       SippShaderMarble ambient specular c3 scale basecolor stripcolor [opacity]
              This shader creates a simulated marble texture on a
              surface.  It uses two colors, one as the base mate-
              rial  and  one  as  the  interspersed material. The
              interspersed material is put into the base material
              in strips that are distorted using noise() and tur-
              bulence().

              ambient is a value between 0.0 and 1.0 which deter-
              mines  how much of the base color of a surface that
              is visible when it is not illuminated by any  light
              source.

              specular  is  a  value between 0.0 and 1.0 which is
              the fraction of color specularly reflected.

              c3 is the shininess of the surface where 0.0 is the
              most shiny and 1.0 is the most dull.

              scale  is a factor which determines the size of the
              marble pattern depending on the size of the texture
              coordinate  system in relation to the world coordi-
              nate system.

              basecolor is a list containing the red,  green  and
              blue  values  for  the base material.  Each being a
              number between 0.0 and 1.0.

              stripcolor is a list containing the red, green  and
              blue values for the interspersed material.

              opacity  describes  the  opacity  of a surface. 0.0
              means  totally  transparent,  1.0   means   totally
              opaque.  May be a list of red, green and blue opac-
              ity values or a single value to  be  used  for  all
              color channels.  Optional, default is 1.0.
