wood pattern consists of concentric cylinders centered on the z-axis. When appropriately colored,
the bands look like the growth rings and veins in real wood. Small amounts of turbulence should be added to make it
look more realistic. By default, wood has no turbulence.
Unlike most patterns, the
wood pattern uses the
triangle_wave wave type by default. This
means that like marble, wood uses color map values 0.0 to 1.0 then repeats the colors in reverse order from 1.0 to
0.0. However you may use any wave type.
wood pattern has a default color_map built in that results in a light and dark brown pattern with