About using drawTriangles()

Another advanced method in OpenFL, Graphics.drawTriangles(), is like the Graphics.drawPath() method. The Graphics.drawTriangles() method also uses a Vector object to specify point locations for drawing a path.

However, the real purpose for the Graphics.drawTriangles() method is to facilitate three-dimensional effects through OpenFL.

OpenFL supports 3D using Stage3D, as well as the OpenGLView object. These are recommended over drawTriangles() for 3D