(How) are queued not reentrant VIs?

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  Add behaviors to link to the X and the parameters Y of your object under control. (You need add separate links to individual settings, because there is a mismatch of types of settings.)

  In Wells of the behaviour Source object, add the group to the OSC. For the Source parameter in the compatible settings drop-down list, select Filters.Poke.Center.X and Y respectively.  Your object will move to the upper right corner of the canvas. At the bottom of each link behavior Inspector, there is an Offset value. Define each of these to-0.5 (which resets the object in the middle of the canvas.)

  Your object will now be controllable in FCPX with the control on the screen.

  You know how application relates to several destinations resolution and how it applies to what you were doing just a little.

  Motion (very skillfully I must add) treated all resolutions screens as having the coordinates of 0 and 1 (inclusive). No matter what draft resolution you have, SD, HD, 4 K, etc... Controls of the OSC are considered as having the same dimensions. Real pixel values are calculated from the screen resolutions for horizontal and vertical to the destination video (project) dimensions. [Fixed resolution dimensions help you determine the proportions in FCPX, but according to me, are automatically set to adapt to the target FCPX project when it is applied.] Maybe it's not always true, and if you make adjustments, then you essentially override this behavior in your specific model project. See below.]

  In the middle of the canvas to an object, as a form, etc., is (0,0), but for a CSO is 0.5, 0.5. When you create a relationship between an object and the parameters on-screen control center, you're "setting" the Center in a different coordinate system. Compensation for these values to the negative terminal of the Center value resets the position to the original 'normal '.

  Whatever he says, you can actually fool onscreen controls by setting a custom 'resolution' of the group you places in the dimensions of fixed resolution (say: 300x500pixels). So if you want to create something like a "HUD" to appear in FCPX and have the only control flow within its limits and control another object on the screen, which can be done (using the behaviors of clamp to restrict the Center.X and the Center.Y to between 0 and 1 and the OSC will remain within the limits of the resolution group fixed dimensions you set).  If you don't 'get' this still, forget about it then for now, it is not so important and has nothing to do with what you were asking. [In the case of a "HUD" type configuration, you can create another group with other CSO to control the placement of objects on the screen HUD Group, and everything in this group would be sent as CSOS, including the CSOS of the object of HUD designed... get some practice with CSO, then venture into complicated. You are only limited by what you can put together with what you have available in motion if you do not program such things at the level of the application/plugin. [Here is an example of this type of control project - it's very simple and used to define the background color: https://www.youtube.com/watch?v=jpIxuuZuko8 - it has been designed to be taken apart and studied.]

  If you build a model with CSO and the OSC does not appear in FCPX: return in movement and check that his group has length (Timing) and make sure that you have checked the box publish CSOS (and that the effect is selected in the Inspector of FCPX - click the title bar of effect).

  On the resolution fixed. Motion, by default, the account of dynamic groups - they grow and to shrink to just be the bounding box of all that they contain. By setting the fixed resolution, you force Motion to limit the group size to what you have defined. When control of the center of CSOS goes beyond the limits of a dynamic group, it acts as a multiplier of positional - and your purpose (most of the time immediately) disappears very quickly off the screen. If your initial group of the OSC has no physical object in it, it's dynamic ratings are 0 x 0 and * any * movement of the control on the screen increases by whole numbers for each pixel, it moves. If you move the OSC 1/2 pixel in any direction, the object's Center is already aligned with the edge of the canvas.

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