BALL SCIENCE

Accuracy is everything in the world of visual effects.

VFX BALLS are vital tools for recording precise lighting information.

These reference balls allow VFX teams to recreate authentic lighting in post-production so computer generated elements merge naturally with live-action shots. By reflecting their surroundings, they provide essential details about light direction, brightness, and color, helping artists deliver realistic results.

“Every great VFX shot starts the same way: with a DP rolling their eyes while we pull out the balls.”

HOW TO?

Coordinate with the crew ahead of time to ensure the cinema camera will be used to capture reference material. If you’re using your own DSLR for HDR stills, always shoot in RAW HDR format, set the same Kelvin temperature, and film the same chart using identical settings as when shooting the balls. Keep detailed records of everything.

Every shot containing CG components must include a BALL reference.

Once a VFX shot is filmed and the director approves the take, photograph the BALL reference immediately afterward.

Whenever the camera angle or ambient lighting changes, capture a new BALL reference.

Ideally, the main production camera should film the reference ball from the same perspective as the scene to provide the most accurate lighting and shading information.

If this isn’t possible, use a DSLR-HDR camera to photograph the ball and include a color checker card. Make sure the main camera also films the color checker card so that both cameras color spaces and white balance can be matched accurately.

For moving CG elements, it’s recommended to record a pass of the BALLS being physically moved through the set to capture dynamic lighting changes.