For this short film, I was tasked with supervising a series of complex VFX shots, each requiring careful planning, problem-solving, and meticulous data collection. My role began before the cameras rolled, ensuring the groundwork was laid for a smooth post-production process.
Lens Distortion Mapping
The first step was mapping the distortion of each lens used on set. Working with the camera department, I aligned the camera sensor with a distortion grid displayed on a large TV. We captured footage of the grid at various distances and with each lens. These recordings enabled me to undistort the lens characteristics during post-production, ensuring more accurate 3D tracking and seamless compositing of elements into the final shots.
Color Matching with Macbeth Charts
For shots requiring CG elements or when time allowed, I captured footage of a Macbeth color chart placed at the center of the scene. This provided a reliable reference for matching colors during compositing. By rendering a virtual version of the color chart within the 3D scene, I could ensure precise color consistency between real and digital elements.
360 HDRi Data
To recreate realistic lighting and reflections, I used a 360-degree camera to capture exposure-bracketed images for HDRi creation. These HDRi maps provided detailed lighting information for CG renders.
Photogrammetry and Reference Materials
Whenever possible, I performed photogrammetry scans of actors and key props, capturing detailed reference imagery to aid in creating accurate digital doubles or CG replacements. These scans were instrumental in achieving high-quality composites. Additionally, I used a LiDAR scanner to create accurate 3D scans of rooms and tracking markers, further enhancing the fidelity of reflections and lighting in the composited shots while improving tracking data.
Witness Camera Integration
In one particularly challenging scenario, traditional 3D tracking was difficult due to minimal movement and visual markers. To overcome this, I attached a 360-degree camera to the principal camera as a witness cam. By measuring the offset between the 360 camera and the principal camera’s sensor, I ensured accurate 3D tracking and integration of CG elements.
Creative On-Set Problem Solving
Some bespoke effects required creative solutions on set. By staying flexible and collaborating closely with other departments, I addressed unique challenges efficiently, ensuring the production remained on schedule.
This project demonstrated the critical role of on-set VFX supervision in bridging production and post-production. By proactively collecting data, solving technical challenges, and ensuring precision, I laid the foundation for a smooth and successful VFX pipeline. The result was a visually cohesive and polished final product that met the film’s ambitious creative vision.
