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Surface Shader: Allows you to specify the look of the surface  with a predefined surface shader.

Displacement Shader: Allows you to specify the bumpiness of the surface with a predefined displacement shader.

True Displacement: This toggel allows the selected displacement shader to actually alter the physical shape of the selected surface.

Diffuse: Allows you to specify the diffuse level and color you want the selected surface to have.

Specular: Allows you to specify the specularity level and color you want the selected surface to have.

Roughtness: Allows you to specify the size of specular highlights on the selected surface.

Luminosity: Allows you to specify how much luminosity and color you want the selected surface to have.

Opacity: Allows you to specify how much light will pass through  the selected surface.

Shadows: Allow you to specify how this surface casts shadows.  "None" casts no shadows, regardless of light source.  "Opaque" casts a solid, completely black shadow, regardless of the surface opacity.  "Transparent" casts a solid shadow affected by surface opacity, but not the surface shader.  "Complex" casts a shadow affected by surface opacity and shader.

Apply: Applies the surface shader to the selected surface.

Remove: Removes this material from the selected polygons / patches.

Select: Selects all polygons / patches that have this material applied.