??????(Viewing volume)

1
??/????
2
???????

• ????????
• ??????(Viewing volume)
• ??????????????????(?????????)

3
?????

• 1.????
• glOrtho()?gluOrtho2D()???
• ????????????????
• ??????????????????
• ??????????????????????

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glOrtho ????

• void glOrtho(GLdouble left, GLdouble right,
  GLdouble bottom, GLdouble top, GLdouble near,
  GLdouble far)
• ??
• (left,bottom,-near)?(right,top,-near)?????????????
  ????
• (left,bottom,-far)?(right,top,-far)??????????????

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glOrtho
6
(No Transcript)
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????

• 2.????
• glFrustum()?gluPerspective()
• ??????????????????,???????????????????

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gluPerspective

• void gluPerspective
• (GLdouble fovy, GLdouoble aspect, GLdouble near,
  GLdouble far)
• ??
• fovy????, ????0??180????
• aspect?????,(double) w/h
• near????,??????????????????
• far????,??????????????????
• ??near?far????????????????????,???????

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gluPerspective
10
gluPerspective
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glViewport

• glViewport(GLint x, GLint y, GLsizei width,
  GLsizei height)
• ?????????????
• ??
• x,y(x,y)???????????????
• width?height?????????
• ???(0,0,winWidth,winHeight)
• ??winWidth?winHeight???????????,??????????,???????
  ??(???)?

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(x,y)
(50,50)
(x,y)
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width?height
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????
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gluLookAt

• void gluLookAt(eyex,center,Up)
• ?????????
• ?? ?????????????
• ??
• Eyex ???????
• Center???????????
• Up????????????
• (0,1,0) y , (1,0,0) x ,(0,0,1) z

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??

• Surface rendering
• shadows