3D tracking mismatch with Houdini (fusion 16)

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matevil
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3D tracking mismatch with Houdini (fusion 16)

#1

Post by matevil » Tue Sep 10, 2019 3:42 am

Hi there,

I'm relative new in this forum and usually I'm working on FX in Houdini and not in Fusion, but now I came back on it for create a fast tracking and after see more video tutorial on this subject I open one discussion here because I got a strange issue. So...

here you can download the fusion files, sequences and FBX
http://www.art2upz.com/test_bridge.zip

I create also one example with I can share with you. Essentially I create a tracking on Fusion, 3D Camera and some reference geometry.
When I import in Houdini (same range and FPS) I tried:

  • to apply the sequence inside the camera like background - mismatch

Image

  • apply the sequence on plane generated by fusion before - works

Image

I render some geometry and when came back on Fusion for composition all is wrong! why???

Image

I attached also some images for help to understand better.

This is the tracking create by Fusion before export in FBX

Image

Thanks and have a nice day
Matteo


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matevil
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Re: 3D tracking mismatch with Houdini (fusion 16)

#2

Post by matevil » Wed Sep 11, 2019 1:51 pm

maybe I found a way for fix it. There are always a few mismatch but I think because the tracking is not 100% correctly, anyway the solution is in the value of camera inside Houdini should be change the aperture like the value of Fusion because this parameter doesn't take correctly when export and import.

Mat


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Midphase
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Re: 3D tracking mismatch with Houdini (fusion 16)

#3

Post by Midphase » Wed Sep 11, 2019 9:59 pm

This is an issue since for some bizarre reason Fusion measures the FilmBack value in inches whereas Houdini does in the proper mm value.


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SirEdric
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Re: 3D tracking mismatch with Houdini (fusion 16)

#4

Post by SirEdric » Sat Sep 14, 2019 11:35 am

Midphase wrote:
Wed Sep 11, 2019 9:59 pm

FilmBack value in inches whereas Houdini does in the proper mm

Not sure if there's a 'proper' way to measure them. Both imperial and metric values are used in different locations of this planet....:-)


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Midphase
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Re: 3D tracking mismatch with Houdini (fusion 16)

#5

Post by Midphase » Sun Sep 15, 2019 11:53 pm

Awww, come on man. Photography has always relied on mm and motion cinema adopted that standard. I have never heard of anyone shooting on Super 1.37795....have you?