i think the main problem/issue is image sequence support for material nodes(for world material)<br><br><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Date: Thu, 21 Jun 2012 15:11:46 +0200<br>
From: Brecht Van Lommel <<a href="mailto:brechtvanlommel@pandora.be">brechtvanlommel@pandora.be</a>><br>
Subject: Re: [Bf-cycles] Mirror ball crop<br>
To: <a href="mailto:bf-cycles@blender.org">bf-cycles@blender.org</a><br>
Message-ID:<br>
<<a href="mailto:CAKFUgC1uCHPsOfB6R3o%2BUHHw%2BiZifGhkk2_Ydf-KDmGuZMVk%2Bg@mail.gmail.com">CAKFUgC1uCHPsOfB6R3o+UHHw+iZifGhkk2_Ydf-KDmGuZMVk+g@mail.gmail.com</a>><br>
Content-Type: text/plain; charset=ISO-8859-1<br>
<br>
In principle it's of course possible to do this. There exist circle<br>
detection algorithms if this needs to be automatic, but that needs<br>
quite a bit of coding time. Or it could perhaps be done more manually<br>
by keyframing a mask in the tracker, but then I guess still missing is<br>
some automatic way to crop the image to the bounds of the mask, which<br>
is not particularly hard to implement.<br>
<br>
Brecht.<br>
<br>
On Thu, Jun 21, 2012 at 12:45 PM, Tony Mullen <<a href="mailto:tony.mullen@gmail.com">tony.mullen@gmail.com</a>> wrote:<br>
> Hi Dalai,<br>
><br>
> Thanks for the feedback.<br>
><br>
>> Have you considered capturing it with a fisheye instead or a mirrorball?<br>
><br>
> Well, the first bottleneck is budget. I have a DP with a Red Epic, but<br>
> he doesn't have a fisheye lens for it. I can look into buying him one,<br>
> but it might be a bit costly for me.<br>
><br>
> The second thing is that what I had in mind was to shoot ordinary,<br>
> undistorted movie footage using the mirror ball to stand in for the CG<br>
> object, and then crop that mirror ball out and use it as a<br>
> light/reflection source, then composite the CG object back into the<br>
> original movie footage. This way, all the live action stuff would be<br>
> shot once, and the reflections would be automatically captured on the<br>
> surface of the mirror ball.<br>
><br>
> Basically something along the lines of this:<br>
><br>
> <a href="http://www.hdrv.org/IBL.php" target="_blank">http://www.hdrv.org/IBL.php</a><br>
><br>
>> Either way I think you will have a better luck by pre-processing the input<br>
>> into any of the standard inputs that blender can take. Or the processing<br>
>> time is your bottleneck?<br>
><br>
> I imagine it shouldn't be hard to export the HDR video to a sequence<br>
> of .hdr still images (I'm not 100 percent how to do this in Redcine,<br>
> but I guess it can be done). The tricky part is cropping it to fit the<br>
> Cycles mirror-ball mapping requirements. I guess there are probably<br>
> tools somewhere that can be used for batch cropping HDR video frames,<br>
> but I'm not sure how to do that. If it could be done in Blender it<br>
> would be pretty handy, I think.<br>
><br>
> Keyframing the crop was just an idea I had to make the setup more<br>
> flexible. I think it could be pretty powerful. Basically a silver ball<br>
> anywhere in a live action scene could be cropped out and used as an<br>
> accurate light source, even if it moved around within the shot.<br>
><br>
> T<br>
><br>
><br>
><br>
><br>
>>> Hi all,<br>
>>><br>
>>> I'd love to use HDR video from a Red Epic as a light/reflection<br>
>>> source. It seems like the best way to do this would be to use an HDR<br>
>>> video of a mirror ball, and use the mirror ball mapping. It seems like<br>
>>> it would be quite helpful to be able to crop the image from within<br>
>>> Blender. For example, to place and scale a circle in the UV Image<br>
>>> editor to tell Cycles what part of the video frame to use as the<br>
>>> mirror ball.<br>
>>><br>
>>> Even cooler would be to be able to keyframe the size and placement of<br>
>>> the cropping circle, so that you could "rotoscope" the position of the<br>
>>> mirror ball within the frame, enabling the camera to move more more<br>
>>> freely (the light source would then be mapped to follow the camera's<br>
>>> movement within the 3D space).<br>
>>><br>
>>> Does this sound like something that can be done, or is anybody<br>
>>> planning to implement something similar?<br>
>>><br>
>>> Regards,<br>
>>><br>
>>> Tony<br>
>>> _______________________________________________<br>
>>> Bf-cycles mailing list<br>
>>> <a href="mailto:Bf-cycles@blender.org">Bf-cycles@blender.org</a><br>
>>> <a href="http://lists.blender.org/mailman/listinfo/bf-cycles" target="_blank">http://lists.blender.org/mailman/listinfo/bf-cycles</a><br>
>>><br>
>> -------------- next part --------------<br>
>> An HTML attachment was scrubbed...<br>
>> URL: <a href="http://lists.blender.org/pipermail/bf-cycles/attachments/20120620/cdf8e8df/attachment-0001.htm" target="_blank">http://lists.blender.org/pipermail/bf-cycles/attachments/20120620/cdf8e8df/attachment-0001.htm</a><br>
>><br>
>> ------------------------------<br>
>><br>
>> _______________________________________________<br>
>> Bf-cycles mailing list<br>
>> <a href="mailto:Bf-cycles@blender.org">Bf-cycles@blender.org</a><br>
>> <a href="http://lists.blender.org/mailman/listinfo/bf-cycles" target="_blank">http://lists.blender.org/mailman/listinfo/bf-cycles</a><br>
>><br>
>><br>
>> End of Bf-cycles Digest, Vol 14, Issue 18<br>
>> *****************************************<br>
> _______________________________________________<br>
> Bf-cycles mailing list<br>
> <a href="mailto:Bf-cycles@blender.org">Bf-cycles@blender.org</a><br>
> <a href="http://lists.blender.org/mailman/listinfo/bf-cycles" target="_blank">http://lists.blender.org/mailman/listinfo/bf-cycles</a><br>
<br>
<br>
------------------------------<br>
<br>
_______________________________________________<br>
Bf-cycles mailing list<br>
<a href="mailto:Bf-cycles@blender.org">Bf-cycles@blender.org</a><br>
<a href="http://lists.blender.org/mailman/listinfo/bf-cycles" target="_blank">http://lists.blender.org/mailman/listinfo/bf-cycles</a><br>
<br>
<br>
End of Bf-cycles Digest, Vol 14, Issue 19<br>
*****************************************<br>
</blockquote><br></div><br>