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Messages - hengefjes

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1
Feature Requests / Re: Thin Dense Point Cloud
« on: January 30, 2017, 12:28:47 PM »
I second that!! Something similar to the SOR-filtre and the subsampling modes in CloudCompare would be fantastic!

2
General / Re: Nice results using a ring flash!
« on: September 24, 2016, 06:16:04 PM »
Sounds very interesting! I hope you post pics of your rig, and results. I've tried different homemade diffusors, and the larger they are the better, but there is a limit to how practical it is when your ringflash is 2-3 feet wide.  ;) There is a very nice fairly affordable chinese ring diffusor on the market thats foldable, but the build quality leaves much to be desired, and its to weak for my use with one of my Nikon SB800 flashes. Very nice for macro work though. https://www.amazon.com/RoundFlash-Universal-Collapsible-Magnetic-Diffuser/dp/B00NQ6UT4W

3
General / Re: Nice results using a ring flash!
« on: September 22, 2016, 05:27:36 PM »
Hi again, everybody!
I got asked the following question in a private message:
Quote
Thanks for your post about using a Ring flash when taking photos for photogrammetry. I was wondering if you could describe your setup in a little bit more detail?

I see you are using the Godox AR400 and a 20mm lens. After some digging on your SketchFab site I think I saw you were using the Nikon D610? Lastly, the cross polarzing technique you are using. Did you buy some linear polarizing film to place over the ring flash, and you were able to cut it to fit?

Thanks a lot for your post, it is encouraging to setup and I just want to make sure I got all the details to try my hand at it.
I'll share my answer here in case someone else want's to know:

My setup:
Camera: Nikon D610 - would rather have a D750 as the D610 spits oil on the sensor when shoothing upwards - the problem stopped at around 25000 shots though. D750 has slightly better low light performance and includes wifi which I find handy in some cases.
Lenses: Nikkor AF-S 20mm f1.8G for large objects and interiors, - for smaller objects I'll use one of these; Nikkor AF 50mm f1.8D, Nikkor AF Micro 60mm 2.8D, Tokina AT-X 100mm f/2.8 PRO D Macro. I used to have the 14-24 f2.8 Nikkor which was fantastic for photogrammetry, but it was just too heavy...
Flash: Godox AR400 with the Godox wireless USB trigger. The trigger will be swiched with a sync-cable to save some weight.

Cross polarization:
With this technique one can minimize the reflection from the flash and avoid glare form shiny surfaces. You light the object with polarized light from the flash. To polarize the flash I ripped the polarizing film off an old broken LCD-screen (all LCD-screens have polarizing film on them), and taped it onto a clear piece of plastic which then was cut to fit the front of the Godox flash. The direct reflections of the polarized light on the object are filtered away with a correctly adjusted regular polarizing filter on the lens. I use a "B+W Circ.Pol.Nano KSM 77mm" on the 20mm. Works great, but steals a couple of stops from your exposures - so don't expect to use this on larger distances than 4-5 feets.

4
General / Re: Nice results using a ring flash!
« on: August 30, 2016, 10:36:29 PM »
I got mine from "godoxstudio" at Ebay.com

Heres the flash and specs:
http://www.godox.com/EN/Products_Camera_Flash_Witstro_AR400_Powerful_Ring_Flash.html

5
General / Nice results using a ring flash!
« on: August 23, 2016, 10:01:44 PM »
Hi all!
I just wanted to share a tip that might come in useful to some of you. I've been working a lot with close range photogrammetry in low light situations, and have grown tired of rigging lights and hauling that tripod around. I even used handheld lights to paint light into the shadows during long exposures - which worked nicely as long as the fundament was sturdy enough to cope with the movement. I bought a Godox AR400 ring flash. It has a built in battery and quite powerful led light for focusing. It enables me to shoot at iso100, f8, 1/200th sec, with my 20mm fx setup, and still get fairly decent exposures at 20 feet distance. The result I get with this setup is by far good enough for my use, - it also makes the shooting process very quick compared to using a tripod. You can find some examples of using the ringflash in my sketchfab gallery: https://sketchfab.com/gunnar/models

6
General / Agisoft Lens -> Adobe Lens Profile
« on: October 05, 2015, 03:35:28 PM »
I'm wondering if it's possible to use the "Agisoft Lens" output to make good distortion correction profiles in "Adobe Lens Profile", and how to, if possible?

7
General / Re: More computers or more power?
« on: December 18, 2014, 06:15:48 PM »
If I have understood the licensing right, you will need one pro-license per processing node - that might affect your priorities.

8
General / Re: Problem Scanning Small Objects
« on: October 08, 2014, 10:18:55 PM »
I guess your object doesn't have enough texture for the software to hang on to. You could try to mix chalk in water - spray it on and let it dry - (or anything else you can think of to give it some texture - play with it with greasy fingers ;-) then take the shots. It won't look as good, but at least the software will have more to work on and you get the 3d-shape. Try another sort object, like for instance a log of firewood.

9
General / Re: Quo vadis, PhotoScan?
« on: October 03, 2014, 10:34:33 PM »
As this is post nr.  10000 in this category,  I certainly hope they continue the same way as theyve done so far,  -  forward.

10
General / Re: Seams not welded merge and combine chuk
« on: September 30, 2014, 10:23:24 PM »
That would be a very nice feature! Maybe you could add that as a "Feature request".

11
General / Re: CPU and GPU benchmarks
« on: September 25, 2014, 05:00:42 PM »
...
In the meantime intel released its new Haswell-E processors.
...
With the cheaper 5930K i could stick with 64GB, maybe even get a better gpu as before.

what would you suggest?
I find my main limit to be available RAM. Many of the x99x-boards have 8 memory slots and will support up to 128GB. I would go with the 5930K and 16GB RAM chips - if they are available soon, so that i could upgrade if needed. I guess Photoscan will benefit from the faster memory-speeds also.

12
General / Re: Agisoft PhotoScan 1.1.0 pre-release
« on: September 24, 2014, 10:46:18 PM »
Hello hengefjes,

And what is the output in the Console pane related to the tile export? In the export tiles dialog you need to specify export resolution, so the model should be properly referenced to fit these units.
Here's the console output:
Finished processing in 0 sec (exit code 1)
grid: 9x7x3 (5 levels)
Preprocessing images...
preprocessing images... done in 0.697 sec
Finished processing in 0.698 sec (exit code 0)
>>>


And what about the export settings and model referencing?
The project is an interior with a local coordinate system. I thought the referencing was ok. I never really paid much attention to referencing, as I've used markers for scaling and external software for orientation - never understood how to work the referencing for my close range scenarios in Photoscan. I guess how to use the viewer will be explained in upcoming manuals - and what its intended to do.

13
General / Re: Agisoft PhotoScan 1.1.0 pre-release
« on: September 24, 2014, 10:39:19 AM »
Hello hengefjes,

And what is the output in the Console pane related to the tile export? In the export tiles dialog you need to specify export resolution, so the model should be properly referenced to fit these units.
Here's the console output:
Finished processing in 0 sec (exit code 1)
grid: 9x7x3 (5 levels)
Preprocessing images...
preprocessing images... done in 0.697 sec
Finished processing in 0.698 sec (exit code 0)
>>>

14
General / Re: Agisoft PhotoScan 1.1.0 pre-release
« on: September 23, 2014, 06:15:21 PM »
Hello hengefjes,

OC3 export works only for dense point cloud. Tile export is also based on dense point cloud and would not work if it is missing in the active chunk.
"Export tiles" lets me choose some options for the export. -> Enter name and location -> A box which says "Processing in progress" shows briefly - then it just says: "Can't export model". Dense point cloud in active chunk is there, - not missing. - Will check out that panorama tutorial :)
Thank you for the quick replies!

15
General / Re: Agisoft PhotoScan 1.1.0 pre-release
« on: September 23, 2014, 05:38:16 PM »
I can't export tiles for use with the viewer. The viewer can't open exported .oc3 files either. Also the Export Panorama function is grey(disabled?). Are there any special conditions that have to be met to use these tools?

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