[Radiance-general] materials and texfunc

[Jia Hu]

Thank you very much. I am learning the tutorial of Axel Jacobs. It is very
good.

In Ubuntu, I built materials,  rad, sky.mat, sky.rad and .vf. files, when I
use oconv to compile them, I have to input the command into the terminal
window of Ubuntu to execute the command. Can I just run a script which
contains multiple commands such as oconv and rvu?

Thanks,

Jia

On Wed, Jul 7, 2010 at 12:46 AM, Rob Guglielmetti <rpg at rumblestrip.org>wrote:

>  Hi Jia,
>
> Some quick answers:
>
> 1. The Luxal resource is an excellent starting point for values, but yes
> measurement of your own samples is the best way. The macbethcal procedure
> that is documented in Rendering with Radiance is very useful, too. If
> Ecotect is giving RGB values in the 0-255 range, then yes you would divide
> the color channels by 255 to get a 0-1 value that Radiance expects.
>
> 2. textfunc is a Radiance material primitive, not a program, so there is no
> manual page for it. Its use is documented in the Radiance reference manual
> and several other places. Linkage:
>
> http://radsite.lbl.gov/radiance/refer/materials.pdf
> http://radsite.lbl.gov/radiance/refer/refman.pdf
>
> 3. To use a .png as a pattern, you need to save it in .hdr format for
> Radiance to use it. if you first convert the .png to .tiff, you can then use
> ra_tiff to convert it to .hdr format thusly:
>
> ra_tiff -r pattern_image.tif pattern_image.hdr
>
> Axel Jacobs has some good stuff on using images as patterns in his
> tutorials.
>
> Hope this helps...
>
> - Rob
>
>   On Jul 6, 2010, at 8:25 PM, Jia Hu wrote:
>
>   Hi all:
>
> I have some questions.
>
> (1) Besides measure, through which methods I can find the common values of
> material property, such as RBG, reflectivity and roughness value? I know
> two places: Colar picker at http://luxal.eu/resources/radiance/index.shtml
> and Ecotect which provides some examples, but RBG values are not 0-1, should
> I divide the RBG value by 255?
>
> (2) When typing "man texfunc", I can not find the command. Is that my
> installation problem?  I use ubuntu and Radiance version 4.0.
>
> (3) Is that right I can add texture and pattern by using procedural
> functions (e.g. wrinkle.cal) and bitmaps accoring to
> http://www.artifice.com/radiance/rad_materials.html ?  If I have an image
> with an .png extension, how can I add the image as the the pattern ?
>
> Thank you.
>
> Jia
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