Reference:Triangular Pattern

	The triangular pattern is a block pattern that generates a repeating pattern of triangles in the x-z plane. In this instance imagine tall rods that are triangular in shape and are parallel to the y-axis and grouped in bundles like shown in the example image. Six separate colors should be specified as follows:
The triangular pattern.

pigment {
  triangular [COLOR_1 [, COLOR_2 [, COLOR_3 [, COLOR_4 [, COLOR_5  [, COLOR_6]]]]]]
  [PATTERN_MODIFIERS...]
  }

Each side of the triangle is one unit long. The triangular rods of color extend infinitely in the +y and -y directions. If no colors are specified then default blue, green, red, magenta, cyan and yellow colors are used.

You may also use pigment statements in place of the colors. For example:

pigment { 
  triangular
  pigment { Aquamarine },
  pigment { Turquoise },
  pigment { Sienna },
  pigment { Aquamarine },
  pigment { Turquoise },
  pigment { SkyBlue }
}

When used with textures, the syntax is...

texture {
  triangular 
  texture{ T_Wood1 },
  texture{ T_Wood2 },
  texture{ T_Wood4 },
  texture{ T_Wood8 },
  texture{ T_Wood16 },
  texture{ T_Wood10 }
}

The triangular pattern has a default color map built in that results in red, blue, cyan, magenta, yellow and green tiles.

This is a block pattern so, use of wave types, color_map, or slope_map modifiers is not allowed.