[Bf-cycles] Mirror ball crop

[Brecht Van Lommel]

Image sequences are supported now in recent builds, and will be in the
next release.

Brecht.

On Fri, Jun 22, 2012 at 1:35 PM, Мукаев Виктор <vitos1g at gmail.com> wrote:
> i think the main problem/issue is image sequence support for material
> nodes(for world material)
>
>> Date: Thu, 21 Jun 2012 15:11:46 +0200
>> From: Brecht Van Lommel <brechtvanlommel at pandora.be>
>> Subject: Re: [Bf-cycles] Mirror ball crop
>> To: bf-cycles at blender.org
>> Message-ID:
>>
>>  <CAKFUgC1uCHPsOfB6R3o+UHHw+iZifGhkk2_Ydf-KDmGuZMVk+g at mail.gmail.com>
>> Content-Type: text/plain; charset=ISO-8859-1
>>
>>
>> In principle it's of course possible to do this. There exist circle
>> detection algorithms if this needs to be automatic, but that needs
>> quite a bit of coding time. Or it could perhaps be done more manually
>> by keyframing a mask in the tracker, but then I guess still missing is
>> some automatic way to crop the image to the bounds of the mask, which
>> is not particularly hard to implement.
>>
>> Brecht.
>>
>> On Thu, Jun 21, 2012 at 12:45 PM, Tony Mullen <tony.mullen at gmail.com>
>> wrote:
>> > Hi Dalai,
>> >
>> > Thanks for the feedback.
>> >
>> >> Have you considered capturing it with a fisheye instead or a
>> >> mirrorball?
>> >
>> > Well, the first bottleneck is budget. I have a DP with a Red Epic, but
>> > he doesn't have a fisheye lens for it. I can look into buying him one,
>> > but it might be a bit costly for me.
>> >
>> > The second thing is that what I had in mind was to shoot ordinary,
>> > undistorted movie footage using the mirror ball to stand in for the CG
>> > object, and then crop that mirror ball out and use it as a
>> > light/reflection source, then composite the CG object back into the
>> > original movie footage. This way, all the live action stuff would be
>> > shot once, and the reflections would be automatically captured on the
>> > surface of the mirror ball.
>> >
>> > Basically something along the lines of this:
>> >
>> > http://www.hdrv.org/IBL.php
>> >
>> >> 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?
>> >
>> > I imagine it shouldn't be hard to export the HDR video to a sequence
>> > of .hdr still images (I'm not 100 percent how to do this in Redcine,
>> > but I guess it can be done). The tricky part is cropping it to fit the
>> > Cycles mirror-ball mapping requirements. I guess there are probably
>> > tools somewhere that can be used for batch cropping HDR video frames,
>> > but I'm not sure how to do that. If it could be done in Blender it
>> > would be pretty handy, I think.
>> >
>> > Keyframing the crop was just an idea I had to make the setup more
>> > flexible. I think it could be pretty powerful. Basically a silver ball
>> > anywhere in a live action scene could be cropped out and used as an
>> > accurate light source, even if it moved around within the shot.
>> >
>> > T
>> >
>> >
>> >
>> >
>> >>> 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
>> >>>
>> >> -------------- next part --------------
>> >> An HTML attachment was scrubbed...
>> >> URL:
>> >> http://lists.blender.org/pipermail/bf-cycles/attachments/20120620/cdf8e8df/attachment-0001.htm
>> >>
>> >> ------------------------------
>> >>
>> >> _______________________________________________
>> >> Bf-cycles mailing list
>> >> Bf-cycles at blender.org
>> >> http://lists.blender.org/mailman/listinfo/bf-cycles
>> >>
>> >>
>> >> End of Bf-cycles Digest, Vol 14, Issue 18
>> >> *****************************************
>> > _______________________________________________
>> > Bf-cycles mailing list
>> > Bf-cycles at blender.org
>> > http://lists.blender.org/mailman/listinfo/bf-cycles
>>
>>
>> ------------------------------
>>
>> _______________________________________________
>> Bf-cycles mailing list
>> Bf-cycles at blender.org
>> http://lists.blender.org/mailman/listinfo/bf-cycles
>>
>>
>> End of Bf-cycles Digest, Vol 14, Issue 19
>> *****************************************
>
>
>
>
> _______________________________________________
> Bf-cycles mailing list
> Bf-cycles at blender.org
> http://lists.blender.org/mailman/listinfo/bf-cycles
>