The Sampler Info node is a Maya utility node that provides various scene information. V-Ray Extra Attributes can be applied to the node to increase the node's output options. For more information, see the Additional Outputs section of the Texture Attributes page.
The Sampler Info node is a color image that provides information about the scene, with the choice to show any of various aspects as color blocks. This provides information about various aspects of the shaded points such as position, normal, bump normal, reflection/refraction vectors and UVW coordinates. It can be used either for world position passes or normal passes. It also extracts information about the scene, converting the gathered information into RGB data for use in compositing.
UI Path: ||Select Sampler Info node|| > Attribute Editor > Attributes menu > VRay > Additional outputs
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Normal Obj – Specifies the smooth normal in object space.
Normal World – Specifies the smooth normal in world space.
Geom Normal World – Specifies the geometric normal in world space.
Point World Reference – Specifies the shading point in reference space.
Normal World Reference – Specifies the bump normal in relative space.
Bump Normal World – Specifies the bump normal in world space.
Bump Normal Camera – Specifies the bump normal in camera space.
Bump Normal Object – Specifies the bump normal in object space.
Ray Depth – Specifies the ray length.
Path Length – Specifies the path length.
Surface Material ID – Specifies the material ID if the surface supports it.
Object ID – Specifies the object ID of the hit object.
Parent Object ID – Specifies the object ID of the parent object.
Velocity World – Specifies the velocity at the intersection point in scene units per frame (in world space).
Speed – Specifies the speed at the intersection point in scene units per frame.
Random by ID – Assigns a random color/texture by each object's ID.
Random by Polly Shell – Assigns a random color/texture based on the polygon shell the current face belongs to.
Random by scene name – Assigns a random color/texture by each object's full scene path.
