语法：

vertex_format_add_position_3d();

返回：

N/A（无返回值）

描述

Tell GameMaker Studio 2 to accept 3D positional data (x, y and z) as part of the new vertex format being created.

例如：

vertex_format_begin();
vertex_format_add_colour();
vertex_format_add_position_3d();
my_format = vertex_format_end();

The above code will create a new vertex format with just colour and position values and then store the format id in the variable "my_format".