what is the minimum number of real numbers required to define the position and orientation of a “no-roll” virtual camera?why?

How many floating point parameters does the gluLookAt function take?Why is this number not the same as in the above question?

void gluLookAt (

GLdouble eyex,

GLdouble eyey,

GLdouble eyez,

GLdouble centerx,

GLdouble centery,

GLdouble centerz,

GLdouble upx,

GLdouble upy,

GLdouble upz);

First three parameters are the camera postion, next three are camera looking at position and the last three are the up vector.

yaro

i started to answer, but it sounds like a homework question.