lighting per pixel or per face? - obj2mesh (new)

hello all again,

well I finally managed to run obj2mesh (after installing last version of Radiance)
the result is somehow different but still not enough good.
http://www2.cs.ucy.ac.cy/~cs99dm1/res1mesh.jpg (new result)
http://www2.cs.ucy.ac.cy/~cs99dm1/resultRadiance.jpg (old result)

Is there anyway to make the lighting even smoother?

Thanks!
Despina

···

----- Original Message ----- From: "Despina Michael" <[email protected]>
To: "Radiance general discussion" <[email protected]>
Sent: Thursday, March 24, 2005 1:18 PM
Subject: Re: [Radiance-general] lighting per pixel or per face?

Hi,
thank you for your answers.

the model is .obj file and I used obj2rad to convert it in .rad file. Then I
added in .rad material and lighting info and use rpict to illuminate the
object.

It's not a "perfect cylinder" and this is the reason I don't use radiace
primitive cylinder (it just looks like a cylinder)

Can you tell me please how I use obj2mesh command?

I tried this
obj2mesh model.obj > out1.rtm
but it does not seem to work. There is an error: obj2mesh: fatal -
unreferenced uv coordinates

Thanks,
Despina

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Hi Despina,

If your geometry actually contains these creases, which it does, how can you expect Radiance NOT to render them? The .OBJ file you sent me has numerous problems. The creases are caused by incorrect surface normals at the patch boundaries. If you take these out by running obj2rad -f, then you see the polygonal faces and get a lot of warnings about non-planar polygons. I didn't check to determine if your polygons really are non-planar or if it's simply an issue with too few significant digits in your vertex coordinates.

I would recommend a different modeling system.
-Greg

···

From: "Despina Michael" <[email protected]>
Date: March 25, 2005 12:46:41 PM PST

hello all again,

well I finally managed to run obj2mesh (after installing last version of Radiance)
the result is somehow different but still not enough good.
http://www2.cs.ucy.ac.cy/~cs99dm1/res1mesh.jpg (new result)
http://www2.cs.ucy.ac.cy/~cs99dm1/resultRadiance.jpg (old result)

Is there anyway to make the lighting even smoother?

Thanks!
Despina