sPHENIX EMCal discussion

[Dan Cacace <dannycacace AT gmail.com>]

John,

I was playing around with it in MATLAB via pcread(‘Scan2.ply’); they have some functionality specifically for point clouds. pcfitplane does as it sounds and works rather nicely, though doesn’t define the planes for the reflector or light guide sides, as there are no points there. Those planes and point sets can tell us the flatness and angles as you suggested. I used some sketchy geometry tricks to get the two missing planes and from there, the four corners and the distance between them. I'm going to see how those numbers match up with the block. Here are a few pictures of pretty plots.

-Dan

On Tue, Sep 4, 2018 at 11:56 PM John Haggerty <haggerty AT bnl.gov> wrote:

Dan,

Very amusing... it can be imported into the physics world in Mathematica
(ala Import["Scan2.stl"]), although I didn't come across a lot of tools
for manipulating it, although it can also render it.  Mac freeware
GLC_Player makes pretty pictures and sections, but I don't see any
analysis tools.

Not unexpectedly, my consultant recommended trimesh:

> https://github.com/mikedh/trimesh

and I was able to import it and show() it in a minute or so despite the
1.15M triangles.  I think we may be able to extract surface flatness
distributions and angles... once we find the surfaces.  Or maybe we
could figure out how to do differences from the 3D model of the block
itself, although one would have to develop some procedure for aligning
the model with the point cloud.

On 9/4/18 5:30 PM, Dan Cacace wrote:
> Hi All,
>
> Anne asked me to send out the information for the 3D scanner we bought
> and the scan of a block. We have the EinScan-SP
> <https://www.einscan.com/einscan-se-sp>, with an accuracy of ≤0.05 mm
> and resolution of 0.17 mm ~ 0.2 mm. Attached is a scan I took, as well
> as four images of the point cloud. The first three show the bumps on the
> block from the screens and the second three show some small dimples or
> pitting and texture in the block.
>
> -Dan
>
>
> Scan2.stl
> <https://drive.google.com/file/d/1DG0yqkRdLj7ngTmNdPWbzyY4bATwt3wF/view?usp=drive_web>
>
>
> image.png
> image.png
> image.png
> image.png
> image.png
> image.png
>
> On Fri, Aug 31, 2018 at 11:37 AM Craig Woody <woody AT bnl.gov
> <mailto:woody AT bnl.gov>> wrote:
>
>     That sounds like it definitely might be worth exploring.
>
>     On 8/31/2018 11:25 AM, Sickles, Anne M wrote:
>>     Hi Craig,
>>
>>     This first attempt was at a lab that was more designed for
>>     hobbists and art uses on campus.  I don’t think the resolution is
>>     good enough and certainly having the image quality depdend on the
>>     distance someone was holding an the device away from the block
>>     isn’t repeatable enough for us.
>>
>>     We’ve got information on another engineering focussed facility on
>>     campus and we’re going to try that and that’s probably the better
>>     way forward.
>>
>>     Best,
>>     Anne
>>
>>     —————————————————————
>>     Anne Sickles
>>     Assistant Professor of Physics
>>     University of Illinois at Urbana-Champaign
>>     —————————————————————
>>
>>
>>     On August 31, 2018 at 10:21:39 AM, Craig Woody (woody AT bnl.gov
>>     <mailto:woody AT bnl.gov>) wrote:
>>
>>>     Hi Dan and Anabel,
>>>     A resolution of 0.1 mm is .004", which probably not good enough to
>>>     see the detail we would like to see anyway, but the image you showed
>>>     looks much worse than that. I presume it's because the distance
>>>     was so
>>>     much larger than where it was specified. The scanner Dan
>>>     suggested had a
>>>     "Point Distance" resolution of 0.09-0.12 mm for the upgraded
>>>     model (so
>>>     about the same), which may have the same problem. However, why
>>>     was the
>>>     distance they chose so large ? I presume it was so that they could
>>>     capture the image of the entire block in a single scan. Would it
>>>     improve
>>>     if they reduced the distance and made multiple scans ?
>>>
>>>     Cheers,
>>>     Craig
>>>
>>>     On 8/31/2018 10:26 AM, Romero Hernandez, Anabel wrote:
>>>     > Hi Craig and Dan,
>>>     >
>>>     > From what they told me, they were using this "Capture Mini" 3D
>>>     scanner:
>>>     https://www.3dsystems.com/3d-scanners/geomagic-capture-mini/specifications
>>>     >
>>>     > The "Capture Mini" has a resolution of 0.1 mm at a distance of
>>>     ~23 cm and accuracy of 0.034 mm, but they were using a distance
>>>     of ~1m to scan the block, so the resolution was definitely
>>>     greater than that.
>>>     >
>>>     > Best,
>>>     > Anabel
>>>     > ________________________________________
>>>     > From: Craig Woody [woody AT bnl.gov <mailto:woody AT bnl.gov>]
>>>     > Sent: Friday, August 31, 2018 6:18 AM
>>>     > To: Dan Cacace; Romero Hernandez, Anabel
>>>     > Subject: Re: [Sphenix-emcal-l] Update on 3D scan of blocks
>>>     >
>>>     > I was going to ask the same question. >From the scanned image,
>>>     the resolution looks rather poor.
>>>     >
>>>     > On 8/30/2018 11:28 PM, Dan Cacace wrote:
>>>     > Hi Anabel,
>>>     >
>>>     > Do you happen to know the resolution and accuracy they claim
>>>     they can achieve or the brand/model of the scanner they use?
>>>     >
>>>     > Thanks,
>>>     > -Dan
>>>     >
>>>     > On Thu, Aug 30, 2018 at 9:02 PM Romero Hernandez, Anabel
>>>     <acr4 AT illinois.edu
>>>     <mailto:acr4 AT illinois.edu><mailto:acr4 AT illinois.edu>
>>>     <mailto:acr4 AT illinois.edu>> wrote:
>>>     > Hi,
>>>     >
>>>     > I used one of the 3D scanning services of the UIUC (the
>>>     "MakerLab") to scan one of the blocks and I'm attaching the
>>>     results to this e-mail (I'm also attaching pictures of the block
>>>     for comparison). It seems this service doesn't have enough
>>>     resolution to see the details of the block, but I'm looking into
>>>     other UIUC services that might.
>>>     >
>>>     > Best,
>>>     > Anabel
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John Haggerty
email: haggerty AT bnl.gov
cell: 631 741 3358
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