Just like the reference drawings, the backgrounds of the teaser were all hand-drawn using graphite on tracing paper.
For every shot, we had a layout predicting the different layers needed for each background, as well as the characters for animation, each color indicating a different layer. For every distinct layer, a different drawing was produced, reflecting the vision of the director for the shot. They were then scanned separately and treated digitally.
The backgrounds are imported to Blender where, using 3D motion tracking, a digital camera recreates the original camera movement of the filmed shot. The separation of the background elements defined in the layout considers the depth, perspective and parallax captured by the filming camera, in order to recreate the real location in a digital spacial construction.
For this to happen, the live-action footage of the shot is imported to Blender, where strategic tracking points are set in several key elements of the footage. This trackers will allow Blender to perceive the camera movement of the footage, mimicking it on a digital camera. In this process, Blender recreates not only the position of the camera throught the shot, but also it's focal length.
Once the camera is set, 3D models are built to recreate the shapes and volumes of the real life set. It's important that they match the composition of the frame that was previously chosen on the layout - reflecting also the composition of the background drawings.
This drawings are then projected in the 3D models, recreating digitally the real place where the film was shot.
From there, the character animation is added and we proceed with the needed adjustments.
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