gluLookAt

The gluLookAt function defines a viewing transformation.

void gluLookAt(
  GLdouble eyex,      
  GLdouble eyey,      
  GLdouble eyez,      
  GLdouble centerx,   
  GLdouble centery,   
  GLdouble centerz,   
  GLdouble upx,       
  GLdouble upy,       
  GLdouble upz        
);
 

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.

QuickInfo

  Windows NT: Use version 3.5 and later.
  Windows: Use Windows 95 and later.
  Windows CE: Unsupported.
  Header: Declared in glu.h.
  Import Library: Link with glu32.lib.

See Also

glFrustum, gluPerspective