Motion tracking in After Effects.

Notes of GD Lecture 1 12 15

Coffee cup created in 4D in a real life video.

 

Method

  1. After effects
  2. Import video
  3. Drag into timeline
  4. Has to remain consistent in the scene
  5. Must have reference
  6. Composition layer
  7. >Advanced analysis performed because the video is of a low quality (IOS). High end
  8. camera footage does not need detailed analysis.
  9. This creates green/ red points  (butterflies) termed ‘automated tracking points’
  10. Green tracking markers are most accurate with red ones most deviated
  11. Hover mouse to get the red target.
  12. Find most close matched to the orientation of the desired object.
  13. Finds most accurate
  14. Create solid and camera(coloured  area)
  15. 2 more object
  16. 3d camera
  17. trim to size
  18. Creates orange square (napkin!) becomes base ( but not the floor)
  19. Separate plug in for exporting
  20. Then export
  21. Open 4d
  22. has orange blob ready
  23. >Import cup
  24. Turn of square
  25. video or still images
  26. >Render (clapper board cog)
  27. Alpha channel (black background)
  28. Black becomes transparent tiff/png
  29. >New folder
  30. Creates 250 still images (10 secs)
  31. Lighting will take longer to render.
  32. Back to Ae import as

 

Seminar Reference video is here 

Visual Method

Screen Shot 2016-05-03 at 10.33.42

Load video track camera

Screen Shot 2016-05-03 at 10.34.00

Analyzing

Screen Shot 2016-05-03 at 10.34.42

The markers (butterflies) are graded according to reliability. Run the video to check that the marker stays green throughout the footage.

Screen Shot 2016-05-03 at 10.37.09

This target is in the wrong position.

Screen Shot 2016-05-03 at 10.37.19

Good position

 

Screen Shot 2016-05-03 at 10.44.28

Yellowed targets indicate selection

Screen Shot 2016-05-03 at 10.48.34

Introduce the track solid ( blue square)

Screen Shot 2016-05-03 at 10.49.28

Showing track solid

Screen Shot 2016-05-03 at 10.51.07

Without target

Screen Shot 2016-05-03 at 10.58.04

Click on track solid to fine tune

Screen Shot 2016-05-03 at 11.00.57

Run the video to check for good alignment

Screen Shot 2016-05-03 at 11.40.08

Export as Cinema 4D file. This will require an add on for CS6. Import into  C4D then copy the object into the file. Manoeuvre the cup in this case onto the solid. Do not move the camera.

Screen Shot 2016-05-03 at 11.41.39

Landing the cup is rather like “lunar lander” games from the eighties

Screen Shot 2016-05-03 at 11.45.11

The Eagle (cup) has landed and had to be rotated in to place.

Screen Shot 2016-05-03 at 11.47.29

Render settings: Choose a file destination and file name. The Alpha channel must be checked to ensure that a black impenetrable square is not produced.

Screen Shot 2016-05-03 at 11.47.41

Render to picture

Screen Shot 2016-05-03 at 11.49.20

During rendering. Note the tiff images being created in the destination file.

Screen Shot 2016-05-03 at 11.51.20

Input the tif files as a sequence (ensure box is ticked)

Screen Shot 2016-05-03 at 11.52.10

Screen Shot 2016-05-03 at 11.55.47

Alpha channel now checked!

Screen Shot 2016-05-03 at 11.58.11

If the tifs are not imported as a sequence this dialog box will present itself for every image. Their is no escape. Click OK (frequently)

Screen Shot 2016-05-03 at 11.58.27

All software should be equipped with this key.

Screen Shot 2016-05-03 at 12.16.12

Finally the cup in situ.

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