Re: [MORPHMET] Re: NextEngine Laser Scanner

[Terrie Simmons-Ehrhardt]

Hi Mary-Margaret and Dave,

I've had success with the provided powder on chunks of quartz, but in
general, the NextEngine does not detect dark objects well, so I can see how
it would have a hard time with obsidian.

Terrie Simmons-Ehrhardt

On Sat, Nov 11, 2017 at 11:49 AM, Dave Norris  wrote:

> Mary-Margaret
>
> Could you recommend a foot spray?  I’ve been trying a quartz point with no
> success and was think of using painters tape but if you’ve had success with
> spray - I’d like to maybe give that a shot.
> Cheers
>
> Dave Norris
>
> Sent from my iPhone
>
> On Nov 11, 2017, at 11:28 AM, Mary-Margaret Murphy 
> wrote:
>
> Good morning, Callie and Terrie.
>
> I agree with your settings suggestions, Terrie.
>
> Also, the supplied powder with the NextEngine is (or at least with mine,
> was) pretty basic and inadequate. I ran experiments with titanium dioxide,
> bentonite power, foot powder spray, and chemical whiting. My sample
> included 2 obsidian flakes. The easiest was the foot spray.
>
> As far as a reference object, i recommend something with plane geometry, a
> matte surface and a coloration near to your objects. Something along the
> line of a die (dice), a Lego brick, or a small 3D print sample.
>
> Meshlab software is helpful, as is CloudCompare. You should check them out.
>
> Best,
>
> Mary-Margaret
>
>
> On Sat, Nov 11, 2017, 9:10 AM terrielsimmons 
> wrote:
>
>> Hi Callie,
>>
>> Are you using the old NextEngine or the Ultra? Since you are scanning at
>> a small distance, make sure your scan setting is set to macro. Try fewer
>> divisions, around 8--too many divisions for small objects causes the
>> auto-alignment to not work. The NextEngine also has a hard time aligning
>> flat objects, so if the scans don't align within ScanStudio, you might have
>> to export them to Meshlab and align them. You can email me directly if you
>> want some help with Meshlab.
>>
>> Terrie Simmons-Ehrhardt
>>
>>
>> On Friday, November 10, 2017 at 6:25:14 PM UTC-5, Callie Diduck wrote:
>>>
>>> Hello,
>>>
>>> I am working with a NextEngine Laser scanner trying to create 3D models
>>> of Avonlea Projectile Points for my Masters Thesis. I am having difficulty
>>> with the scanner not being about to stitch the individual scans together to
>>> create a 3D model. I think I've tried just about everything I can think of
>>> to make it work but I still come up short.
>>>
>>> I am wondering if the problem is that the projectile points I am working
>>> with are just too small for the scanner to handle? The points range from 14
>>> to 23mm, and about 2-3mm thick.
>>>
>>> I have been able to scan points that are larger about 26 to 35mm in
>>> length, 6mm at their widest point and get a successful 3D model out of it.
>>> Does anyone have any suggestions?
>>>
>>> The settings I am using right now are a 360 scan, 14-16 divisions, 3.3
>>> thousand points per inch, neutral for colour, and a distance from the
>>> scanner of about 9.5 inches. I am covering the scanner completely with a
>>> card board box to ensure there is no change in light.
>>>
>>> Any help or suggestions would be great. I have been trying to make this
>>> work for the past 2 months.
>>>
>>> Thanks,
>>>
>>> Callie Diduck
>>> Master's Candidate
>>> Department of Archaeology and Anthropology
>>> University of Saskatchwan
>>>
>>> --
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>>
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Re: [MORPHMET] Re: symmetrical matrix and matrix of asymmetry

[Chris Klingenberg]

Dear Sergey

The covariance matrices are characterizing the *variation* in your sample.

The one for the symmetric component of variation is about the variation 
in the averages of the original landmark configurations and their 
reflected and relabelled copies. This is what we normally think of as 
the variation in the "shape" of things if we are not specifically 
interested in asymmetry, e.g. in applications in taxonomy, ecology and 
many evolutionary questions.


The covariance matrix for the asymmetry component is about the variation 
of asymmetry among specimens -- this is fluctuating asymmetry.


Directional asymmetry is the *mean* asymmetry -- so this is not in 
either covariance matrix.


For a recent overview of all this stuff, with many references to other 
literature, see this paper:

http://www.mdpi.com/2073-8994/7/2/843

Best wishes,
Chris


On 11/11/2017 14:14, serg bar wrote:



четверг, 18 августа 2016 г., 18:58:47 UTC+3 пользователь serg bar 
написал:


I analyzed some population’s oak tree leaves (object asymmetry).
I created covariance symmetrical matrix and matrix of asymmetry in
MorphoJ.
Does symmetrical matrix signalized on directional asymmetry?
If it does, the samples with pure FA (in Procrustes ANOVA , ind *
side) really contain undetected DA in symmetrical matrix?
If it does not, the samples with pure FA contain what?

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Web site: http://www.flywings.org.uk
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Re: [MORPHMET] Re: NextEngine Laser Scanner

[Mary-Margaret Murphy]

Good morning, Callie and Terrie.

I agree with your settings suggestions, Terrie.

Also, the supplied powder with the NextEngine is (or at least with mine,
was) pretty basic and inadequate. I ran experiments with titanium dioxide,
bentonite power, foot powder spray, and chemical whiting. My sample
included 2 obsidian flakes. The easiest was the foot spray.

As far as a reference object, i recommend something with plane geometry, a
matte surface and a coloration near to your objects. Something along the
line of a die (dice), a Lego brick, or a small 3D print sample.

Meshlab software is helpful, as is CloudCompare. You should check them out.

Best,

Mary-Margaret


On Sat, Nov 11, 2017, 9:10 AM terrielsimmons 
wrote:

> Hi Callie,
>
> Are you using the old NextEngine or the Ultra? Since you are scanning at a
> small distance, make sure your scan setting is set to macro. Try fewer
> divisions, around 8--too many divisions for small objects causes the
> auto-alignment to not work. The NextEngine also has a hard time aligning
> flat objects, so if the scans don't align within ScanStudio, you might have
> to export them to Meshlab and align them. You can email me directly if you
> want some help with Meshlab.
>
> Terrie Simmons-Ehrhardt
>
>
> On Friday, November 10, 2017 at 6:25:14 PM UTC-5, Callie Diduck wrote:
>>
>> Hello,
>>
>> I am working with a NextEngine Laser scanner trying to create 3D models
>> of Avonlea Projectile Points for my Masters Thesis. I am having difficulty
>> with the scanner not being about to stitch the individual scans together to
>> create a 3D model. I think I've tried just about everything I can think of
>> to make it work but I still come up short.
>>
>> I am wondering if the problem is that the projectile points I am working
>> with are just too small for the scanner to handle? The points range from 14
>> to 23mm, and about 2-3mm thick.
>>
>> I have been able to scan points that are larger about 26 to 35mm in
>> length, 6mm at their widest point and get a successful 3D model out of it.
>> Does anyone have any suggestions?
>>
>> The settings I am using right now are a 360 scan, 14-16 divisions, 3.3
>> thousand points per inch, neutral for colour, and a distance from the
>> scanner of about 9.5 inches. I am covering the scanner completely with a
>> card board box to ensure there is no change in light.
>>
>> Any help or suggestions would be great. I have been trying to make this
>> work for the past 2 months.
>>
>> Thanks,
>>
>> Callie Diduck
>> Master's Candidate
>> Department of Archaeology and Anthropology
>> University of Saskatchwan
>>
>> --
> MORPHMET may be accessed via its webpage at http://www.morphometrics.org
> ---
> You received this message because you are subscribed to the Google Groups
> "MORPHMET" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to morphmet+unsubscr...@morphometrics.org.
>

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[MORPHMET] Re: NextEngine Laser Scanner

[terrielsimmons]

Hi Callie, 

Are you using the old NextEngine or the Ultra? Since you are scanning at a 
small distance, make sure your scan setting is set to macro. Try fewer 
divisions, around 8--too many divisions for small objects causes the 
auto-alignment to not work. The NextEngine also has a hard time aligning 
flat objects, so if the scans don't align within ScanStudio, you might have 
to export them to Meshlab and align them. You can email me directly if you 
want some help with Meshlab.

Terrie Simmons-Ehrhardt

On Friday, November 10, 2017 at 6:25:14 PM UTC-5, Callie Diduck wrote:
>
> Hello, 
>
> I am working with a NextEngine Laser scanner trying to create 3D models of 
> Avonlea Projectile Points for my Masters Thesis. I am having difficulty 
> with the scanner not being about to stitch the individual scans together to 
> create a 3D model. I think I've tried just about everything I can think of 
> to make it work but I still come up short. 
>
> I am wondering if the problem is that the projectile points I am working 
> with are just too small for the scanner to handle? The points range from 14 
> to 23mm, and about 2-3mm thick.
>
> I have been able to scan points that are larger about 26 to 35mm in 
> length, 6mm at their widest point and get a successful 3D model out of it. 
> Does anyone have any suggestions? 
>
> The settings I am using right now are a 360 scan, 14-16 divisions, 3.3 
> thousand points per inch, neutral for colour, and a distance from the 
> scanner of about 9.5 inches. I am covering the scanner completely with a 
> card board box to ensure there is no change in light. 
>
> Any help or suggestions would be great. I have been trying to make this 
> work for the past 2 months. 
>
> Thanks, 
>
> Callie Diduck
> Master's Candidate
> Department of Archaeology and Anthropology 
> University of Saskatchwan 
>
>

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[MORPHMET] Re: symmetrical matrix and matrix of asymmetry

[serg bar]

  Hi all,
There is a question on matrices. If  I do matrix of all configuration  I 
have centroid and all associated with it.
Other way is to prepare separate covariation matrix f.e. matrix asymmetry 
for left landmarks and for right landmarks.
Is such way has an advantage? Or its incorrect?
Thanks,
Sergey



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[MORPHMET] Re: symmetrical matrix and matrix of asymmetry

[serg bar]

четверг, 18 августа 2016 г., 18:58:47 UTC+3 пользователь serg bar написал:
>
> I analyzed some population’s oak tree leaves (object asymmetry). 
> I created covariance symmetrical matrix and matrix of asymmetry in 
> MorphoJ. 
> Does symmetrical matrix signalized on directional asymmetry? 
> If it does, the samples with pure FA (in Procrustes ANOVA , ind * side) 
> really contain undetected DA in symmetrical matrix? 
> If it does not, the samples with pure FA contain what?

-- 
MORPHMET may be accessed via its webpage at http://www.morphometrics.org
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