"kike" <dry### [at] hotmailcom> wrote in message 
news:web.47fdd7d17def4b5dbe7bfb550@news.povray.org...
>
> Hi guys:
>
> I've got a problem. I would like to simulate a broken glass in several 
> stages. I
> mean, first the glass is hit so it goes moreless like this:
> http://www.alucare.co.uk/controlpanel/shoppics/Image/broken%20glass.JPG
> and then the glass is broken into pieces. I know moreless how to do the 
> second
> stage.
>
> But the first one is quite more difficult. I have tried by texturing a box 
> with
> a crackled texture but no way. Then I have tried with an image_map, but 
> again,
> no success. It looks too much like an image, you know what I mean. A third 
> idea
> would be to divide the glass into pieces and to put them together (with a 
> cgs
> for example). I havent tried this last one.
>
> The question is: do you know about someone working in something similar?
>
> thanks on advance.
>

I've not done anything like this, but variations of the two approaches you 
mention are what spring to my mind.

Starting with a crackle pattern with blackhole warps to concentrate the 
pattern around the holes. You could overlay turbulent radial patterns 
eminating from the holes. To get the fractures through the glass thickness 
you could use the same pattern as a height field then slice off the top and 
bottom with a plane bearing the pattern. That way you could give the height 
field a higher ambient setting to emulate the white veins inside the body of 
the glass.

Plan B - If you intend to define individual pieces that fit together for the 
flying glass, then you could use those pieces for the intact, cracked piece. 
You could give each piece a bright white edge by using an copy of that piece 
as an object pigment, scaled down very slightly in X and Y and scaled up in 
Z (centre on origin, scale and translate back again). I recall seeing a 
POV-Ray image on this news group that applied thick black lines around 
objects to achieve a cartoon-like effect, I don't know if they used this 
technique, but, if the author published their technique then you might be 
able to adapt something from that.

Regards,
Chris B.

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