OK, I know it's been gone over before, but I can't find it anywhere...
Can anyone help me out in making a windowpane of frosted glass, so it lets the
lights outside through, but you can't see through it?

Thanks
J

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Hi there,

>OK, I know it's been gone over before, but I can't find it anywhere...
>Can anyone help me out in making a windowpane of frosted glass, so it lets
the
>lights outside through, but you can't see through it?

Well, one way I've done this is with two boxes (polygons, planes... whatever
you desire) in the same place. One's got a filter value to dim the light a
bit, the other is opaque and has  no_shadow enabled. This way, the light
gets through but you can't see outside. In case it's too dark, just bump up
the ambient value.

Hope that helps,
Ade

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J wrote in message <35b4f959.3340295@news.povray.org>...
>OK, I know it's been gone over before, but I can't find it anywhere...
>Can anyone help me out in making a windowpane of frosted glass, so it lets
the
>lights outside through, but you can't see through it?


Well, frosted glass in real live gets its effect from either embedded little
shapes (mostly air-bubbles) or from a very uneven surface, often in some
kind of repeating pattern.

Embedding airbubbles one by one would be hard, but you can make a nice
while-loop which differences a lot of spheres out of your windowpane (which
would be a "flat" box). Of course you need a lot of those bubbles and they
need to be very small compared to the size of the pane!

An uneven surface should be possible by heavily disturbing the normal of the
pane. Either with some pattern or with a normal-map (with a map you can even
achive some kind of pattern).

Or combine both...

And don't forget to set the refraction index (ior) to something >1 (1.5 for
glass?)

But be warned: The frosted effect in real live is created by heavily
refracting the light falling through the window. The methods above do it in
the same way - so prepare for some longer render-times (especially if you
add reflection too)...

Hope it helps,
Johannes.

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Vue d'Esprit 2, a full object renderer in the Bryce style
(but MUCH better, IMHO) has a feature in which a blur
can be specified for transparent or reflective object --
lightrays which encounter the surface are split to make
a blurred reflection or transmission.

ref : http://www.e-onsoftware.com/

This is a very nice feature, I think.  It is a potential
upgrade for POV.

Dan

-- 
http://www.flash.net/~djconnel/

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J wrote:
> 
> OK, I know it's been gone over before, but I can't find it anywhere...
> Can anyone help me out in making a windowpane of frosted glass, so it lets the
> lights outside through, but you can't see through it?
> 
> Thanks
> J
Hello,

recently I did some trials on frosted glass. This one seems to work
quite nice and takes not too much time for rendering. Apply it to a thin
box (approx 0.1 units)

//pov-code


#declare milkyglass =
          texture {pigment {White filter 0.95}
             normal {bumps 0.4}
             finish {reflection 0.2
                    specular 0.4
                    roughness 1
                    refraction 0.4
                    ior 1.2
                    crand 0.02}
            scale 0.01
    }

//end of pov-code

ReVerSi

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Dan Connelly wrote:
> Vue d'Esprit 2, a full object renderer in the Bryce style
> (but MUCH better, IMHO) has a feature in which a blur
> can be specified for transparent or reflective object --
> lightrays which encounter the surface are split to make
> a blurred reflection or transmission.
> 
> This is a very nice feature, I think.  It is a potential
> upgrade for POV.

My WyzPOV patch can do blurred reflections, and I'll be adding blurred
transparency as soon as I have time.  Take a look at
http://www.worldaxes.com/paul_fam/povray
-- 

Mike Paul
mbp### [at] lockeccilorg
http://www.worldaxes.com/paul_fam

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Mike Paul wrote:
> My WyzPOV patch can do blurred reflections, and I'll be adding blurred
> transparency as soon as I have time.  Take a look at
> http://www.worldaxes.com/paul_fam/povray

Wow, I forgot that the server archives stuff this long.  WyzPOV now
lives at http://www.alignment.net/wyzpov/, though it's down
temporarily.  I still haven't added blurred transparency...  but I've
been reminded by myself.  :-)
-- 

Mike Paul
mbp### [at] lockeccilorg
http://www.worldaxes.com/paul_fam

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