MATCH MOVING

CG car replacement-FastFive

Cinematic technique Match Moving is a Technique that makes insertion of computer generated graphics into a live action footage possible with correct position,scale and orientation according to the related motion.

why we do that?

Animated 3d effects or graphic (three dimensional character or effects) insertion into live            footage.

• save money--F16 flying footage required  into your scene..can you afford that?? no?? then its time build a 3d  model in Maya an do some motion tracking.
• Architectural Previsualization. ( ground or bird view)
• Set extension (Forts of Trons or Ndtv flashy news room.
• Crash from vehicle POV.
• Matte Painting ...how that end of the world like landscape has build. in Photoshop most probably.
• Replacing objects AD 230 there were no electric poles i guess! right?

original live footage of new york street where funny looking alien vehicles made in 3ds max has been inserted

The Process of match moving.

Tracking: Here specific track points on the surface of a real object will be projected in the scene to track the motion of the objects. After tracking i becomes the series of two dimensional coordinates once all the tracking data has been done...now it can be used for 2D motion or to calculate 3D motion.

Calibration: This process attempts to derive the motion of the camera by solving the inverse-projection of the 2D paths for the position of the camera. All parameters necessary to model a virtual or real world

camera, like orientation,focal length etc,and position of 3D points in a space roughly known as cloud points.

small dots( track points done in boujou)

Final Comp 3D text done in Cinema 4D.

Ground plane:Once calibration is complete, it is necessary to define a ground plane. Normally, this is a unit plane that determines the scale, orientation and origin of the projected space. Some programs attempt to do this automatically, though more often the user defines this plane. Since shifting ground planes does a simple transformation of all of the points, the actual position of the plane is really a matter of convenience.

Reconstruction: A reconstruction program can create three-dimensional objects that mimic the real objects from the photographed scene. Using data from the point cloud and the user's estimation, the program can create a virtual object and then extract a texture from the footage that can be projected onto the virtual object as a surface texture.

2D composition programme for Match Moving: Shake, Adobe Aftereffect, combustion etc.

3D composition programme for Match Moving: Maya match mover, voodoo, boujou, Nuke and Blender have Three-dimensional motion tracking capabilities.