Transforms provide control over the Texture map placement on object surfaces. Most Projection and Generator nodes offer similar controls, but the Transform nodes provide an additional level of control for texture placement. The values in a Transform node are multiplied by the identical values in a Projection or Generator node. You can also use the Transform nodes to control geometry object placement in a scene.
You can access the Transform nodes by right-clicking in the Nodegraph Editor and pointing your mouse to the Transforms menu item (Figure 1).
Figure 1: Accessing the Transforms list in the Nodegraph Editor
Transforms are often paired with a Projection node in order to place a Texture map on an object's surface (Figure 2).
Figure 2: A 2D Transform node paired with a Box projection to orient a Checks texture