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Messages - Alexey Pasumansky

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General / Re: forest alignment problem. HELP
« on: November 25, 2011, 12:01:02 PM »
Hello bagus,

Do you have camera position data for the small sample set you have provided?

General / Re: Is photoscan professional right for me?
« on: November 22, 2011, 03:16:03 PM »
Hello James,

Sorry for the inconvenience.

We can send you a 30-days trial key so you can evaluate the results based on your data. Please send an inquiry to so we could provide you with trial key.

Here is an example of the facade export of the building-tutorial dataset (the orthophoto plane was set by markers placed in the corners of front windows):

Feature Requests / Re: Blank texture areas
« on: November 21, 2011, 05:57:52 PM »
Hello Chad,

Export orthophoto has "Fill holes"feature to fill such areas on the exported planes.

We are planning to add similar option to Build texture dialog soon (unlikely it will be added in 0.8.4 release, but I think that it will appear in 0.8.5).

General / Re: Geometry Accuracy Calculations/Validation
« on: November 21, 2011, 05:50:29 PM »
Hello Tyler,

Total error in Ground Control dialog box is calculated as square root from the sum of squares and that's all is divided by the number of GCPs. Maybe the difference you've got could be caused by division by (n-1).

As for the unchecked GCPs - their coordinates are not taken into account when coordinates of the model are assigned. You can see the change of the errors clicking Update button after checking/unchecking GCP.
But if you are sure in coordinates and accuracy of the GCPs but the error is still high that usually mean that the model has deformations which could be compensated by using Optimize feature (in 0.8.4).

General / Re: Problems Building Geometry
« on: November 18, 2011, 05:50:31 PM »
Hello Tyler,

On the first screen it seems that you have quite a number of photos taken from the same position (disabled on the picture). It is not good for PhotoScan and may cause unwanted effects and artifacts.

General / Re: Importing Photos w/ masks and GCP's from another project file
« on: November 18, 2011, 05:42:18 PM »
Hello Tyler,

You can keep both masks and GCPs if you merge the chunks. Previously you should use Append command in File menu to open your projects in one workspace.
If the chunks are referenced merging option will be available from Workflow menu. But I think you should rename markers if you do not want to confuse them (or check Merge markers option if you have markers in the same locations).

General / Re: Question about exported data (cameras)
« on: November 18, 2011, 05:19:02 PM »
Hello DevDoctor,

Could you please describe the task you are trying to solve?
If you need cameras with associated photo planes for manual geometry reconstruction isn't it possible to load camera positions and corresponding images in 3DMax?

We can provide you several export samples if you specify the formats and/or goal you're trying to achieve, because I doubt that understood you correctly.

General / Re: Improving chunk alignment
« on: November 18, 2011, 05:01:09 PM »
Hello Patrice,

We are working on improvement of the chunk's align functionality, but no changes about that are expected in 0.8.4.

Hello Peter,

1) Yes, these coordinates are world coordinates if the model is georeferenced.

2) This matrix is camera rotation matrix. Using it you can transform vector from camera coordinate system into world's coordinates. M x Vc = Vw (M - camera rotation matrix, Vc - vector in camera's coordinates, Vw - vector in world's coordinates).

3) 4x4 matrix in PhotoScan XML is row-major just as you've written.

General / Re: DEM Exporting Validity
« on: November 16, 2011, 04:59:29 PM »
Hello Tyler,

I think we'll consider your suggestion. Thank you.

General / Re: DEM Exporting Validity
« on: November 16, 2011, 04:11:21 PM »
Hello Tyler,

DEM export in PhotoScan takes into account only the maximum Z value for each pair of X,Y (if exporting in real world coordinates - Geographic tab in the Export DEM dialog). So the resulting DEM will contain only the rock but not the area under it that is not seen on the first picture.
In general selecting planar projection planes works in the same way.

General / Re: Accuracy of Point Cloud Changed?
« on: November 16, 2011, 04:06:38 PM »
What I am saying here is that I was doing the exact same "align photos" step for the exact same photos in the exact same project, but I ended up getting different results.

Yes, it is possible. Due to some uncertainties you can get a little bit different result even re-aligning the same set in the same PhotoScan session. The value of the possible difference mostly depends on the positions of the images in the data-set.

General / Re: Accuracy of Point Cloud Changed?
« on: November 16, 2011, 03:06:03 PM »
Hello Tyler,

Align Photos step could produce slightly different results.

The difference in the Error column could be considerable if you process for example one line of aerial photos that have only one-dimensional overlapping. If the set of data has overlapping in two dimensions the values in the error column would not vary much while performing align photos.

General / Re: crop of invalid DEM
« on: November 16, 2011, 02:02:48 PM »
Hello Kjellis,

This feature removes all the additional faces that are build in Smooth mode leaving only those that are seen from at least two cameras.

In the next update we are going to implement feature that allows to define manually the number to stand instead of ~32000. Some GIS-packages do have the option to disable specified numbers.

Hello Peter,

Yes it is 4x4 matrix in .xml file  that is a result of a multiplication of Rotation, Translation and Scale matrices.

To get camera positions in world or local coordinates you can for example export cameras (using Export Points command) to Omega-Phi-Kappa format. It also contains information about rotation matrix.

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