Ah if you're using the PlanarTracker, there's actually a "set reference frame" button in the toolbar that allows you to change the reference frame to a new frame.
However, if you're using data that someone else has already exported you might have to go down the "invert & multiply your own matrices" route. On Tue, Oct 20, 2015 at 11:23 AM, Pete O'Connell <pedrooconn...@gmail.com> wrote: > Hi Dan and Ben here is the scenario with a bit more detail. Using nuke's > planar tracker, track a face, for example. The gathered data is stored as > an animated transform matrix. Using this matrix, I want to set a reference > frame (identity matrix on a certain frame), but I want to be free to choose > any frame and update the reference frame to that frame (like I can using a > tracker node or a corner pin (setting the froms to the tos on a certain > frame)). I will try multiplying by the inverse of the matrix (yowza) > That sounds promising! > > Thanks guys! > Pete > > On Tue, Oct 20, 2015 at 9:52 PM, Dan Ring <r...@thefoundry.co.uk> wrote: > >> Hi Pete, >> >> can you explain your problem a bit more, for example what nodes are you >> using, were you simply given a Transform / CornerPin node that has an >> animated matrix? There may be an easier way to achieve what you want. >> >> The following is the "hard way". First go to your new reference frame 'f' >> and get that matrix, let's call it M. Now for every frame, get the matrix >> A, and post-multiply it by the inverse of M, and set that as your new A, >> e.g. A = A * M^-1. This is effectively warping everything by the opposite >> of whatever existed at 'f', making 'f' your new reference frame. For >> practical reasons, it might make more sense to save your matrix into a new >> Transform node so that you still have the original if you want. >> >> Hope that makes sense, >> >> Dan. >> >> >> >> >> >> >> On Tue, Oct 20, 2015 at 3:53 AM, Pete O'Connell <pedrooconn...@gmail.com> >> wrote: >> >>> Hi, does anyone have any insight into how to set the reference frame on >>> an animated transform matrix? This would be similar to setting the >>> reference frame on a tracker node or making the FROMs the same as the TOs >>> on a certain frame of an animated cornerpin node. >>> >>> I'm stumped :P >>> >>> Pete >>> >>> _______________________________________________ >>> Nuke-python mailing list >>> Nuke-python@support.thefoundry.co.uk, http://forums.thefoundry.co.uk/ >>> http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-python >>> >>> >> >> >> -- >> Dan Ring, Ph.D. >> Senior Research Engineer >> The Foundry >> 31-36 Ormond Quay Upper >> Dublin 7 >> Ireland >> Tel: +353(0) 1 526-6788 >> Web: www.thefoundry.co.uk >> Email: dan.r...@thefoundry.co.uk >> >> The Foundry Visionmongers Ltd. >> Registered in England and Wales No: 4642027 >> >> _______________________________________________ >> Nuke-python mailing list >> Nuke-python@support.thefoundry.co.uk, http://forums.thefoundry.co.uk/ >> http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-python >> >> > > > -- > - > > _______________________________________________ > Nuke-python mailing list > Nuke-python@support.thefoundry.co.uk, http://forums.thefoundry.co.uk/ > http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-python > > -- Dan Ring, Ph.D. Senior Research Engineer The Foundry 31-36 Ormond Quay Upper Dublin 7 Ireland Tel: +353(0) 1 526-6788 Web: www.thefoundry.co.uk Email: dan.r...@thefoundry.co.uk The Foundry Visionmongers Ltd. Registered in England and Wales No: 4642027
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