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Adjusting optics in 3D footage

873 Views 8 Replies Latest reply: Mar 8, 2007 9:35 PM by Bojan Landekic RSS
Lars Wikstrom Calculating status...
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Feb 7, 2007 7:27 PM
I bought SynthEyes to get a 3D track for import into Cinema 4D. I then rendered out my CG animation and need to combined the video and the CG footage. The problem that I am having is that the stuff shot on my video camera has a slight lens distortion and my CG stuff does not. I need to add lens distortion to the CG stuff to match the video and help it from slipping. I have After Effects and Shake and many people have told me to use Shake because it is better suited for it. I’m no expert at shake yet so a helping had as to where to start would be great. Nodes and so on to complete this task.

Thanks!

-Lars
G5 Dual 2.5, Mac OS X (10.3.6), 1ghz laptop
  • Zebulun Level 5 Level 5 (6,745 points)
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    Feb 8, 2007 5:06 AM (in response to Lars Wikstrom)
    if you look in the warp tab, a number of nodes spring to my mind: iDisplace, LensWarp, PinCushion.

    are you asking for instruction on how to use shake? there's a good tutorial book and great manual in the software box.

    zeb
    3 antiques from the PowerPC age and 4 bicycles. 1 Dell 24" widescreen monitor, Mac OS X (10.4.8), In a handbasket traveling towards.......
  • Bojan Landekic Level 1 Level 1 (0 points)
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    Mar 2, 2007 11:06 PM (in response to Lars Wikstrom)
    Since lenses don't change much once they are produced, is there a lens optics database that can be accessed to retrieve various lens specifications, and files that can be applied to software such as shake, nuke, Maya, Truespace, or similar reality altering software?

    A useful example would be someone in the field stating they have footage from a specific model of a camera, and the in-house team can pre-render footage, apply the appropriate filter from the lens optics database, and both can send shots to an editor independent of each other and the footage will match almost perfectly?

    Unless lenses used change their formfactors faster than their particles such a database could potentially expedite the processes of almost every film maker.
    iMac G3 233, Mac OS 9.1.x
  • Zebulun Level 5 Level 5 (6,745 points)
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    Mar 3, 2007 2:55 AM (in response to Bojan Landekic)
    that's an interesting question. i can affirm that tv lens manufacturers such as canon and fujinon do have lens files for their various lens and these files can be used by tv studio, eng and efp cameras. what i don't know is what sort of format these files are written in. i also do not know if film cameras can utilize any sort of lens file. interesting question.
    3 antiques from the PowerPC age and 4 bicycles. 1 Dell 24" widescreen monitor, Mac OS X (10.4.8), In a handbasket traveling towards.......
  • dekekincaid Level 1 Level 1 (65 points)
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    Mar 5, 2007 2:36 PM (in response to Lars Wikstrom)
    Always shoot grids with lenses. Then you can create your own unwarp nodes for that specific lens. The trouble is that lenses are made on earth under gravity and each one is slightly different.
    powerbook g4 17", Mac OS X (10.4.8)
  • Bojan Landekic Level 1 Level 1 (0 points)
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    Mar 5, 2007 5:36 PM (in response to dekekincaid)
    Then let's start producing lenses off Earth! Would that solve the problem?

    Though, aren't there simply minor variances within the same lens types, even though they differ due to gravity and other forces? Would it be useful if there were a, sort of a, Technics approach to it. For example, a database of standard lens parameters that all filmographers, effects, and other crews could reference, and then there would be minor adjustments, +-12% or something?
    iMac G4 350, Mac OS X (10.3.9)
  • dekekincaid Level 1 Level 1 (65 points)
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    Mar 8, 2007 1:27 PM (in response to Bojan Landekic)
    For example, a database of standard lens parameters
    that all filmographers, effects, and other crews
    could reference, and then there would be minor
    adjustments, +-12% or something?


    Sure, but there are a lot of different lenses out there even without accounting for the variation between the same type. Also now with the lovely invention of the digital camera everything is different depending on which one your shooting with. Different sensor sizes, crop sizes, anamorphic, pixel aspect ratio, etc... Atleast with 35mm, it was limited to only a few different types.

    In vfx we are lucky to even find out what lens they shot with in the first place, let alone getting grids

    -deke
    powerbook g4 17", Mac OS X (10.4.8)
  • Bojan Landekic Level 1 Level 1 (0 points)
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    Mar 8, 2007 9:35 PM (in response to dekekincaid)
    Do you know of any undertakings as the one I have described for consumer miniDV models so I don't have to waste my life gridding and shaking!

    Is there a plugin for iMovie/FCP that does tihs?
    iMac G4 350, Mac OS X (10.3.9)

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