Zoom about a point

system · March 31, 2003, 5:50pm

Can anybody help me with zooming about a point in orthographic and perspective views. I know i can change fov and zoom but how would i do it about a point.
Thanks in advance

Gavin · March 31, 2003, 11:47pm

You mean zoom about a point that is not centred?

system · April 1, 2003, 3:42am

yes

system · April 1, 2003, 4:45am

gluLookAt( x, y, z, x2, y2, z2, x3, y3, z3) http://www.cevis.uni-bremen.de/~uwe/opengl/gluLookAt.html

xyz - current eye coordinates
x2y2z2 - location of object looking at
x3y3zy - which way is up?

move your eye location closer to your target to zoom… you could use 3d spherical coordinates for nice zoom effects http://walet.phy.umist.ac.uk/QM/LectureNotes/node62.html

system · April 1, 2003, 6:36am

i am trying to zoom using fov ,so if i am zooming about a point then i assume i need to move my model is it right?