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Lighting and 3D

March 18, 2011
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Lighting is very important in 3D, with correct lighting the depth of field can be enhanced.

This Thursday, I got some more practical 3D experience where I converged and lined up the 3D beamsplitter rig, this was a very fiddly exercise.
To line up the camera one needs to adjust the screws on the side of the camera plate, small changes to these screws make a big difference. One needs a lot of patience for this but it is very rewarding when the camera is finally lined up.

To converge the camera’s on your 3D subject, this is done by
1. increasing the size of the interaxial (by 25mm or 50mm) this is measured using a ruler, between the edge of the plate and the camera
2. picking a point on the subject, maybe their eyes, then swiveling the plate of the horizontal (right) camera, so that the pictures are lined up on their eyes. This means every thing behind the subjects eyes will be behind the screen and everything in front of the subject eyes will be coming out of the screen.

A 3D beamsplitter shoot is much easier now Ravensbourne has a 3D tv (jvc).

This is the 3D setup:
Both cameras have to be timed and sync’d this done by connecting genlock from the cameras to the HDTV sync generator box.
The output of the cameras go into a 3D HDMI box which converts SDI signals to HDMI. The box has labeled left and right camera inputs, and also does the flopping of the left eye. The output of this box is fed directly in to the 3D tv via the HDMI input and can be viewed in 3D as a side by side picture.

Last week we did a camera shoot on the Thames clipper going into London using Craig’s side by side rig that is mounted on a wooden plank. For a few shots the cameras where taken off the plank and manually held and converged on a building by making the building the centre of the shot and lining the horizon up is key. But the problem with boats they are very bumpy and the camera will move at different times. It turns out that a lot of the footage was unusable, because the camera was not clapped in, the camera horizon was not horizontal and also the distances/landscape shots loose the depth of field becoming 2D.

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