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This render element is enabled through the Render Elements tab of the Render Setup window in 3ds Max and displays its parameters in a rollout at the bottom of the window:

VRayVFB – Enables the render element inside the V-Ray Frame Buffer.

Deep output – Specifies whether to include this render element in deep images.

Type – Controls the type of render element produced by VRaySamplerInfo:

Point – The X, Y, and Z coordinates of the point are converted to RGB data according to the Coord system that is set. This outputs a Position Pass for use in compositing.
Normal vector – The direction of the normal at the particular shaded point according to which Coord system is set.
Reflection vector – Commonly used for adjusting reflections in the composite.
Refraction vector – Commonly used for adjusting refractions in the composite.
UVW coordinates – Extracts the UVW coordinates of the object at the particular shaded point.  This can be used to apply another texture at a composite level.
Normal vector with bump mapping – Produces the bump normal according to the Coord system that is set.
Backward occlusion – The red and green components of this render element represent the screen position of the shaded point at the beginning of the motion-blurred frame, while the blue component represents camera occlusion at the beginning of the motion-blurred frame. Together with the Forward occlusion render element, this can be used for denoising and/or post-process motion blur.
Forward occlusion – The red and green components of this render element represent the screen position of the shaded point at the end of the motion-blurred frame, while the blue component represents camera occlusion at the end of the motion-blurred frame. Together with the Backward occlusion render element, this can be used for denoising and/or post-process motion blur.
Integer ID from node user attribute – Extracts any integer node user property into an integer render element. Can be used as an extended Object ID.
Float number from node user attribute – Extracts any floating-point node user property into a single-channel floating-point render element. Can be used to extract additional masks.
Tangent vector in object space –  Displays tangent vector according to the Object space.
Bitangent vector in object space – Displays bitangent vector according to the Object space.

Point multiplier – Acts as a multiplier when Type is set to Point.

Refract IOR – Sets the index of refraction when Refraction vector is set as the Type.

UVW channel – The UVW mapping channel used when the Type is set to UVW coordinates.

UVW mode – Specifies what happens to UVW values outside the 0.0-1.0 range of the unit texture square:

Normal – Stores the UVW coordinates without modification.
Clamp – UVW coordinates above 1.0 are clamped to 1.0, and values below 0.0 are clamped to 0.0.
Tile – Wraps the UVW coordinates to the unit texture square.

  Coord system – Controls the coordinate system used:

World – X, Y, and Z coordinates (in world space) of the point are converted to RGB data.
Object – X, Y, and Z coordinates (in object space) of the point are converted to RGB data.
Camera – X, Y, and Z coordinates (in camera space) of the point are converted to RGB data.
Relative – X, Y, and Z coordinates in the object space of the Relative node are converted to RGB data.

Relative node – When Coord system is set to Relative, this specifies the scene node relative to which the point/vector data is stored.

Output – Controls the way data is stored in the render element when the type is a normal vector, or a reflection/refraction direction:

Vector (signed) – Values are stored directly without modification, including negative components.
Color (unsigned) – Values are scaled down by 0.5 and offset by 0.5 so that (0, 0, 0) maps to (0.5, 0.5, 0.5), (-1, -1, -1) maps to (0, 0, 0) and (1,1,1) maps to (1,1,1). This avoids negative values which might be necessary for some compositing packages.

User attribute – Determines which user attribute to connect to when Integer ID from node user attribute or Float number from node user attribute are selected as Тype.

Occlusion bias – Controls the positional bias of the Backward occlusion & Forward occlusion types in order to prevent incorrect self-occlusion.

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Sampler Info Render Element with type set to Point (relative space)