Graphics Reference
In-Depth Information
Now there is one last thing that can help add some extra polish to the look of the image, and that is grime.
So I guess it is the opposite of polish, really, but it will help to complete the scene. You can add the well-
worn look to textures and images in various ways: with procedural texturing, by hand, or using photographic
references.
Procedural Grime
Creating grime with procedural textures can be quick and adaptable:
1.
To make the initial setup easier, create a new material in the Shader Tree and place it at the top, just
under the Base Shader. This will make the scene all white with lighting only and provide a base for
adding the details. After the work is complete, the material can be hidden or deleted, and the grunge
will sit on top of the rest of the materials. This will be the common setup for all of the detail texture
editing.
2.
Now, start by adding another Ambient Occlusion layer. Set the Occlusion Distance to a high number.
Somewhere around 10 m will make a good starting point. Adjust the Variance and Variance Scale to
suit your needs.
Figure 12-19
shows the values set to 40% and 2 m.
This can be adequate in certain situations, but a bit more detail can help make this solution work.
3.
For the moment, hide the Occlusion layer and add a Dirt procedural texture. This will cover the
entire scene and be far too busy for these purposes.
Figure 12-19:
Ambient Occlusion can help add wear to the textures in the scene.
