# what are the command line arguments to run FirstReconstruction.exe

**URL:** https://discourse.itk.org/t/what-are-the-command-line-arguments-to-run-firstreconstruction-exe/2482
**Category:** Uncategorized
**Created:** [December 6, 2019, 8:41pm UTC](https://discourse.itk.org/t/what-are-the-command-line-arguments-to-run-firstreconstruction-exe/2482 "2019-12-06T20:41:56Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![sag](https://discourse.itk.org/user_avatar/discourse.itk.org/sag/32/2041_2.png) [@sag](https://discourse.itk.org/u/sag)
#### Post date: [December 6, 2019, 8:41pm UTC](https://discourse.itk.org/t/what-are-the-command-line-arguments-to-run-firstreconstruction-exe/2482/1 "2019-12-06T20:41:56Z")

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Hi,

thanks for the help it worked. I have been struggling with the file format for example firstReconstruction in rtf examples. I managed to build it.  
it seems that I have to run it as follows:

FirstReconstruction.exe outputimage.xxx outputgeometry.rtk  
question: what would be the format for output image.xxx?  
secondly is that correct to set geometry file format to .rtk?  
thirdly, it seems that the output image is a 3D image I assume! but how to view this image?

Regards,  
sag

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### Author: ![simon.rit](https://discourse.itk.org/letter_avatar_proxy/v4/letter/s/f08c70/32.png) [@simon.rit](https://discourse.itk.org/u/simon.rit)
#### Post date: [December 9, 2019, 1:29pm UTC](https://discourse.itk.org/t/what-are-the-command-line-arguments-to-run-firstreconstruction-exe/2482/2 "2019-12-09T13:29:52Z")

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I have added an example command line on the wiki, [here](http://wiki.openrtk.org/index.php/RTK_wiki_help#Tutorial_0_-_Building_a_HelloWorld_application_with_RTK). The first argument is an output file name for the reconstructed image and the second argument is an output file name for the geometry xml file.  
I hope it helps,  
Simon