Marble texture produces a pattern of ''veins'' in the relief.  The veins are perturbed by noise values which adds to the effect.

Parameters :

Position : Position of the texture.

Scale : The texture is scaled by this value.  Use these parameters to scale or stretch the texture in one or more directions.

Twist : This is an adjustment to the noise applied to the veins.  The higher the value here the more tightly "wound" the noise becomes.

Continuity : Higher value here makes the veins more continuous.  Lower values will make the veins more and more fragmented.

Granularity : This parameter controls how "gritty" the veins are.

Layer Spacing : The veins that appear in the relief are cross sections of the layers that make up the texture.  Layer spacing is the nominal distance between layers.

Layer Width : The Layers have a characteristic width or thickness as well as spacing.

Meander : This is a second noise that is applied to the vein pattern.  This is designed to push and pull the vein pattern on a larger scale.  Used with Meander Size to produce effect.

Meander Size : This is the scale of the Meander.  Larger values here cause the effect to be applied to the veins on a larger scale or area.

Dimension : The dimension of the texture is between 1 and 3.  For a 1 dimensional texture, the layers are stacked like pages in a book.  For a 2 dimensional texture the layers are wrapped around a tube.  For a 3 dimensional texture the layers are wrapped like layers of an onion.  The dimension does not have to be a whole number.  For example dimension 2.5 texture the layers are wrapped around an ellipsoid ( egg ) shape.

Notes : A wide range of marble effects can be produced by adjusting the parameters.  No matter what the Dimension parameter is set to the relief will be taking a slice through the layers so a flat relief will give a different result than a rounded relief, and so on.