Wednesday, October 27, 2010

Recognizing and Correcting Common 3D Problems

As part of Wednesday’s 3D program, 3Ality’s Howard Postley discussed how to identify and correct common problems with the format.
“Nausea and headaches are not inherit in 3D, but in bad 3D,” he suggested, adding that “as Jeffrey Katzenberg has said, ‘making your audience hurl is not a good business model.' ”
During his talk, Postley explained some of the basics:
--In 3D, one is talking about perceived dimensions, which are subjective. Physical dimensions are objective. They are meansureable and real.
--The physical dimensions are depth cues. These include binocular cues, focus-based cues, knowledge-based cues, motion-based cues, occlusion-based cues, and perspective-based cues.
--A key to technically-good 3D is to start with correct geometry, as physical misalignments distort geometry. Additionally, all dimensions must be consistent.
--Postley presented a series of clips that showed common problems, as well as solutions. That included iris and focus mismatch, and issues such as divergence or edge violations. Edge violations, he suggested, can be addressed for instance by reframing the shot or changing the depth of the person or object in question.
He suggested that 3D creativity will be built on technically correct 3D production. 

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