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XROMM
  • Table of Contents
  • Introduction to XROMM
  • Model Generation
    • Model Generation: Creating 3D models using Amira software
    • Model Generation : Creating 3D models with Horos
    • Model Generation : Creating 3D models with 3D Slicer
    • Model Generation : 3D Marker Models with Horos
    • Model Generation : Cleaning up 3D models with Geomagic
    • Model Generation : Cleaning 3D models with MeshLab
    • Model Generation : Measure CT Marker Coordinates in Maya
  • Animate Bones and Markers
    • Animate Bones and Markers : Importing mesh models into Maya from Horos
    • Animate Bones and Markers : Animate Bones in Maya
    • Animate Bones and Markers : Check Your Animation with MayaCams
  • Maya Analysis and Visualization
    • Maya Analysis and Visualization : Working with joint coordinate systems (JCS)
    • Maya Analysis and Visualization : Measuring and exporting the distance between two points
    • Maya Analysis and Visualization : Measuring XYZ Coordinates of a Point Over Time
    • Maya Analysis and Visualization : Parent a camera to a reference bone
    • Maya Analysis and Visualization : Relative Motion
  • Scientific Rotoscoping
    • Scientific Rotoscoping : Recreate X-Ray cameras in Maya
    • Scientific Rotoscoping : Scientific Rotoscoping in Maya
      • Scientific Rotoscoping : Pan and Scan tools for Rotoscoping
    • Scientific Rotoscoping : Animating a Bone with One or Two Markers
  • Tips and Tools
    • Tips and Tools : Open Maya files from a newer version with older versions
    • Tips and Tools : Precision testing using frozen cadavers
    • Tips and Tools : Import XYZ points into Maya
  • XMAPortal User Manual
    • XMAPortal : Getting Started with XMAPortal
    • XMAPortal : How to Create a New Study
    • XROMM : How to Modify Study Metadata
    • XROMM : How to give access or revoke access to see your study
    • XMAPortal : Data Organization
    • XMAPortal : Metadata Pool
    • XMAPortal : How to Create Trials
    • XMAPortal : How to edit an existing trial
    • XMAPortal : How to upload files
      • XMAPortal : Clearing your browser history
      • XMAPortal : Changing how Java applet connects to the network
      • XMAPortal : Show Firefox developer window
    • XMAPortal : Hide Files
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  • Some useful preparations before you start rotoscoping:
  • Rotoscoping

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  1. Scientific Rotoscoping

Scientific Rotoscoping : Scientific Rotoscoping in Maya

PreviousScientific Rotoscoping : Recreate X-Ray cameras in MayaNextScientific Rotoscoping : Pan and Scan tools for Rotoscoping

Last updated 5 years ago

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Some useful preparations before you start rotoscoping:

  • Each object in Maya is moved relative to its pivot (A). This pivot is usually in an inconvenient location when imported from a CT scan. It is best not to change the CT pivot, but rather to create an animation pivot for rotoscoping. But if you wish to change the location of the pivot, select the translate tool (labeled C in image above), press and hold D on your keyboard and move the pivot, or select Modify/Center Pivot from top menus.

  • To create an animation pivot, select Create -> Locator from the top menus. Move the locator to the point on/in the bone around which you would like it to pivot. Select the bone and then the locator. Press P to parent the bone (child) to the locator (parent). Now rotoscope by selecting the locator and not the bone. The locator will contain the animation curves for your bone.

  • Remove the wireframe (green grid around the bone contours), go to Window -> Settings / Preferences -> Preferences -> Display. Select: Wireframe on shaded: none.

  • Hot keys are W (translate) and E (rotate).

  • Use Window/Animation Editor/Graph Editor to see 6 DOF animation curves (with your animation locator selected)

  • Now lock the bone so you do not accidentally move it relative to the animation pivot.

    • Press button in farthest right top corner of the Maya window to open Channel Box/Layer Editor (if it is not already open)

    • Select your bone in the hypergraph (not the locator)

    • Shift-select the three Translate, Rotate and Scale attribute names (the words), then right click and select Lock Selected (image below)

Rotoscoping

  • Use . This is a tool in the XROMM toolshelf, which allows you to Pan, Scan, Rotate, and Drag the camera view while you are rotoscoping.

  • Start with a frame at the beginning of the animation sequence, and move the bone (via its animation pivot), with translate and rotate tools so it lines up with the xray bone displayed in the xray camera.

  • Making the bone a bright color (e.g. green or pink) and semi-transparent can make rotoscoping easier.

  • Once you are satisfied with the alignment of the bone, press S on your keyboard. This sets a Key Frame in the animation, which means Maya marks the characteristics of the bone at that moment. A red line should appear in the animation bar at the bottom of the screen.

  • Move forward 5 or 10 frames, and repeat the process again.

  • Make sure to always press S before changing frames.

  • Maya will interpolate between the Key Frames, filling in your whole animation. Depending on your animation, you may wish to go back and tweak some of the intermediate frames.

Pan and Scan Tool for Rotoscoping
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