How to add a material output node? Yesterday I was following a couch making tutorial and when I clicked on "Use Nodes" in the Node Editor there was a node called "Material Output". Today I am trying to achieve the same thing with a sphere, but no "Material Output" node pops up just some "Output" node.  Thanks in advance!
You need to switch the render engine you are using:



The nodes are very different between Cycles and Blender Intrenal materials, so you will notice a lot of incompatibilities if you are in the wrong one.