Specifies how many vertices should be read when drawing the given this.
Usually this value is set implicitly when associating vertex data or indices with a Primitive .
<note>To be clear; it doesn't refer to the number of vertices - in terms of data - associated with the primitive it's just the number of vertices to read and draw.</note>
| this |
A Primitive object |
| n_vertices |
The number of vertices to read when drawing. |