vertex

<type> vertex(<geometry>geometry, string attribute_name, int linear_vertex_index)

<type>[] vertex(<geometry>geometry, string attribute_name, int linear_vertex_index)

Specifies the vertex using the linear index into the list of all vertices.

<type> vertex(<geometry>geometry, string attribute_name, int prim_num, int vertex_num)

<type>[] vertex(<geometry>geometry, string attribute_name, int prim_num, int vertex_num)

Specifies the vertex as a primitive number and then an offset into the list of vertices on that primitive.

<geometry>

When running in the context of a node (such as a wrangle SOP), this argument can be an integer representing the input number (starting at 0) to read the geometry from.

Alternatively, the argument can be a string specifying a geometry file (for example, a .bgeo) to read from. When running inside Houdini, this can be an op:/path/to/sop reference.

attribute_name

The name of the attribute (or intrinsic) to read.

Returns

The value of the given attribute on the given vertex, or 0 if the attribute or vertex do not exist.