[Radiance-general] Ambient exclude transfomed material in instances

[Gregory J. Ward]

Hi Iebele,

I can't be much help on this, as I'm not familiar with the model, but  
the general idea with local coordinates is that you don't have to do  
the mapping yourself.  It's supposedly handled by the mesh generation  
software, and isn't affected by transformations as a global  
coordinate mapping would be.

I hope this is a helpful clue, as it's about all I have to offer.
-Greg

> From: iebele <info at iebele.nl>
> Date: April 3, 2007 8:39:12 AM PDT
>
> Thanks Greg an Jack for your excellent and very  helpfull suggestions.
>
> I now have succesfully converted the .obj file to rad, using  
> obj2rad ( polytrans did indeed work with Xfrog obj-files, but  
> meshlab did not accept these files Lars ).
>
> However I can't get the mapping right. I've tried a lot, but with  
> no succes. Would you please share with me an example of the  
> materials you use for the bark and the leaves?
>
> I just don't really understand when and how to use Lu and Lv  or  
> frac(Lu) and frac(Lv) in the colorpict modifier and how these can  
> ever be placed  in a reasonable way on each triangle in the output  
> of obj2rad, which in my case is like :
>
> leaf_col_leaf2 polygon leaf22836.60976
> 0
> 0
> 9
>         -0.250204           0.195593             13.838
>          -1.00383          -0.956752            13.8816
>          -1.21881           -0.19178            13.5622
>
> I never really understood the meaning of texture-coordinates, but  
> at this time I feel that is what  is  missing here.
>
> Is there a difference in using obj2rad and obj2mesh for this  
> purpose ? I tried both but with the some odd results concerning the  
> coordinate mapping.
>
> -Iebele