Re: [brlcad-devel] GSoc 2018

[Christopher Sean Morrison]

Would have liked to worked with you more interactively on the proposal, but 
definitely look forward to seeing your patch.

Cheers!
Sean


On Mar 27, 2018, at 10:03 AM, Abhishek Vasudevan  
wrote:

Hello, 
It’s been a while. I submitted the final proposal for gSoc on my idea of point 
clouds with BRL-CAD. Since I started a bit late, I wasn’t able to submit a 
draft proposal and get it reviewed. Nevertheless, I will try to submit a patch 
based on integration with PCL in the upcoming week.

Warm regards,
Abhishek

On Mar 12, 2018, at 2:27 PM, Christopher Sean Morrison  wrote:
Abhishek,

To expand on that, BRL-CAD’s point cloud primitive was implemented years ago 
for a specific short-term need (a relatively straight-forward scanned point 
visualization).  The pnts primitive was added with some structure flexibility 
and input methods but never taken to general feature and isn’t considered a 
published feature (which means it can change as needed).

Design-wise, in my view it’s one of the few entities in BRL-CAD that can 
validly be solid or non-solid, intentionally supporting points with or without 
volume.  The on-disk definition was also set up to support per-point 
orientation (e.g., surface normals) and color, data typically available from 
scanners.  And that’s about where things were left, but the possibilities are 
wide open.

Integrating with PCL would be good with an appropriate plan — especially if it 
helps get to production-quality capability being able to import, display, and 
render massive point clouds with/without colors, radii, and orientation.  From 
there, one of the more useful things to explore would be Smooth Signed Distance 
(SSD) surface reconstruction. That could provide a robust path for fixing 
broken mesh geometries.

Cheers!
Sean


 

On Mar 11, 2018, at 9:22 PM, Abhishek Vasudevan  
wrote:
Hi Daniel,
I was thinking maybe I could integrate the pnts primitive with the PCL library 
to help with the visualization part. I believe a lot of point cloud 
functionalities (Segmentation, filters) can be added easily if we were to use 
PCL. Also, there can be options to open and operate on all formats of point 
cloud files like PCD, PLY ,etc. 

Can you provide me the code/documentation that BRL-CAD uses for the pnts 
primitive? Also, what do you think about using PCL here?

Regards,
Abhishek


On Mar 11, 2018, at 1:10 AM, Daniel Roßberg  wrote:

Hi Abhishek,

I'm sure there are many ways you can contribute here.
I've just looked for the first time at our pnts primitive (beside a small fix for a 
compiler I made there 9 years ago).  I think this was meant with "BRL-CAD has a 
basic point cloud primitive."  And as far as I can see, it has no real functionality 
yet.  Especially, the pnts primitive doesn't describe a 3D solid, which is a problem for 
a software designed to handle 3D solids.  The pnts primitive sketches currently an idea 
of how a point cloud could be handled in BRL-CAD.  E.g., it provides the necessary load 
and save functions and the hooks into the mged and archer GUIs.  This should ease the 
implementation of the real 3D functionality because you don't need to struggle with this 
much any more.

Therefore, if you have an idea of how to bring pnts to live you are welcome.  
Feel free to discuss it here.  Point clouds are often the result from 3D scans 
and a matter of visualization which we want to have in BRL-CAD too.

Regards,
    Daniel

2018-03-09 14:14 GMT+01:00 Abhishek Vasudevan :
Hey guys,
I am a final year undergrad student from India majoring in Information 
Technology. I am currently in Australia as a research student at the University 
of Melbourne as part of an exchange program. I am working on point clouds as 
part of my research here. I’ve learnt quite a lot about point clouds, their 
file formats (PLY, PCD, etc.) and also the Point Cloud Library (PCL). 

I’ve seen the GSoc ideas page and apparently BRL-CAD has a primitive 
implementation of point clouds. Is there any documentation on how to use this 
in BRL-CAD? Also, what ideas do you have mind in improving the performance of 
your point cloud model?

 I have programmed extensively in C,C++ and Python. Is there any way I can make 
a contribution here?

Warm regards,
Abhishek


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Re: [brlcad-devel] [BUG] MGED fails to start from dmenu application launcher or with /dev/null as stdin

[Christopher Sean Morrison]

On Mar 27, 2018, at 10:13 AM, Pronaip via brlcad-devel 
 wrote:

As the title says. I think it should be left up to the user to decide if they 
want to run in interactive mode or not, because trying to guess it will just 
add unnecessary complexity and make things flakier.

Providing /dev/null as stdin isn't failing for me.  Piped input is run as a 
command script, so providing /dev/null as stdin is providing an empty list of 
commands to run.  That's documented and intended behavior.

Piped or redirected input is one of the most useful ways to run mged for 
scripting:

echo "tops" | mged -c moss.g

or

mged moss.g <--
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[brlcad-devel] [BUG] MGED fails to start from dmenu application launcher or with /dev/null as stdin

[Pronaip via brlcad-devel]

As the title says. I think it should be left up to the user to decide if they 
want to run in interactive mode or not, because trying to guess it will just 
add unnecessary complexity and make things flakier.--
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Re: [brlcad-devel] GSoc 2018

[Abhishek Vasudevan]

Hello, 
It’s been a while. I submitted the final proposal for gSoc on my idea 
of point clouds with BRL-CAD. Since I started a bit late, I wasn’t able to 
submit a draft proposal and get it reviewed. Nevertheless, I will try to submit 
a patch based on integration with PCL in the upcoming week.

Warm regards,
Abhishek

> On Mar 12, 2018, at 2:27 PM, Christopher Sean Morrison  > wrote:
> 
> Abhishek,
> 
> To expand on that, BRL-CAD’s point cloud primitive was implemented years ago 
> for a specific short-term need (a relatively straight-forward scanned point 
> visualization).  The pnts primitive was added with some structure flexibility 
> and input methods but never taken to general feature and isn’t considered a 
> published feature (which means it can change as needed).
> 
> Design-wise, in my view it’s one of the few entities in BRL-CAD that can 
> validly be solid or non-solid, intentionally supporting points with or 
> without volume.  The on-disk definition was also set up to support per-point 
> orientation (e.g., surface normals) and color, data typically available from 
> scanners.  And that’s about where things were left, but the possibilities are 
> wide open.
> 
> Integrating with PCL would be good with an appropriate plan — especially if 
> it helps get to production-quality capability being able to import, display, 
> and render massive point clouds with/without colors, radii, and orientation.  
> From there, one of the more useful things to explore would be Smooth Signed 
> Distance (SSD) surface reconstruction. That could provide a robust path for 
> fixing broken mesh geometries.
> 
> Cheers!
> Sean
> 
> 
>  
> 
>> On Mar 11, 2018, at 9:22 PM, Abhishek Vasudevan > > wrote:
>> 
>> Hi Daniel,
>>  I was thinking maybe I could integrate the pnts primitive with 
>> the PCL library to help with the visualization part. I believe a lot of 
>> point cloud functionalities (Segmentation, filters) can be added easily if 
>> we were to use PCL. Also, there can be options to open and operate on all 
>> formats of point cloud files like PCD, PLY ,etc. 
>> 
>> Can you provide me the code/documentation that BRL-CAD uses for the pnts 
>> primitive? Also, what do you think about using PCL here?
>> 
>> Regards,
>> Abhishek
>> 
>> 
>>> On Mar 11, 2018, at 1:10 AM, Daniel Roßberg >> > wrote:
>>> 
>>> Hi Abhishek,
>>> 
>>> I'm sure there are many ways you can contribute here.
>>> I've just looked for the first time at our pnts primitive (beside a small 
>>> fix for a compiler I made there 9 years ago).  I think this was meant with 
>>> "BRL-CAD has a basic point cloud primitive."  And as far as I can see, it 
>>> has no real functionality yet.  Especially, the pnts primitive doesn't 
>>> describe a 3D solid, which is a problem for a software designed to handle 
>>> 3D solids.  The pnts primitive sketches currently an idea of how a point 
>>> cloud could be handled in BRL-CAD.  E.g., it provides the necessary load 
>>> and save functions and the hooks into the mged and archer GUIs.  This 
>>> should ease the implementation of the real 3D functionality because you 
>>> don't need to struggle with this much any more.
>>> 
>>> Therefore, if you have an idea of how to bring pnts to live you are 
>>> welcome.  Feel free to discuss it here.  Point clouds are often the result 
>>> from 3D scans and a matter of visualization which we want to have in 
>>> BRL-CAD too.
>>> 
>>> Regards,
>>> Daniel
>>> 
>>> 2018-03-09 14:14 GMT+01:00 Abhishek Vasudevan >> >:
>>> Hey guys,
>>> I am a final year undergrad student from India majoring in Information 
>>> Technology. I am currently in Australia as a research student at the 
>>> University of Melbourne as part of an exchange program. I am working on 
>>> point clouds as part of my research here. I’ve learnt quite a lot about 
>>> point clouds, their file formats (PLY, PCD, etc.) and also the Point Cloud 
>>> Library (PCL). 
>>> 
>>> I’ve seen the GSoc ideas page and apparently BRL-CAD has a primitive 
>>> implementation of point clouds. Is there any documentation on how to use 
>>> this in BRL-CAD? Also, what ideas do you have mind in improving the 
>>> performance of your point cloud model?
>>> 
>>>  I have programmed extensively in C,C++ and Python. Is there any way I can 
>>> make a contribution here?
>>> 
>>> Warm regards,
>>> Abhishek
>>> 
>>> 
>>> --
>>> Check out the vibrant tech community on one of the world's most
>>> engaging tech sites, Slashdot.org ! 
>>> http://sdm.link/slashdot 
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>>> BRL-CAD Developer mailing list
>>>