[Radiance-general] Re: panoramic images [was: applied material ...]

[steve michel]

Yes the parallax issue of having to match the camera angle with the render view:
The fisheye pic seems like an elegant solution.
Ill work with that.. I just wanted to find a good method 'on paper' first before committing.
 
Plenty of fisheye pics out there to try this out with..
 
thanks again Thomas, Greg
Steve
 
 
> Subject: Re: [Radiance-general] Re: panoramic images [was: applied material ...]> Date: Tue, 27 May 2008 20:12:23 -0700> To: radiance-general at radiance-online.org> From: gregoryjward at gmail.com> > I like Thomas' original suggestion of mapping an image to the window > and using an illum with the appropriate sky distribution. If you > simply use the fisheye.cal mapping I recommended earlier and apply it > to a fisheye capture out the window, all should be well for any > perspective view. However, you will need a fairly high resolution > fisheye image to make this work. The description goes something like > this:> > # Define sky> !gensky 5 27 12> > # Define high frequency view out window> void colorpict west_view> 9 red green blue outsideHF.pic fisheye.cal fish_u fish_v -rz 90> 0> 0> > # Apply view to sky only for West elevation> skyfunc mixfunc full_sky_pat> 4 west_view void "if(Dx,0,-Dx^.4)" .> 0> 0> > # Apply this to the sky> full_sky_pat glow sky_glow> 0> 0> 4 1 1 1 0> > sky_glow source sky> 0> 0> 4 0 0 1 360> > # Define window glazing> void glass window_glass> 0> 0> 3 .92 .92 .92> > # Window angle affects transmittance, so use approximation to this> skyfunc brightfunc win_func> 2 winxmit winxmit.cal> 0> 0> > # Define the window as an illum minus the exterior pattern> win_func illum window_illum> 1 window_glass> 0> 3 1 1 1> > I tried it, and it seems to work OK.> > -Greg> > > From: Thomas Bleicher <tbleicher at arcor.de>> > Date: May 27, 2008 1:48:40 PM PDT> >> > On 26 May 2008, at 19:11, steve michel wrote:> >> >> It occured to me that since cyl.cal already exist, could mkillum > >> the sky/ground light distribution be applied to the cylinder of a > >> panaromic view? That would eliminate having to match the viewpoint > >> angle with the picture. As you no doubt see, I want to avoid > >> 'forking' renders and get the accuracy and presentation in one > >> render.> >> > According to the man page mkillum does not work for cylinders (it > > works for> > spheres, though, but there is no point in creating a sphere to > > simulate the> > sky).> >> > Perhaps you could use Radzillas 'ghost' material. IIRC that was a > > material> > that was visible but did not influence the lighting calculations. > > If this is true> > you can create a cylinder around your scene without compromising > > the sky> > distribution.> >> > Regards,> > Thomas> > _______________________________________________> Radiance-general mailing list> Radiance-general at radiance-online.org> http://www.radiance-online.org/mailman/listinfo/radiance-general
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