(glOrtho left right bottom top near far)

glOrtho describes a transformation that produces a parallel projection.

Note: glOrtho is different in OpenGL and GLES. Why???

Parameter	Description
left	Left clipping plane
right	Right clipping plane
bottom	Bottom clipping plane
top	Top clipping plane
near	Nearer clipping plane
far	Farther clipping plane

Example

Example 1: From modules/ln_glcore/glcore.scm:

(define (glCoreInit)
  (if glCore:needsinit (begin
    (glCoreTextureReset)
    (glClearColor 0. 0. 0. 0.)
    (glMatrixMode GL_PROJECTION)
    (glLoadIdentity)
    (glOrtho 0. (flo app:width) 0. (flo app:height) -1. 1.)
    ;; Many more here
  )))