Graphics Programs Reference
In-Depth Information
Figure 18.18
this example is that the rule of connecting like-colored sockets has been
broken: the blue “Global” socket on the geometry node is connected to
the yellow “Image” socket on the separate RGB node.
“Separate RGB” tells Blender to separate the red, green, and blue val-
ues; it is being used to separate the coordinates that are vector values.
RGB in this case represents x,y,z coordinate values that are fed to the
“Alpha” value in the extended material node. “B” corresponds to the z
value, or the vertical coordinate. Therefore, we are applying the material
to a vertical cube column. The value is fed into the “Alpha” socket on the
extended material node, which is the value that controls transparency.
“Geometry” - “Global” is telling Blender to use global coordinates. The
combination is telling Blender to apply the diffuse color and the trans-
parency to the elongated cube on the z -axis.
We have ray tracing applied and we have given the elongated cube the characteristics
of glass. The cube is therefore refracting the light reflected from the backdrop in the scene
Figure 18.19
 
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