Using Track Points behavior to move both ends of a line?

Ok,

Here is a screenshot :

As you can see, it works for one dot.

But soon as I activate the second track point behavior, an awful offset appears :

I know there is an offset on the anchor-point in the tutorial and a rate on a rotation but I was looking for to not add theses parts of the tip because draw circles are more efficients.

Is it possible ?

How did you do to adjust your dots on the circles ?

no clue how I did two years ago 😁

so, from zero:

here's my new project:

two dot.pngs, two circles (which have only illustrational use in my set)

you notice: the dot.pngs anchor is not in the center of the png but off-set to the circles

=> when you now 'Rate' the z-axis of the png, it rotates 'along' the circle - it doesn't, just (intentional) similarity 😉

next: drawing a line btw. both dots.

Apply 'Track Point' Behaviour twice, check/uncheck which point of the line should follow which dot (be disciplined with naming elements 😉 ) - aaand:

da Maschine worx … LOL

again: the circles are just illustration, no motion-paths or wotever, the animation would work without it!

Combo wrote:

Ok,

How did you do ?

I discloser here my best kept secrets! 😉

Trouble with that kind of animation (which is not done in Motion, if I remember correctly) you would have to have the need to access these two parameters of a Shape:

… and Apple in its limitless wisdom prohibits just that.

So, Plan B

Using an Image? And apply the Four Corners to the dummy.dots, to 'stretch' the image? Nope, doesn't work either (somehow Linking the Four Corners to the dummy dots position doesn't work, at last for me)

So, what we need is a line with a flexible start- and end-point - which is in M5 only manageable with an - drumroll! - Emitter:

Set some crazy parameters…

… for instance 10.000 Birth Rate, to make 'many dots' a 'solid' line … which doesn't come out very well … for me.

No, best to my knowledge, your only real option is to keyframe the line manually 😟

Combo wrote:

…

I can't use a draw circle but an image... 😝

yep, indeed, no shapes, HAS to be an image, any image.

the white-dot.png comes handy, cause of size (on screen and of file size)

… wow, I posted that in 2015?? gosh … 😎

Yep,

I understood that with this tutorial :

https://www.youtube.com/watch?v=Kaj969r7t9I

I'd like to extend it with a motion path on a draw circle to control the radius of the rotation like it seems you did but as soon as I use this behavior, the line doesn't follow the dots anymore...

Any idea ?

Thx.

Combo wrote:

…

I understood that with this tutorial :

https://www.youtube.com/watch?v=Kaj969r7t9I

I'd like to extend it with a motion path on a draw circle to control the radius of the rotation …

that was my source of knowledge either! If I remember correctly (two years ago!) the two dots where simply rotating around an off-set anchor-point … no paths involved 😉

can you apply a screen-shot/scribble of your 'construction'? I'm a bit lost in translation …

in my example, I would simply rig the anchor-points position to vary the circles diameter …

Plus, you've followed Mark's advice to track the points on first use?

Ok,

How did you do ?

In fact, my aim is to reproduce these part of the video at https://youtu.be/qK4Re_ArS3Q?t=42 when the points turn and are assembled. But I'm new in Motion... But used to be a Flash dev senior...

Thx.

Hi,

I have the same problem...

I understood what to do but for me, the behavior looks not the same than your screenshot Karsten :

I can't choose the beginning and the end of my line...

Karsten Schlüter wrote:

…does NOT work, when the ref-dot follows a path …

uhm, well, with some secret Motion-Fu, it does 😝

but the green 'line' is no line… in full-res it doesn't look good.

Robert Kleindienst1 wrote:

I have two objects moving in a video and want to attach a line shape between them....

Have a look:

two circles, a 'dot' applied to each, the dots are moved by a behavior to rotate....

The line connecting them. is a bezier

no Motion Tracking needed

Just dragging the dot into the TrackPoint's dwell

And:

Select which points are tracked - see the red arrows:

or, in less words_

each end of the line has to have its own Track Point Behavior ..

I found why...

I can't use a draw circle but an image... 😝

And also,

How did you do to adjust your dots on the circles ?

oh, forgot to mention:

listen to what Mark says at 5:50 of the tut:

"works only on Scale and Rotation"

=> does NOT work, when the ref-dot follows a path … 😟

Ok...

I thought you used the circles as a path for the animation which could be great to modify it quickly...