Graphics Reference
In-Depth Information
Image-Based Grime
The last way that you will look at adding grime-based detail is by using photographic references and apply-
ing them to the image. This can be done directly in modo by using Image Ink. However, for this exercise,
you will work on the UV image in Photoshop. For this method, I will be using grime textures from the DV
Garage Surface Toolkit ( www.dvgarage.com ). This is a really amazing set of grime and grunge maps of
many types and comes in handy for any complex texture work. There are also kits available for adding water
damage and even graffiti.
Export the UV map to an EPS file, as you did when previously working with UVs in Photoshop (choose
Export UVs To EPS from the Texture menu in the menu bar). Then open the EPS file in Photoshop at a
resolution of 2048×2048 and place grunge images in appropriate areas around the scene. You can also use
Photoshop paint tools to add further detail by hand, similarly to the way it was added directly to the model
in the previous example. The results here can be quicker than painting everything by hand and can provide
compelling results. However, having good reference images is crucial to making this work well. The end
result will look something like Figure 12-24 . Notice the photographic quality of the details. This type of
detail can take a long time to accomplish either by hand or by using procedurals.
By using a combination of the methods covered in this section, you will be able to add subtle realism and
life to your rendered images. Obviously, this kind of wear may not be suitable for every render, but when a
project requires a more “lived-in” feel, this is a great way to start.
Figure 12-24: Image-based textures can be used to quickly create realistic wear and grime if you have
good reference imagery.
 
 
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