[Bf-vfx] Plane Track (and more) small features request

[Tom M]

Easiest way for lower left corner is a special marker or the first market
(ie place the lower left marker of a planar track first).

LetterRip

On Fri, Aug 30, 2013 at 12:45 AM, Sergey Sharybin <sergey.vfx at gmail.com>wrote:

> Hi,
>
> Thanks for the feedback, answers are inlined.
>
> 1) Once I create the Plane Track there is no way to update it by changing
>> the markers/tracking them for more frames. Which means the four corners I
>> so carefully pinpointed are now lost forever.
>>
>
> Not actually truth. You might extend plane if you track markers for more
> frames. You even might re-track markers on the "existing" frames. Just
> currently you'll need to wiggle plane track corners a bit to trigger it to
> take care of changes made to point tracks (plane track is updating every
> time you edit it corners).
>
> Alternatives here would be:
>
> - Have a button to re-evaluate plane for the whole frame range
> - Do life-update of plane as you're changing point tracks (after you moved
> them, after you tracked them and so).
>
> Both ways have their conz and proz and more feedback is welcome (Seb,
> Hyper?)
>
>
>> 2) [related to #5] Option to auto-update the planar tracker while I'm
>> editing the markers (otherwise it gets really hard to track vertices after
>> they move off-screen).
>>
>
> If i get it correct, it's totally related to what i described above.
>
> Further, please do stick to blender terminology. Tracker is an algorithm
> which tracks feature point across the frames. Entity is called "plane
> track". You guys are keeping adding confusing meanings from all over the
> software which only keeps making understanding of you more complex.
>
>
>> 3) An option to start the Planar Tracker with the four vertices matching
>> the four trackers would be nice (this should be super simple, I can try to
>> tackle it myself).
>>
>
> Plane Track.
>
> For sure we thought of all obvious things in the beginning and it's in
> fact not so obvious. Rotation of the plane is really crucial and the way
> how you detect which point track corresponds to image's left bottom corner
> is really ambiguous.
>
> Here's an example. Imagine you've got a billboard on the footage which
> you're gonna to replace. It might be any of this orientations:
> http://www.pasteall.org/pic/show.php?id=58406 If you could think of
> robust way detecting left-bottom corner i'm all ears.
>
> But for now it seems in ~50% cases guessed orientation would be just
> wrong, and you'll still be frustrated and need to re-do orientation anyway.
> And a tool which behavior totally depends on number of tracks select
> combined with ambiguity makes me totally dislike suggestion above.
>
>
>> Not related to Plane Track:
>> ===========================
>> 4) Allow for multiple selection of markers in graph view (to delete/clean
>> them, when using "Detect Features"
>>
>
> You could select multiple markers within the same track. I guess you're
> taking abut being able to select multiple tracks? Then it makes sense, yes.
>
>  5) [related to #4] Allow for 'C'ircle selection in Graph mode.
>>
>
> Not sure how Circle selection would be much more usable than box selection
> in terms of motrack, bit it's not difficult to add.
>
>
>> 6) 3D Viewport snap on markers (any markers) - just like we have for
>> empties now. Note: it's to snap mesh/geometry to the markers (also it may
>> be relative simple, it can be tackled by someone else)
>>
>
> You might snap cursor to bundles positions already. But making general
> snapping aware of bundles is indeed interesting. Unfortunately, snapping
> code is one of the most pitch-black magics is the code, so i have no
> predictions about human-months to do this at this point.
>
> --
> With best regards, Sergey Sharybin
>
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