Consider me humbled, guys. <hangs his head in shame>
a|x --- On Mon, 7/12/09, Steve Mokris <[email protected]> wrote: > From: Steve Mokris <[email protected]> > Subject: Re: camera/eye position > To: "quartzcomposer-dev list list" <[email protected]> > Date: Monday, 7 December, 2009, 18:26 > > -1.73205 seems a bit arbitrary. > I wonder what the reasoning was behind that decision... > > Given: > - You want the coordinate system to be > -1 to +1 in the X direction. > - You want the FOV to be 60deg. > > Look at one half of the viewport --- cast a ray from the > camera through the origin, then turn left or right --- a > right triangle. > > tan(theta) = (opposite) / (adjacent) > tan(fov/2) = (1) / (d) > d = 1/tan(fov/2) = 1/tan(60/2) = approx 1.73205 > > > > > -- > ("for all who would like to know" ;) > > _______________________________________________ > Do not post admin requests to the list. They will be > ignored. > Quartzcomposer-dev mailing list ([email protected]) > Help/Unsubscribe/Update your Subscription: > http://lists.apple.com/mailman/options/quartzcomposer-dev/the_voder%40yahoo.co.uk > > This email sent to [email protected] > _______________________________________________ Do not post admin requests to the list. They will be ignored. Quartzcomposer-dev mailing list ([email protected]) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/quartzcomposer-dev/archive%40mail-archive.com This email sent to [email protected]
