To disable or remove a procedural map
from a material
Click Tools menu; Palettes; Materials.
In the Materials window, in the Available Materials in Drawing
panel, select a material swatch or create one by select the Create
a New Material button.
Select the Realistic material type.
Select Diffuse Map and select a procedural map as the Map type
(Checker, Marble, Noise, Speckle, Tile, Waves or Wood).
Select the drop down arrow in the Nested
Map Navigation. The Diffuse and the procedural
map name are displayed. Example: Diffuse : Checker.
Clear the Diffuse Map check box.
Select the drop down arrow in the Nested Map Navigation panel.
The Diffuse and the procedural map name are greyed out and
disabled.
Select the Diffuse Map check box.
Select the drop down arrow in the Nested Map Navigation panel.
The Diffuse and procedural map name are enabled.
In the Diffuse Map channel panel, click the Delete Map
Information from Material button to delete the Texture Map assigned
to the material. It is an icon with the red x.
Select the drop down arrow in the Nested Map Navigation panel.
The procedural map name is no longer displayed in the navigation
list.
Toolbar: Render 
