Graphics Programs Reference
In-Depth Information
Creating the stencil material
At this point, both the materials are assigned to the
Mountain
object, but if you
render the preview now, they will show everywhere on the mesh mixed at 50 percent.
We must build a separator to decide where the surface must show only the rock and
where only the snow:
1. Add a
Geometry
node (press
Shift
+
A
and go to
Input
|
Geometry
), a
Mapping
node (press
Shift
+
A
and go to
Vector
|
Mapping
), a
Gradient
Texture
node (press
Shift
+
A
and go to
Texture
|
Gradient Texture
), a
Mix
node (press
Shift
+
A
and go to
Color
|
Mix
), and a
ColorRamp
node
(press
Shift
+
A
and go to
Convertor
|
ColorRamp
).
2. Connect the
Normal
output of the
Geometry
node to the
Vector
input of
the
Mapping
node, and then connect the
Mapping
node to the
Gradient
texture. Connect the
Color
output of the texture to the
Color1
input sock-
et of the
Mix
node and the
Color
output of this latter to the
Fac
input of
the
ColorRamp
node.
3. Set the
ColorRamp
interpolation to
B-Spline
and move the black color
marker to the middle of the slider. Move the white color marker to the left
two-third of the remaining half of the slider. Click on the
Add
button to
create a new marker in between them and change its color to pure black.
4. Set the
Mix
node
Blend Type
to
Add
. Go to the
Mapping
node and set
Y Rotation
to
90°
.
