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gluOrtho2D - 2 ?????????ͱƹ?????????????

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void gluOrtho2D( GLdouble left,

	GLdouble right,
	GLdouble bottom,
	GLdouble top )

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left, right

???Ⱥ??ο?ľ?????åԥ???ʿ?̤κ?ɸ?????????롣

bottom, top

???????????ο?ʿ?????åԥ???ʿ?̤κ?ɸ?????????롣

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gluOrtho2D ?? 2 ?????????ͱƤ??Ԥ??????ӥ塼???????ΰ??????ꤹ?롣 $\mathrm{near}=-1$ and $\mathrm{far}=1$ . gluOrtho2D ?ϡ??????? $\mathrm{near}=-1$ ?? $\mathrm{far}=1$ ?????? ???? glOrtho ???ƤӽФ????Ȥ?Ʊ???Ǥ??롣

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glOrtho, gluPerspective