Re: HUD's and DVR - what works

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Randy Fox (rfox++at++coryphaeus.com)
Tue, 27 May 1997 11:07:22 -0700

Thanks for the response. I didn't know about pfPixScale. The HUD's get
fuzzier as the resolution get smaller, though line width stays constant.
   Seems to be pixelation due to the scaling, though mutlisample helps. Is
there anything else I can try? Should I try line smooth instead of
multisample? Can I control the number of bits dedicated to the subpixel
calculation?

At 80 - 90 % fixed scale of DVR it looks pretty good to me. Does any one else
have any metrics on what is exceptable and when it is not for a real world sim?

-randy

On May 23, 12:53am, Sharon Clay wrote:
> Sorry for the delayed response - I've been gone again for the past few days.
>
> Anyway, I'd like to just add a little extra info and clarify some things:
>
> 1) For DVR you should use a texture or a stroke font so that it can be scaled
> by the viewport. All bitmaps and pixel ops will have the scale
problem,
> X or not. For points and lines, Performer is taking car of
> the scale problem by automatically calling pfPixScale() which we
> check in the point and line gsets to properly scale these pixel-sized
> primitives. If you use a stroke font library that uses lines to draw
your
> own fonts without Performer you'll have to do the same.
>
> 2) You can pick a few fixed bitmap sizes for an approximation and choose
> them based on the current viewport size or DVR scale.
> Note that you can get the current viewport size with
> pfGetChanOutputViewport()
> and the DVR scale with pfGetPVChanScale()
>
> You might also want these routines if you need to properly place
drawing in
> the smaller viewport.
>
> 3) X is ignorant of DVR (as pointed out already) and in particular the X
cursor
> so as Philip also pointed out, Performer provides a 2D cursor drawn in
the
> bitplanes in libpfutil.
>
> 4) As above, overlay planes are also resized by DVR and so can't really be
used with
> DVR. Do NOT redraw the overlays every frame :-)
>
>
> src.
>
>>-- End of excerpt from Sharon Clay

-- 
Randy Fox                               Coryphaeus Software, Inc.
Sr. Software Engineer			985 University Ave. Suite 31
rfox++at++coryphaeus.com                     Los Gatos CA, 95030
www.coryphaeus.com                      Tel: 408/395-4537         
                                        Fax: 408/395-6351
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