[Ticket #4482] Point on plane with respect to another point

[Pauvres_honteux]

Trying to create a point(yellow) on a plane with a position relative to another point(blue). I do succeed in placing the point(DatumPoint_5_on_DatumPlane_1) on the plane but can not at the same time get it positioned relative to another point(DatumPoint_1).
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In the picture three datum planes are defined by four points.
The three pink points are connected to the blue point.
Regarding GUI, see

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Point_on_plane_with_position_relative_to_a_point_1.png (38.16 KiB) Viewed 1378 times

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Point_on_plane_with_position_relative_to_a_point_2.png (79.18 KiB) Viewed 1378 times

[Bance]

Your file would be helpful.

[saso]

This should be basically related to my request here https://forum.freecadweb.org/viewtopic. ... in#p357868 that is that the current attachment mode should have separate definitions for the placement (support), origin and orientation. In your example the support of the yellow point would be the plane and its origin would be the blue point.

Also related to this was this discussion about datum planes and its relations to placement of sketches https://forum.freecadweb.org/viewtopic.php?f=3&t=45159 but one has to understand that the implementation of the object attachment (map mode) is sort of generic for all the objects in FreeCAD, so this discussion/issue is actually related to all the different objects that support it.

[Pauvres_honteux]

Your file would be helpful.

Of course, your wish is my law!
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Ball_corner_PartDesign.FCStd

(8.27 KiB) Downloaded 28 times

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Ball_corner_Part.FCStd

(21.57 KiB) Downloaded 24 times

[Pauvres_honteux]

Anyone who can fix this?
If not I'll create a feature request.

[Bance]

Is this what you want?

[Pauvres_honteux]

Is this what you want?

Sorry to say, but no.
The problem is to create a point on a plane with respect to another point while keeping everything connected.
Super powerful I might add!

[saso]

well, I still believe the above suggested improvement to the attachment mechanism would be the right solution, but one way to work around it (at least for some situations) is with a sketch...

so in this example it is the Sketch that is mapped to DatumPlane_1 and DatumPoint_1 and then the DatumPoint_5 is mapped to one of the vertices of the Sketch.

update: I have added another example that uses a secondary plane instead of the sketch, but the basic principle is the same, one could also use an LCS in the same way... but if the main points get moved around things can get a bit out of control, if using the LCS one can actually best understand what is going on, orientation changes, I don't know how to make this more stable, above suggested improvement could possible do it.

Ball_corner_PartDesign_bySketch.png (162.78 KiB) Viewed 1133 times

[Bance]

If I set dimensions to your sketch and equivalent attachment offsets in my model, the placement of the point is identical.

So what is actually being sought?

[saso]

If I set dimensions to your sketch and equivalent attachment offsets in my model, the placement of the point is identical.

So what is actually being sought?

I have tested your solution only now, true they both seem to give the same result, as long as you don't start to move the main points around