Creating Complex Natural Materials in Cycles - Blender 2.6 Cycles: Materials and Textures - page 157

4. Add a Texture Coordinate node (press Shift + A and go to Input | Tex-
ture Coordinate ) and a Geometry node (press Shift + A and go to Input
| Geometry ).
5. Connect the Normal output of the Geometry node to the Vector input of
the first Mapping node. Connect the Position output of the Geometry
node to the Vector input of the second Mapping node. Then connect the
UV output of the Texture Coordinate node to the Vector input of the third
Mapping node.
6. In the second Mapping node, change the X location's value to 0.500
and the Y rotation's value to 90° .
7. Connect the output of the first Mapping node to the input of the first
Gradient texture, the output of the second Mapping to the input of the
second Gradient texture, and the output of the third Mapping to both the
Vector inputs of the last two Voronoi texture nodes.
8. Add a ColorRamp node (press Shift + A and go to Convertor | Color-
Ramp ) and connect the Color output of the last Voronoi texture to the
Fac input; set the interpolation to B-Spline . On the ColorRamp node,
click on the little Add button. This adds a new medium gray marker in the
middle of the slider. Change its color to total black and move it to the left,
very close to the first black one.
9. Add a Math node (press Shift + A and go to Convertor | Math ) and set the
operation to Multiply and connect the Color output of the second Gradi-
ent texture node to the first Value input socket of the Math node.
10. Add a Mix node (press Shift + A and go to Color | Mix ), set the Blend
Type to Difference and the Fac value to 1.00 . Connect the Color output
of the first Gradient texture to the Color1 and the Value output of the
Math node to the Color2 input socket.
11. Press Shift + D to duplicate the Mix node, set the Blend Type to Sub-
tract , and connect the ColorRamp color output to both the Color2 and
to the Fac input sockets. Connect the Color output of the first Voronoi
texture to the Color1 input socket.
12. Add a new ColorRamp node, connect the output of the Difference node
to the Fac input, and then move the white marker two-thirds to the left.
13. Duplicate the Mix node, set the Blend Type to Burn , and connect the
color output of the last ColorRamp node to the Color1 input. Connect the
output of the Subtract node to the Color2 input socket, as shown here: