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Lens Distortion and CG workflow...

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last69

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  • Joined: Wed Jan 24, 2018 10:14 am
  • Real Name: Cyrille le Folgoc

Lens Distortion and CG workflow...

PostWed Jan 24, 2018 10:29 am

Hello everybody,
i'm working on a project mixing Matchmoved sequence and CG object.
In order to follow the good workflow as this one :

Image

I would like to know which tool is used in fusion to do the distort on the CG from a "STMAP" coming from PFTRACK which is green and Red.

i tried with the Vector Distortion but it doesn't do the job.
i tried like in this tuto "STMap roughcut" with the displace tool but the expression used isn't working...
1/Input.Width

can u explain me ur workflow ?
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Jed Mitchell

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Re: Lens Distortion and CG workflow...

PostThu Jan 25, 2018 4:12 am

I have not personally gotten ST Maps to work in Fusion, I remember reading a while back that there was some issue where Fusion expected / generated ST maps with a different range of values than other apps and you could normalize imported maps, but this is all a super vague memory.

If you're coming from PFTrack you can use PFBarrels with the LensDistort node though, those seem to work fine right out of the box.
"It's amazing what you can do when you don't know you can't do it."
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Theodor Groeneboom

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Re: Lens Distortion and CG workflow...

PostThu Jan 25, 2018 8:13 am

-
Last edited by Theodor Groeneboom on Fri Jan 26, 2018 8:29 pm, edited 1 time in total.
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Sander de Regt

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Re: Lens Distortion and CG workflow...

PostThu Jan 25, 2018 8:55 am

Syntheyes exports Fusion comps with something that to me looks like ST maps (they're tiff files with a nice green/red/yellowish look when viewed in RGB. That map is fed into a Custom Tool with settings that undistorts the image, when you're done a very similar map/custom tool redistorts everything again.
I don't know if PFtrack and Syntheyes' maps are compatible but you should be able to adapt one to the other.
Sander de Regt

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The Netherlands
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Vladimir LaFortune

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Re: Lens Distortion and CG workflow...

PostThu Jan 25, 2018 9:19 am

If you are using PFTrack there is no need to export ST-Maps, just use LensDistortion node pick PFTrack under Lens Distortion Model tab, click Load Distortion Data and load .pfb

Works everytime.

Unless you really need ST-Maps for something else.
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last69

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  • Real Name: Cyrille le Folgoc

Re: Lens Distortion and CG workflow...

PostFri Jan 26, 2018 1:30 pm

Ok thanks to every one. So i think i'll have to wait for the tracker men to be back... And i will try with the .pfb instead of trying to match it for the best at the hand.
I leave the shot on the side for the moment and i'll tell you after.
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Robert Siebert

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Re: Lens Distortion and CG workflow...

PostSat Jan 27, 2018 10:48 am

Hi there - this SynthEyes to fusion workflow works also with PFTrack, the ST maps is the same ....



or this one for Maya and PFTrack

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