Touring the Interface with a Basic Composite - Nuke 101: Professional Compositing and Visual Effects - page 35

Creating a Simple Process Tree
Let'sstartbuildingacompositeinordertobetterunderstandtheprocesstree.Ifyourecall
from Chapter 1 , a tree is a collection of nodes ( FIGURE 2.3 ) connected via pipes.
Figure 2.3. The node's anatomy
The tree flows from the output of one node to the input of the next node. Not all nodes
have all these elements. A Read node, which you will use again in a moment, only has
an output because it is the beginning of the tree and has no use for an input. Some nodes
don't have a Mask input (explained in Chapter 3 ), and some nodes have more than one
input.
You know from Chapter 1 how to read images from disk using a Read node, so let's do
that again and learn a few more options along the way.
1. Launch Nuke.
2. While hovering the mouse pointer over the DAG (the Directed Acyclic Graph,
also called the Node Graph), press the R key.
3. Navigate to the chapters directory, which you selected when you copied the files
from the disc in the introduction. Navigate to the chapter02 directory.
In Chapter 1 you used a File Browser to bring in one sequence, then another File
Browser to bring in another sequence. However, if you select more than one se-
quence, or image, more than one Read node will be created.