Working with Textures and Materials - Mastering Blender - page 110

Anotablefeatureofflowinglavaisthatitiscomposedoftwoverydifferentmain“materials.”(Inreality,the
material is the same, but its states are different.) The material consists of the flowing, molten part of the lava,
which is liquid and glows from heat, and the portion of the lava that has been exposed to cold air and hardened,
forming a dark-colored rocky crust. In Blender, it is possible to create these two states separately and then com-
bine them by using nodes. To create this material, follow these steps:
1. Delete the default cube and add a UV sphere with default values (32 segments, 32 rings, 1 radius). Set
it to have an active material called Material.
2. OpenaNodesEditorwindowandchecktheUseNodescheckbox,asyoudidinthepreviousexample.
Thiscreatesanodematerial.Whatyou'relookingataretwonodes:anInputMaterialnodeandanOutput
node. The Output node represents the final appearance that Material will take on. At present, the Input
node is not linked to any material. Click Add New to create a new Material node.
3. Add a second Material node to the node setup. Do this by pressing Shift+A while in the Nodes Editor
window, choosing Input > Material, and then selecting Add New from the highlighted drop-down list on
the node. Rename Material and Material.001 as Rock and Magma , respectively, and rename the main
node material from Material to Lava .
4. Select the Rock Material node and set its material values by using the Material buttons as you would
for any ordinary non-node material, as shown in Figure 2-63 .
5. Add three textures to the Rock material: a very small noise-size clouds texture called rough and two
larger clouds textures, as shown in Figure 2-64 .