[Bf-cycles] Mirror ball crop

Dalai Felinto dfelinto at gmail.com
Wed Jun 20 20:43:46 CEST 2012

Hi Tony,
Have you considered capturing it with a fisheye instead or a mirrorball?

I saw samples of Red Scarlet + Sigma 4.5mm lens and it's pretty impressive:
http://paulbourke.net/miscellaneous/domefisheye/cameras/ (see last pictures
of this page).

In 4K it crop the bottom and top, but in 5K you get a full dome image
(180x180) (from that to a full panorama (360x180) you would need multiple
shots, though it may be overkill).
Either way I think you will have a better luck by pre-processing the input
into any of the standard inputs that blender can take. Or the processing
time is your bottleneck?

My 2 cents,

2012/6/20 Tony Mullen <tony.mullen at gmail.com>

> 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
> _______________________________________________
> Bf-cycles mailing list
> Bf-cycles at blender.org
> http://lists.blender.org/mailman/listinfo/bf-cycles
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