Returns the value of a vertex attribute


## Description

It takes 3 arguments.

`point(input_index_or_node_path, attrib_name, point_index)`

- `input_index_or_node_path` is a number or a string
- `attrib_name` is a string, the name of the attribute
- `point_index` index of the point to fetch

## Usage

- `point(0, 'position', 0)` - returns the position of the first point of the first input, as a THREE.Vector3