[Radiance-general] perforate.cal

[Giulio Antonutto]

As you say you need to define UV first.
If you have a mesh and not UV values I cannot help you.
Sorry,
giulio

-----Original Message-----
From: radiance-general-bounces at radiance-online.org
[mailto:radiance-general-bounces at radiance-online.org] On Behalf Of atelier
iebele abel
Sent: 13 April 2005 15:56
To: Radiance general discussion
Subject: Re: [Radiance-general] perforate.cal

Hi Giulio,

Thanks for your quick reply. I will give Bodypaint a try, but I doubt if 
it does generate surface normals from a file that doesn't have them.
Anyways, I wonder if the perforate.cal could be changed to work at once 
on surfaces without UV coordinates.
When mapping pictures it goed well, since I (not really me:) changed a 
few lines in picture.cal :

pic_u = U;  //was: pic_u = Px;
pic_v = V;   //was: pic_v = Py;

I don't know why this works, but it does....
If something like this could be done in the perforate.cal file, that 
would be nice,

-Iebele


Giulio Antonutto wrote:

>I would suggest to follow this route:
>
>-1- use obj to export your model with an UV mapping defined (Maxon
Bodypaint
>is what I use to create the UV, works fine... but I am pretty sure that
even
>Blender has something similar)
>
>-2- edit the cal file substituting Lu and Lv with Px Py, no need of Pz
since
>we are on a surface
>
>-3-
>Define a mesh primitive
>Define the material as usual
>
>-4- import the file with a mesh primitive and attach the material while
>importing:
>Obj2mesh -a materials model.obj > model.mesh
>
>
>
>Open you file wit objview, just a quick check,
>Hopefully all should be ok....
>
>I found this new feature really useful... all the old parametric textures
>are now UV... really cool!
>
>Cheers,
>Hope it works,
>
>giulio
>
>-----Original Message-----
>From: radiance-general-bounces at radiance-online.org
>[mailto:radiance-general-bounces at radiance-online.org] On Behalf Of atelier
>iebele abel
>Sent: 13 April 2005 15:18
>To: Radiance general discussion
>Subject: [Radiance-general] perforate.cal
>
>Hi group,
>
>I use a file called perforate.cal (from Georg).
>Is it possible to change this file in such way that use it on surfaces 
>which various normal directions ( not only through x, y or z plane) ?
>
>
>-Iebele
>
>
>perforate.cal:
>{
>        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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