[Bf-cycles] Mirror ball crop

[Tony Mullen]

Hi all,

I'd love to use HDR video from a Red Epic as a light/reflection
source. It seems like the best way to do this would be to use an HDR
video of a mirror ball, and use the mirror ball mapping. It seems like
it would be quite helpful to be able to crop the image from within
Blender. For example, to place and scale a circle in the UV Image
editor to tell Cycles what part of the video frame to use as the
mirror ball.

Even cooler would be to be able to keyframe the size and placement of
the cropping circle, so that you could "rotoscope" the position of the
mirror ball within the frame, enabling the camera to move more more
freely (the light source would then be mapped to follow the camera's
movement within the 3D space).

Does this sound like something that can be done, or is anybody
planning to implement something similar?

Regards,

Tony