[Radiance-general] applied material to all faces of a genbox

[Greg Ward]

Hi Marija,

Which version of replmarks.c are you using?  There was a bug pointed  
out by Zack Rogers and fixed in late January of this year in this  
part of the code, so you should be sure you have the latest copy  
(vers. 2.15, reported at the top of the file).  Specifically, it spat  
out incorrect rotations when the new X' axis was aligned with the  
world Z axis.

-Greg

> From: "Marija Velickovic" <maricanis at gmail.com>
> Date: May 8, 2008 4:25:23 AM PDT
>
> Thanks Greg,
>
> Your explanation solves my problem, and now I have another related
> question, of course :)
>
> If my material is defined in some plane, for example ZX, and I have a
> surface in some other plane, how can I calculate needed
> transformations (rotations), to place the material correctly.
>
> I wrote the script and used the code from replmarks.c but it seems I'm
> missing something important. Calculated rotations give good results
> for some surfaces and bad for others.
>
> So question is how should I calculate 3 rotation angles for -rx -ry
> and -rz, if I have:
> * starting right-oriented coordinate system defined with vectors
> x0,y0,z0  (plane where material is defined) and
> * surface coordinate system defined with vectors x1,y1,z1 (calculated
> from tree points on surface plane and normal)
>
> Thanks again,
> Marija.