node and change the settings. This is the simplest use of "Dirt Texture" node.
This is a complicated setup you can see in the picture. We will not be able to go into the details, but if you look carefully, "Dirt" is used in 2 places. For both local and global influence. 2 separate material setups were merged using Mix Material and Dirt was added to the amount channel again. The "Noise" node is used to reduce the pattern of dirt textures. Other image textures are to mix the old and worn image of the robot with dirt. Do not worry after seeing this setup. In fact, you will always be doing these types of setups as you experience texture and material creation. In the meantime, let's not forget that if we had done this setup in Cinema 4d's classic material manager, we would have lost a lot of time. In many places we would have to go back and forth between windows, change settings and do a lot of tedious work. Here is the node editor's beauty comes into play here.
DIRT TEXTURE SETTINGS
This setting controls the intensity of the dirt effect across the surface of the geometry.
This setting controls the intensity of details revealed in the dirt texture. You can better observe this effect if your object in the scene has detailed and sharp edges.
This setting controls the spread of the dirt across the surface from the recessed parts of the model outward towards the more exposed parts of the model. Also you can increase the dirt effects accross your geometry. More radius the more dirt will be.
This setting can be used to reduce the appearance of black edges on roughly tessellated meshes.
This is a toggle which reverses the effect of the Dirt texture based on the normal direction of the surface.