[Radiance-general] obj parser in obj2rad and obj2mesh

[Greg Ward]

Hi Lars,

I found the problem.  You have a couple of polygons with 105  
vertices, which obj2rad leaves as is, but obj2mesh has to convert  
these to triangles, since that's all the mesh primitive supports.   
Unfortunately, the algorithm in place to do this only works properly  
for convex polygons.  Implementing a proper, general triangulation  
method is a hard problem, and not something I have time for at the  
moment.

If anyone out there has a bit of code they'd like to lend to the  
cause, or a good reference they can recommend, I'd be happy to hear it.

-Greg

> From: Lars O. Grobe <grobe at gmx.net>
> Date: May 18, 2005 2:01:58 AM PDT
>
>> Both images look like they are suffering from image sampling  
>> errors.  You should try rendering these at higher resolution,  
>> setting -ps 1 in rpict (or "set ps 1" in rvu).
>>
>
> My problem is that there are large closed surfaces in the one  
> rendering, some kind of surface overlapping the window frame. I  
> tried ps 1.
>
>
>> I assume you're using the latest version of Radiance (3.6)?
>>
>
> Yes.
>
>
>> P.S.  If the problem persists and isn't just image sampling,  
>> please send me your .OBJ file (compressed), and I'll have a look.   
>> Don't copy it to the mailing list, though.
>>
>
> I attach the bzipped file. I also marked the overlapping surfaces  
> in the png file.
>
> Thank you, CU Lars.
>