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Messages - SimonBrown

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Python and Java API / Re: Newbie - error running a script.
« on: April 23, 2017, 12:01:21 PM »
Hi Alexey - here's the output:-

Out[1]: 2017-04-23 10:00:35 PySide2.QtWidgets.QDial

Python and Java API / Re: Newbie - error running a script.
« on: April 22, 2017, 09:32:43 PM »
Hi Alexey - yes the entire script including the line you mention.

The error occurs very soon on loading, triggered on the very line you refer to I believe.

Python and Java API / Newbie - error running a script.
« on: April 13, 2017, 08:01:55 PM »
Having recently upgraded to I now find the following script:-

This script is really, really useful. Its a godsend for larger models such as this one:-

Created over 6 or 7 dives and now has nearly 10k images.

However, running the script triggers the following errors in the console:-

2017-04-13 17:47:31     class SplitDlg(QtWidgets.QDialog):
2017-04-13 17:47:31 NameError: name 'QtWidgets' is not defined

Can anyone suggest a fix for this one? its making me tear my hair out!

General / Re: Nikon D600 or D700
« on: May 30, 2016, 10:55:06 AM »
I use a housed D700 underwater. This has two issues; low light and particulates in the water that when lit with flash cause an effect called backscatter.

The D700 is not a current model, but has excellent high ISO characteristics and I regularly use ISO 1600  or 2000 to scan a site. The main benefit of high ISO is less flash power...which in turn means less backscatter.

And high ISO means you can shoot with torchlight instead of a flash gun.

An example lit with an Orcalight Seawolf torch:-

An example lit with underwater flash guns:-

An example of mixing both. The Abbot self propelled gun and Stalwart are lit with flash. The aircraft and Saracen lit with the Orcalight Seawolf. Four separate dives weeks apart, two divers and two different cameras were combined in this model.

So I would say the D700 is fine and has one significant advantage; its not a current camera and in spite of being very capable tool can be bought for a fraction of what the current cameras cost.

General / Hosting and Publishing Orthophotos
« on: April 24, 2016, 06:24:31 PM »
So I have generated a few orthophotos of some underwater 3D models.

The results are very impressive, and worthy of publication, but both Mpabox and 4DMapper (the two API-ready hosts that come with Photoscan Pro) are really geared around GPS/mapping.

Mixing underwater and GPS is possible (and we are working on it) but in absence of GPS data, is there anywhere that hosts orthophotos in a way that makes a 139Mb JPEG orthophoto actually usable by the general public?

Sample models:-

Looking forward to the replies.

General / Re: underwater photos don't align
« on: March 06, 2016, 12:07:33 PM »
The photos are reasonably sharp and in focus (as far as underwater photos go…). I am using a point in shoot camera with an automatic ISO setting (it varies I believe based on the lighting conditions).

As others have said, overlap is critical. And a well exposed & lit image will be as sharp as anything taken on the land...

I have just run some material off of a Gopro video through Photoscan. The biggest issues was a lack of sharpness (low light/slow shutter/fast panning) in some frames resulting in a lack of images that overlapped and were technically acceptable.

Do you have a subset of the images that do align? If yes, then perhaps have a look at those and compare them to what does not?

Without overlap there is nothing to be recovered, so another dive is probably in order.

General / Re: underwater photos don't align
« on: February 29, 2016, 02:35:06 PM »
The camera and lens combination I use underwater isn't calibrated either, but the resulting images do align.

So I do not think the issue is with calibration.

Are you applying any post-shoot manipulation to the images?

What ISO are you working at when shooting the images?

Are the images in sharp focus?

Feature Requests / Size of Marker ID text
« on: November 30, 2015, 07:16:34 PM »
When using Photoscan Professional -> Tools -> Markers -> Print Markers.

Relative to each printed Marker there is a number that can be used to ID the marker. Relative to the printed marker, the printed number is quite small.

Would it be possible to allow users to set a preference that controls the size of the text printed alongside the marker?

General / Re: Adding thickness to model
« on: September 09, 2015, 10:49:31 AM »
Thanks to all who replied on & off the forum.

Model is now thickened and printing...meshmixer did the job.

General / Adding thickness to model
« on: September 04, 2015, 10:51:53 AM »
We are now printing in plastic the first 3D models of underwater artefacts and shipwreck remains, and the exported STL files from Photoscan are coming out very well indeed.

But the actual printing process can struggle with models with a greater level of texture/detail, and its necessary to build a printed frame around the model to help it build. Here's an example:-

And the model itself:-

So ideally what I would like to do is add thickness to the surface in one direction only (the seabed side in this case) that will help the model build.

Has anyone found a tool or application that will add thickness to a surface? This is more in the realm of 3D CAD perhaps, but hoping someone here might be able to help?

General / Re: Aligning huge projects
« on: July 30, 2015, 12:18:37 PM »
I have just finished a 900+ camera model of an underwater wreck.

A certain section of the wreck would align but not include the dense cloud to cover that area, so in the end I used two separate chunks and merged them.

But its worth noting that both chunks needed manual trimming of faces/polygons to tidy up the joining surfaces before merging the models. Use the Rectangle/Circle/Free-Form selection tools and then delete the polygons.

Result is here:-

General / Re: Mesh area report with zero thickness - correct value?
« on: April 23, 2015, 12:01:15 PM »
Many thanks Alexey - thank you for confirming.

General / Mesh area report with zero thickness - correct value?
« on: April 23, 2015, 09:56:09 AM »
Good morning. I'm new here so I'm asking a newbie type question...

I have mapped an underwater shipwreck site and gone through the workflow in PhotoScanPro to derive what I think is a really good model:-

So in my model the mesh has zero thickness. Area and volume report 1622.59m2 and zero respectively.

But am I correct in thinking that 1622m2 is counting both sides of the mesh? To get the correct value of area of mesh a simple 1622/2=811m2 would give the value of a single side?

Based on my gut feeling about the size of the wreck site, I think yes...but always prefer to know rather than guess...

Secondly, I have generated a report for the model and one value has caught my eye:-

Coverage area: 0.00115897 sq km, or 1158.97m2

There is some variance between mesh area and coverage. I am guessing that the mesh includes any vertical (or angled) faces and coverage is a true projection? In other words, if you flattened the mesh out its area would be bigger than the area it covers. This would explain why the mesh area is greater than the coverage...but then raises doubts over mesh area being both sides...

I hope the above makes sense.

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