[Radiance-general] Rectangular perforations

[toren.com architectuur visualisaties]

Hello group,

Here I am again....
Nobody responded on my email, but a friend found the answer.
For those who are interested, here is the .cal file for rectangular perforations.

Iebele

{
        perforate.cal
        Perforation function for approximately horizontal sufaces,
        for use in a mixfunc. Foreground is solid, background the holes.
        Set background to empty for a true perforation, or to a different
        material for polka dots.

        Relative hole size is determined by A1.
        Size of single circle is 1 - scale as required (eg. 0.05m).

        x_hole cuts holes in x-direction (through the y-z plane)
        y_hole cuts holes in y-direction (through the x-z plane)
        z_hole cuts holes in z-direction (through the x-y plane)

       A1 is de schaal
       A2 XY size of hole ( 0.2 is small, 0.5 big )
       A3 YZ size of hole
       A4 XZ size of hole

        Abel Boerema 2004, n.a.v.Georg Mischler 30. 04. 1993
}

`xn = mod(Px, 1) - A2;
`yn = mod(Py, 1) - A3;
`zn = mod(Pz, 1) - A4;

`outofcirc(x, y, r) = if(   (if ( x-r, 0, 1 )) * (if (y-r, 0, 1))  , 0, 1    );

z_hole = `outofcirc(`xn, `yn, A1);
x_hole = `outofcirc(`yn, `zn, A1);
y_hole = `outofcirc(`zn, `xn, A1);


----





"toren.com architectuur visualisaties" wrote:

> Hello group!
>
> I once found a cal file from Georg Mischler for circular perforations.
> Now I wondered how to create rectangular perforations in a similar way.
> Who has an idea (Georg?).
>
> Iebele
>
> -------------------------------------------------------------------------------
>
> {
>         perforate.cal
>         Perforation function for approximately horizontal sufaces,
>         for use in a mixfunc. Foreground is solid, background the holes.
>         Set background to empty for a true perforation, or to a
> different
>         material for polka dots.
>
>         Relative hole size is determined by A1.
>     Size of single circle is 1 - scale as required (eg. 0.05m).
>
>         x_hole cuts holes in x-direction (through the y-z plane)
>         y_hole cuts holes in y-direction (through the x-z plane)
>         z_hole cuts holes in z-direction (through the x-y plane)
>
>     Georg Mischler 30. 04. 1993
> }
>
> `xn = mod(Px, 1) - 0.5;
> `yn = mod(Py, 1) - 0.5;
> `zn = mod(Pz, 1) - 0.5;
>
> `outofcirc(x, y, r) = if(sqrt(x*x + y*y) - r, 1, 0);
>
> z_hole = `outofcirc(`xn, `yn, A1);
> x_hole = `outofcirc(`yn, `zn, A1);
> y_hole = `outofcirc(`zn, `xn, A1);
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