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!viewpoint¶

`viewpoint`: Hubainisha nafasi ya mtazamo kwa koordinati.¶

Thamani ya chaguo-msingi
x = (xmin + xmax)/2.0,
y = ymin + 1.5 *(ymax – ymin),
z = zmin + 1.5 *(zmax – zmin)

`look_at_point`: Hubainisha nafasi inayoangaliwa.¶

(Thamani ya chaguo-msingi: katikati ya data)

up_direction: Fremu ya mwonekano hubainishwa na Viewpoint, look_at_point na up_direction.
              chaguo-msingi : 0.0 0.0 1.0

Fremu ya koordinati za mwonekano:
              Asili    : look_at_point
              mhimili z     : viewpoint - look_at_point
              mhimili x     : up × mhimili z
              mhimili y     : mhimili z × mhimili x

Mbinu ya kubainisha fremu ya mwonekano

Kielelezo 7.4.11　Mbinu ya kubainisha fremu ya mwonekano

Mfano wa mipangilio ya !viewpoint, !look_at_point na up_direction

Kielelezo 7.4.12 Mfano wa mipangilio ya !viewpoint, !look_at_point na up_direction

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