[Radiance-general] Re: spatial scale in .obj file

[Greg Ward]

Hi Bei,

The command:

	% obj2rad test.obj | getbbox

returns:
      xmin      xmax      ymin      ymax      zmin      zmax
  -1.58231   1.51769   18.3588   21.4588  0.949999      4.05

 From this, you can deduce that the sphere has a radius of 3.1 and is  
centered at the average of the above coordinates, or (-.0323, 19.9,  
2.5).  You can also run objview on the output of obj2rad (after adding  
a material) and look at it.

In general, we discourage people from posting attachments to the  
mailing list, but this one was pretty small so hopefully it won't  
cause any trouble.

Cheers,
-Greg

> From: bei.xiao at gmail.com
> Date: December 4, 2009 6:31:34 PM PST
>
> Hi,
>  Does anyone know how to recover the spatial scale in an .obj file?
> For example, I have an .obj file of a sphere, without any more
> information, can I recover its radius in cm?  Also, is the number in
> .obj or .rad file specified in cm? Attached please find the .obj file
> of the sphere.
>
> Thank you very much.
>
> Bei
>
> -- 
> Daily quote:
>
> "Real generosity toward the future lies in giving all to the  
> present. "
>
> -Albert Camus
>
> Bei Xiao, PhD
> Postdoctoral Scientist
> The Smith-Kettlewell Eye Institute
> 2318 Fillmore Street
> San Francisco, CA 94115
> (415) 3452149
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