Op 27-2-2023 om 12:47 schreef Bald Eagle:
> Thomas de Groot <tho### [at] degrootorg> wrote:
> 
>> I did my transformations (on the original converted OBJ files) in
>> Poseray, centering and then rotating the vase, and dropping it to y=0,
>> /before/ exporting to POV-Ray.
> 
> I didn't play a lot with Poseray once I got the file converted.
> I wanted all the subsequent processing to be done in a way that's easily traced
> (SDL) and preserved the raw data.  But the sweet textured renders of the
> processed mesh are nice and really show the results possible with POV-Ray and
> granite_21   :)
> 
Sure!

>
https://sketchfab.com/3d-models/pre-dynastic-egyptian-vase-9d0564976fec4d718aca1d661cec212a
> 
> 
> Did you do your transformations by eye/feel?
> My -z rotation was based on some trace() results on the lug handles, followed by
> some atan2 () hocus-pocus that I'm calling good-enough for now.
> 
No. I let Poseray give me the necessary values and acted on them.


>> In my studio set-up I used trace {} to put the vase on the 'pedestal'.
>> The 'base' of the vase effectively is situated at y=0 in the geometry file.
> 
> 
> The bounding box that Poseray assigns to the vase seems fine heightwise, but
> overly wide, so getting it to sit at y=0 was fairly straightforward.

You think so? Once rendered, I do not see any significant width 
difference compared to the STL original.

> I'm wondering what Poseray and Meshlab, and even Matlab have for mesh-feature
> analysis tools.
> 
> I'm guessing that Polyworks has all the pricey bells and whistles for
> identifying such features and fitting planes, spheres and cones in a
> least-squares best-fit fashion to a model.
> 
> Maybe I need to slice the vas at the lug handle hole and inspect the mesh at a
> high magnification to see why I'm not getting good trace() results.
> 
Just wondering: did you try to trace the model while still on its side? 
I have not been trying that so I wouldn't know indeed about bounding box 
issues there.

-- 
Thomas

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