What is the definition of gluLookAt?
The description of the gluLookAt is as follows:
Let UP be the vector upXupYupZ.
Then normalize as follows:
Finally, let s=f×UP″, and u=s×f.
M is then constructed as follows:
gluLookAt is equivalent to
glTranslated(-eyex, -eyey, -eyez);
Can you explain the description above?Especially the define of M,the line with ????.
Thank you very much.