Codea vertices draw full screen

Question

So I've written a shader that I want to draw across the whole screen of my Codea app, although I have supplied 4 varying vec2's as the vertices table it only draws a triangle. Why is this happening?

Here's my code

board = mesh()
board.shader = shader("Documents:golBoard")

board.vertices = {vec2(0, 0),
    vec2(0, HEIGHT), 
    vec2(WIDTH, HEIGHT),
    vec2(WIDTH, 0)}

And here's what I get..

Answer 1

You can also use:

board:addRect( WIDTH/2, HEIGHT/2, WIDTH, HEIGHT )

This adds the necessary triangles to the mesh to construct the rectangle.

See the docs for more details