Datasheet

26 Chapter 1: Texturing and Lighting a Product, Part 1
as UV_setup.psd in the ProjectFiles/Project1/Reference folder on the DVD. Proceed to
paint on the lower texture layer. Note that the general color of the texture does not need
to be pure black. Even though the junction is composed of black plastic, you can add
subtle scratches, smudges, or slight color variations (see Figure 1.29).
4. To add additional realism, feel free to cut and paste from photo bitmaps. For example,
the junction geometry includes two cylindrical holes that represent the locations of
screws. Instead of painting screw heads by hand, cut and paste from a photo bitmap of a
screw (you can take the photo yourself or find one through a stock photo or 3D texture
website). To cut and paste, choose File

Open and retrieve the photo bitmap. Switch to
the opened photo bitmap by clicking on the top bar of its window. Using the Lasso tool,
draw a selection marquee around the screw head. Choose Edit

Copy. Switch back to
the texture you started with. Choose Edit

Paste. Press Ctrl+T to reveal the transfor-
mation handle. Interactively scale, position, and rotate the pasted screw head into loca-
tion over a screw hole indicated by the UV snapshot (see Figure 1.29).
5. To create a specific logo on the side of the junction, you can use Photoshop’s Type tool
or cut and paste from a bitmap that already carries text. You can leave the text a solid
color. On the other hand, you can add color variation to make the text appear more
complex. For example, to give the sense that the printed logo uses metallic flake paint,
you can use masking tools to cut a noisy layer into a text-like shape (see Figure 1.30). To
do so, create a new layer and add white text. Again, you can use the Type tool or cut and
paste from a bitmap that already carries text. Create a new layer and paint a pattern that
emulates gold flake paint. If this is too difficult to paint, cut and paste from a photo
that has a similar noisy pattern (for example, glitter or sand). If the photo’s colors are
incorrect, choose Image

Adjustments

Color Balance and fine-tune the red, green,
and blue mixture. After the gold flake paint layer is completed, switch back to the text
layer by clicking on the corresponding layer name in the Layers panel. Using the Magic
Wand tool, click within the white area of one letter. Choose Select

Similar. This selects
all the white text. Choose Select

Inverse. Return to the gold flake paint layer. Choose
Edit

Cut. The gold flake paint is cut out in the shape of the text.
Figure 1.29
(Left) Detail of
color variation
added to the black
representing the
plastic. The contrast
is exaggerated for
print. The actual
texture variation is
more subtle. (Right)
Photo of screw head
pasted twice into
texture, as seen in
Photoshop. A finished
texture is included as
Junction_Color.tga
in the ProjectFiles/
Project1/Textures
folder on the DVD.
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