[Radiance-general] Ambient exclude transfomed material in instances

[Jack de Valpine]

Hi Greg,

Well my experience is this. I obtained a trial/demo version of xfrog 
which comes with some sample trees. In order to test the geometry in 
radiance I exported a sample tree as obj. When I tried obj2rad, I got a: 
Waverfront syntax error near line <...>: Zero normal. However, if I take 
the xfrog obj into PolyTrans and re-export it, I get an obj file that 
works fine.

-Jack

Gregory J. Ward wrote:
> Hi Jack,
>
> Thanks for the idea of using obj2mesh.
>
> As to your question, the final modifier is the one that must be 
> excluded (or included) using the -a[eEiI] option.  I Iebele's file, 
> this means the mixpict modifier.
>
> Do you know what error comes out of obj2mesh using the xfrog .OBJ file?
>
> -Greg
>
>> From: Jack de Valpine <jedev at visarc.com>
>> Date: April 2, 2007 2:00:36 PM PDT
>>
>> Hi Greg and Iebele,
>>
>> I have a comment and a question on this.
>>
>> First, Iebele, I have also just gotten a 3D xfrog tree. FYI, it is 
>> possible to generate an obj, convert to a radiance mesh and use Local 
>> u,v coordinate mapping to get the leaf and bark materials to apply. I 
>> have a tree right now that basically has a few materials defined for it:
>> bark with colorpict modifier
>> leaf with colorpict modifier
>> leaf-mix mixpict - this uses an alpha version of the leaf to mix 
>> between void (ie where the alpha is black) and the leaf material (2)
>> The question for Greg is this, to exclude the leaves from the ambient 
>> calculation what needs to be listed in the exclude file the "leaf" 
>> material and/or the "leaf-mix" material?
>>
>> Iebele, the one thing to note is that the obj file that comes out of 
>> xfrog does not play well with obj2mesh or obj2rad. Thus I have to 
>> bring it into PolyTrans and re-export as an obj to get a file that 
>> radiance is happy with.
>>
>> Best,
>>
>> -Jack
>
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