-1.73205 seems a bit arbitrary. I wonder what the reasoning was behind that decision...
a|x --- On Mon, 7/12/09, Christopher Wright <[email protected]> wrote: > From: Christopher Wright <[email protected]> > Subject: Re: camera/eye position > To: "Boštjan Čadež" <[email protected]> > Cc: [email protected] > Date: Monday, 7 December, 2009, 14:15 > > does anyone know where exactly > the camera is in QC? > > i asked this on Kineme forums some time ago and > Christopher said its at 0,0,1. im trying to move objects > along a vector that goes from the eye and through a point on > the screen. from experiments i did it turns out somewhere > near 0,0,1.732. with these eye coordinates the sprites on > different scales of the same vector get approximately same > screen coordinates. > > > You're correct -- using OpenGL Profiler, you can spot this > in the trace (of an otherwise empty composition with the > visualizer opened): > > 0.11 µs glMatrixMode(GL_PROJECTION); > 0.67 µs glGetFloatv(GL_PROJECTION_MATRIX, > 0x19a3cd04); > 0.74 µs glGetIntegerv(GL_FRONT_FACE, > 0x19a3ccbc); > 0.59 µs glFrontFace(GL_CCW); > 0.68 µs glFrustum(-0.057735, 0.057735, > -0.0433013, 0.0433013, 0.1, 100); > 0.66 µs glTranslatef(0, 0, -1.73205); > > the frustum defines the near and far planes, and some other > projection information, and the translate sets the camera > position. > > My earlier estimation of it being at 0,0,1 was without > collecting any data. 1.73205 as the Z position is the > correct Z coordinate. > > -- > [ christopher wright ] > [email protected] > http://kineme.net/ > > _______________________________________________ > 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]
