[x3d-public] OrthoViewpoint fieldOfView

[GPU Group]

Correct!

On Sat, May 5, 2018 at 12:25 PM, Andreas Plesch <andreasplesch at gmail.com>
wrote:

> > Date: Fri, 4 May 2018 15:32:48 -0600
> > From: GPU Group <gpugroup at gmail.com>
> > To: X3D Graphics public mailing list <x3d-public at web3d.org>
> > Subject: Re: [x3d-public] OrthoViewpoint fieldOfView
> > Message-ID:
> >         <CAM2ogRc8-11CY6aDyiOYThBiEY4ZnXDU2jfeEnD
> A-6qcp92W8w at mail.gmail.com>
> > Content-Type: text/plain; charset="utf-8"
> >
> > Its like a zoom.
> > on bind, freewrl checks if fieldOfView.n == 4 and copies, else uses
> defaults
> > then on each frame, it honors the ymax - ymin range (like you say a
> single
> > value would do)
> > - and scales the xmax- xmin range to match the aspect ratio of the
> screen.
> > -- this assumes you don't want anisotropic scaling,
> > - and treats the field as outputOnly on each frame (in case you want to
> > know the range in other nodes)
> > - until the next bind when it starts fresh
> > -Doug
>
> Thanks.
> It is like a zoom, and potentially also like an offset if the min and
> max values are not centered on 0.
> Always scaling the x range according to the window aspect ratio may
> sometimes cut off the requested minimum x range, I believe ?
> For example, if the fieldOfView is -10,-1,10,1 , eg. the requested
> minimum x range is -10,10, and the window aspect ratio is 1:1, then
> scaling the x range would mean cutting it down to -1,1, no ?
> So other browsers check if the requested width/height aspect ratio is
> larger than the display aspect ratio, and if so rescale the y range,
> and if not rescale the x range.
>
> -Andreas
>
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