[Radiance-general] Preview error - unknown object type "ashik2"

[Greg Ward]

Hi Schorsch,

The Ashikhmin-Shirley reflectance model is a kind of anisotropic Phong model made physically plausible.  It's main advantage over the standard anisotropic model in Radiance is that it includes a Fresnel modifier, which I use for perfectly smooth surfaces.  Best to read their original paper:

	www.cs.utah.edu/~shirley/papers/jgtbrdf.pdf

I added this model to Radiance a few years back with help from Nicolas Bonneel, as we were trying to run some comparisons.  Peter Apian-Bennewitz also had requested it, so it seemed worthwhile to add.

Cheers,
-Greg

> From: Georg Mischler <schorsch at schorsch.com>
> Subject: Re: [Radiance-general] Preview error - unknown object type "ashik2"
> Date: April 21, 2016 10:34:16 PM PDT
> 
> Is there any documentation on how to actually use this material?
> So far it is only mentioned in a release note and on some presentation
> slides, but not explained at all.
> What are eg. useful input values for "specular power"?
> 
> Cheers
> -schorsch
> 
> 
> Am 2016-04-21 18:39, schrieb Greg Ward:
>> The '_unknown object type_' error is caused by reading in a frozen
>> octree (generated with "oconv -f") on an older version of Radiance,
>> before this type was added. You need to update your copy of Radiance
>> from https://github.com/NREL/Radiance/releases [1]
>> Chris has the right advice on X11.
>> Cheers,
>> -Greg
>>> FROM: Paulína Šujanová <paulina.sujanova at stuba.sk>
>>> SUBJECT: [Radiance-general] Preview error - unknown object type
>>> "ashik2"
>>> DATE: April 21, 2016 2:07:46 AM PDT
>>> Hello,
>>> please I need help. Whenever I run objpict or objview or rvu, I get
>>> the same warning each and every time:
>>> _rpict_ (or rvu accordingly)_: warning - unknown object type
>>> "ashik2" _
>>> This error repeats no matter what I try to preview, a simple chair
>>> or a more complex model.
>>> The preview than is/is not produced - I was not able to identify the
>>> trigger.
>>> I am new to Radiance (and Linux). I got aware of this problem since
>>> I reinstalled Radiance from the NREL Radiance releases (I did this
>>> because I realised I was missing some files).
>>> If I do understand it well, ashik2 should be an anisotropic BRDF
>>> model, describing the appearance of a material, and it is a
>>> calculation model - so "something built in".
>>> Please, how do I fix the problem? Can please someone explain what
>>> went wrong?
>>> I also get an X11 error.
>>> XIO: fatal IO error 11 (Resource temporarily unavailable) on X
>>> server ":0.0"
>>> This was already once discussed on the mailing list, but was not
>>> somehow resolved. I have tried to upgrade the graphic card driver,
>>> but with no impact. Please, did someone solve this?
>>> Thanks,
>>> Paulína
>>> _______________________________________________
>>> Radiance-general mailing list
>>> Radiance-general at radiance-online.org
>>> http://www.radiance-online.org/mailman/listinfo/radiance-general
>> Links:
>> ------
>> [1] https://github.com/NREL/Radiance/releases
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> 
> -- 
> Georg Mischler  --  simulations developer  --  schorsch at schorsch com
> +schorsch.com+  --  lighting design tools  --  http://www.schorsch.com/
> 
> 
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