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1 Tutorials LightWave 3D Export Aura [2] Pixel Tracking to LightWave em Qua Jan 26, 2011 2:12 am

Admin

avatar
Admin
by Olivier
Michon


In this tutorial, we will show how powerful the
combo of Aura [2] + LightWave® [6.5]
is to add tracking to LightWave.
Step 1 - Aura:


  • Load the sequence you want to track into
    Aura ( Make sure the Pre-Load option is ON).
  • Here, we will use the 60 first frames of CarSide.AVI located
    on the AuraContentAnims from the Aura CD.
  • Open the Filters > Motion > Pixel
    Tracker
    panel.
  • At frame 0, set up some suitable parameters
    for the Pixel Tracker to achieve a nice wheel
    tracking.
  • Define the closest track area and the appropriate
    search area assuming the track area could not
    be out of the search area when you go to the
    next frame.
  • Set Reference to Dynamic if
    the tracked area is changing a lot.
  • Then, select the RGBA channel where you
    have the best contrast.
  • Finally, define the appropriate sub-pixel
    accuracy depending on the kind of motion and
    the precision you want to achieve.

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  • Now, use Select All to select all
    of the frames in the layer, then apply the
    filter to perform the track.
  • To export the motion file to LightWave® open
    the Path Manager panel. You can do this
    through theMotionmenu on the
    Pixel Tracking panel or through Filters->Motion->Path
    Manager
    . Select the path you've just tracked.
    Choose File->Export to LW Motion.
    Name it wheel_track.mot.
  • Make sure the Reverse Y is ON in
    the first tab, and Image Ratio, located
    in the second tab should also be ON to
    get the proper path in LightWave®. We want
    to export the motion information so leave the
    Motion option checked on the Channels tab.
    Once this is set, hit Export to save
    the file.







  • What we have to do now is to prepare an
    image in which we will copy the tracked area
    of the first and last frame in the same single
    frame.
  • For that, use the Circle Select tool to
    isolate the tracked region on the first frame.
  • Inverse the selection, then clear it. Do
    the same for the last frame in the sequence.
  • Now, copy the last image to a new layer,
    then move this layer at time 0, so that it
    matches the first frame of the sequence.
  • Merge the two layers, then export the first
    frame as BG_layout .tga.
    It should result the following image.





  • This image will help us to lock the camera
    at the right place so that the object that
    will receive the path would match the sequence,
    but this is the next step.

Step 2, LightWave®:


  • Launch Layout.
  • Add a Null object named start_Null,
    then load the motion file wheel_track.mot as
    its motion.
  • Clone this Null object and rename it end_Null.
  • Open the Graph Editor to modify the end_Null object
    motion.
  • Select all end_Null.Position channels,
    then select all keys except the last one.
  • Delete the selected keys and move the only
    resulting key at frame 0. It should result
    the following image:





  • Now, load the BG_layout .tga file
    and use it as a Background image.
  • Display the Background image in the Camera
    View Background (from the Display Options panel).
  • You have to set the proper Lens Focal
    Length
    to match the real camera
    lens.
  • Then in the Camera View, move the Camera
    to match the start_Null and the end_Null on
    the corresponding tracked areas of the Background
    image.

  • In this example, it should be around :
    <blockquote> X = 0 m
    Y = 0 m
    Z = -1.2 m

    Note: If you have set the
    origin of the path to the center of the screen
    (default setting), you should have to move
    the camera only on Z axis.</blockquote>
  • Now, replace the BG_layout .tga by
    the CarSide.AVI and the start_Null object
    will match the wheel position just like the
    Pixel Tracker does in Aura.
  • To add a particle effect at the contact
    point between the wheel and the road, you just
    have to add an additional Null object parented
    to the start_Null, to create
    an offset between the center of the wheel and
    its base, then put an FX_emitter on this new
    Null object.
  • You may have to adjust this offset during
    the animation due to the perspective deformation.



MPEG
Movie - Two Pixel
Tracks Plus Particles

Enjoy !
]

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