2009

Table Of Contents
Textures can be applied to a shading material to enhance the realism of
the final image. For example, logo graphics, bumps, and so on, can be
added to enhance the detail on the surface.
Textures can be 2D or 3D in nature. Each has its unique techniques for
application and placement.
Placement of textures
When you put the Mayakist logo on the surface, the letters appeared straight.
The letters are actually skewed in the texture. We skewed the logo for your
use in this lesson so that it looks straight when stretched onto the surface.
In your own work, skewing texture images is usually too difficult and
impractical. A more practical Maya technique for assigning and positioning
file textures is to use texture projection. With this feature, you project the
texture onto the surface as if you are projecting a slide image onto a screen.
The texture is positioned where the projection strikes the surface. Instead of
a skewed Mayakist logo, you could use a straight logo and project it onto the
sphere. You could tune the angle of projection so that the curvature of the
surface skews the logo just as in the lesson. To assign textures as projections,
you turn on the As Projection option at the top of the 2D Textures section of
the Create Render Node window.
The placement of texture projections is similar to the placement you performed
for the bump map (3D) texture. Like the bump map texture, you need to
parent the texture projection (the place3dTexture node) to the object in order
to avoid the texture placement changing when the object moves.
Layered textures
Suppose you want to add a scarred pattern to the orange skin. Because you
can only have one texture assigned to the Color attribute you can use a Layered
Texture to combine two or more texture maps.
The Layered Texture is a texture node that lets you composite or layer several
textures on top of each other. You assign it to a materials attribute just like
other textures. Within the Layered Textures attribute controls, you can connect
422 | Chapter 9 Rendering