K2P workshop 3-23-13
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K2P workshop 3-23-13






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  • Why DIY MoCap?Motion capture is now cheap and accessibleNo longer need a giant studioIt’s FAST.Ideal use cases: short-turnaround animation, rapid prototyping etc.
  • Microsoft SDK vs. OpenNI
  • Can add multiple motion tracks and duplicate nullsPin names need to match control nulls
  • 2D vs. 3D: Avoiding the “Uncanny Valley”Awesome glitches

K2P workshop 3-23-13 K2P workshop 3-23-13 Presentation Transcript

  • Kinect Motion Capture for Filmmaking 3/23/13
  • How does the Kinect work? Photo by y3rdua
  • Getting Started: HardwareYou will need:• A Kinect, or generic equivalent such as the Asus Xtion• USB/AC adapter cable, if you have a Kinect that was bundled with the Xbox (don’t buy the Microsoft adapter, the cheap ones work fine)• Enough space to perform
  • Getting Started: SoftwareOpenNI driver bundle:simple-openni.googlecode.comKinectToPin:kinecttopin.com
  • Two competing SDKsOpenNI• Free and open source• Works with all models of Kinect as well as other devices such as the Asus Xtion.• Cross platform – even supports ARM processors and AndroidMicrosoft (official) SDK• More tracking points• Estimates occluded joints and hand/foot rotation• Special case capture modes (seated figure etc.)• Only works with Kinect For Windows – on Windows
  • KinectToPinKinect Motion Capture for After Effects
  • What is KinectToPin? + A standalone motion A UI panel for After Effects capture application
  • Rig 2D character models in 3D
  • “Working Backwards”Traditional Animation Motion Capture Workflow1. Start with scene already 1. Start with full color, full-motion storyboarded and timed out characters2. Create sketches of key poses for 2. Refine blocking and movement; each character add facial animation3. Add in-between drawings for 3. Choose shots and timing of movement edit, add camera moves4. Color and composite characters 4. (Optional) Re-record any in final scene performances that aren’t working
  • “Working Backwards”Think of it like working with raw footage.
  • Character Design2D models in 3D space
  • Why multi-layered characters?Single-layer model: Multi-layered:
  • Design Tips• “Break” your model at every joint.• Build in overlap so joints have room to rotate without disconnecting.• Parts that fall in front of and behind another layer (e.g. the hair of the model at left) should be two layers.• The hands, feet and head can each have multiple elements.
  • CutoutsRaster-based characters drawn or cut out of existing images or photographs.• Work big if you want to be able to zoom in on your characters• When cutting out layers, use “Refine Edge” to smooth your edges and clean up any extra junk that got selected• Clone/heal/paint in portions that will be missing or problematic when the model changes pose
  • Vector-Based CharactersDrawn with math, not pixels. Easier to break into layers – but watch out.• Can be built in Illustrator, Photoshop or with AE Shape Layers• Vector-based characters are not infinitely scalable as you’d expect: rigging with AE’s Puppet Tool generates a mesh at a set resolution.• Building puppets with vector layers adds an extra step: they need to be precomposed before rigging.
  • Motion CaptureRecording with KinectToPin
  • Setting up your space to record 6 – 10 feet
  • Capturing• Record 15-point 3D skeletal tracking data• Capture in sync to dialogue• Remote control with a standard presentation remote• Open source and cross-platform: runs on OpenNI, built in Processing, also works with generic sensors like the Asus Xtion
  • Acting for Kinect• The Kinect can’t record what it can’t see. • Keep your entire body in the camera’s range • Face the camera when capturing • Watch out for occluded joints (sitting down, putting your hands behind your back etc. can cause it to lose the track)• It’s surprisingly good at picking up subtle posture shifts, but not smaller motions like laughter.• Use a different performer for each character if possible
  • Data formats for exportKinectToPin can output quite a few data, but the ones we’ll beusing today are:• XML (Native recording format, no export required)• After Effects 3D Point Controls (CS5.5+)• After Effects 2D Point Controls (CS4+)Tip: Edit KinectToPin’s settings.txt file to choose your outputformats.
  • Lunch.
  • Importing tracking dataNative import or copy & paste
  • Meet the KinectToPin UI Panel.• Create character templates• 2D and 3D setups• Native XML import (SLOW)• Automatically add expressions to smooth tracking data• Automate rigging
  • The Puppet ToolTHREE OR MORE PINS ON ONE LAYER: TWO PINS EACH, MULTIPLE LAYERS:Elbows don’t bend this way. Ow. Rotation with stretch and squash!
  • AE Puppet best practices• Work BIG. Start high-res, scale down in the puppet comp, then scale back up in the project comp (enable Collapse Transformations).• Precompose if you’re using vectors or shape layers• Keep multiple angles of the same character in sync High-res Start big. Character Layers Project Comp End big. Rigging Template
  • Character RiggingUsing the KinectToPin UI panel
  • Retargeting for arbitrary charactershapes
  • It’s easy!Just grab a red control null and move it to the appropriateposition.
  • Quick auto-lip sync1. Select audio layer and choose“Convert Audio to Keyframes.”
  • Quick auto-lip sync2. Alt-click the stopwatch to add an expression. Use thepickwhip to connect the audio keyframes to the mouth animation.
  • Quick auto-lip sync3. Size the audio data to fit. Use this expression: audio = [your audio keyframes]; linear(audio,sourceMin,sourceMax,targetMin,targetMax) Lowest value of source data Highest value of source data Closed mouth (probably 0) Widest possible open mouth
  • One last thought:Embrace the limitations of the format.
  • Further non-K2P toolsFREE COMMERCIALBrekel Kinect iPi Soft Open-source capture for 3D Uses two Kinects to record animation (Windows-only) www.ipisoft.com www.brekel.com NI MateDuik Kinect for OSC/MIDI/Blender Inverse kinematics plugin for AE www.ni-mate.com www.duduf.net
  • Get in TouchVictoria Necewww.victorianece.com@FakeGreenDress