gluLookAt
[New
- Windows 95, OEM Service Release 2]
The gluLookAt function defines a viewing
transformation.
void gluLookAt(
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GLdouble eyex, |
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GLdouble eyey, |
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GLdouble eyez, |
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GLdouble centerx,
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GLdouble centery,
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GLdouble centerz,
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GLdouble upx, |
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GLdouble upy, |
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GLdouble upz |
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); |
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Parameters
eyex,
eyey, eyez
The position
of the eye point.
centerx,
centery, centerz
The position
of the reference point.
upx,
upy, upz
The direction
of the up vector.
Remarks
The gluLookAt function creates a viewing matrix
derived from an eye point, a reference point indicating the center of the
scene, and an up vector. The matrix maps the reference point to the negative
z-axis and the eye point to the origin, so that when you use a typical
projection matrix, the center of the scene maps to the center of the viewport.
Similarly, the direction described by the up vector projected onto the viewing
plane is mapped to the positive y-axis so that it points upward in the
viewport. The up vector must not be parallel to the line of sight from the eye
to the reference point.
The matrix generated by gluLookAt
postmultiplies the current matrix.
See Also