gluOrtho2D - define a 2D orthographic projection matrix
void gluOrtho2D( | GLfloat | left, |
| GLfloat | right, | |
| GLfloat | bottom, | |
| GLfloat | top); |
left, rightSpecify the coordinates for the left and right vertical clipping planes.
bottom, topSpecify the coordinates for the bottom and top horizontal clipping planes.
gluOrtho2D sets up a two-dimensional orthographic viewing region.
This is equivalent to calling glOrthof with near = -1 and far = 1.
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