Null Material


The Null MaterialThe representation of the surface or volume properties of an object. node is used for mesh objects that have an invisible surface but contain a medium (figure 1). This is equivalent to setting up a specular material with IOR 1 and a reflection of 0 and a transmission of 1. However, that methodology no longer makes sense with nested dielectric. The Null Material was created to make a medium with no surface work in all cases.

Figure 1: The Null Material parameters.


Null Material Parameters

Medium - Accepts any medium node.

Opacity - Controls the transparency of the material via a greyscale texture.

Affect Alpha - If enabled, refractions will affect the alpha channel.

DisplacementThe process of utilizing a 2D texture map to generate 3D surface relief. As opposed to bump and normal mapping, Displacement mapping does not only provide the illusion of depth but it effectively displaces the actual geometric position of points over the textured surface. - Accepts any displacement node to create highly detailed geometry with a low memory footprint.

Smooth - If disabled, normal interpolation will be disabled and triangle meshes will appear faceted.

Smooth Shadow terminator - If enabled, self-intersecting shadow terminator for low polygon is smoothed according to polygon's curvature.

Round Edges - Rounds the geometry edges by using a shading effect, rather than creating additional geometry. See the Round Edges topic in this manual for more information.

Priority - Used to resolve the ambiguity in overlapping surfaces, the surface priority control allows artists to control the order of preference for surfaces. A higher number suggests a higher priority for the surface material, which means it is preferred over a lower priority surface material if a ray enters a higher priority surface and then intersects a lower priority surface while inside the higher priority surface medium