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rotate a vector and points

otaolafr
otaolafr Member Posts: 113 EDU
in FeatureScript
hello,
how can I rotate vectors and points around a line with a given angle in FS? (to move them by the angle given)
as opTransform only accepts bodies....

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Answers

  • ilya_baran
    ilya_baran Onshape Employees, Developers, HDM Posts: 1,273 image
    opTransform is for rotating geometry in the context.  For transforming vectors (and other things like lines and planes) you can just multiply the transform by the point:
    var myTransform = rotationAround(myLine, 30 * degree);
    var newPoint = myTransform * (vector(1, 2, 3) * meter);
    Ilya Baran \ VP, Architecture and FeatureScript \ Onshape Inc
  • otaolafr
    otaolafr Member Posts: 113 EDU
    edited August 2019
    ilya_baran said:
    opTransform is for rotating geometry in the context.  For transforming vectors (and other things like lines and planes) you can just multiply the transform by the point:
    var myTransform = rotationAround(myLine, 30 * degree);
    var newPoint = myTransform * (vector(1, 2, 3) * meter);
    i cant succed to make it work....
    trying this :(point1 and 2 are previously defined)
    var Line1=line(point1,point2);
    var transf=rotationAround(X_AXIS,definition.xangle);
    var linerotated= transf*Line1;

    it needed a unit. thanks!
  • ilya_baran
    ilya_baran Onshape Employees, Developers, HDM Posts: 1,273 image
    Without the specific error (including line number) and the whole feature, it's impossible to debug.  Please post a link to a public document.
    Ilya Baran \ VP, Architecture and FeatureScript \ Onshape Inc
  • otaolafr
    otaolafr Member Posts: 113 EDU
    ilya_baran said:
    Without the specific error (including line number) and the whole feature, it's impossible to debug.  Please post a link to a public document.
    it is okey, actually when i tried same thing that you told me with vectors, it didnt work, but after i gave them units it worked. so, i solved to translate the points and after do the line.

    thanks anyway
  • yudhi_ariadi
    yudhi_ariadi Member Posts: 1 ✭
    Yes, we can do with a line, but I hope I dont have to create a line only for rotating the entity. 
    using point and vector would be fantastic.
    Thank you.
  • NeilCooke
    NeilCooke Moderator, Onshape Employees Posts: 6,092 image
    yudhi_ariadi said:
    Yes, we can do with a line, but I hope I dont have to create a line only for rotating the entity. 
    using point and vector would be fantastic.
    Thank you.
    You don’t have to create a physical line - the Line object is a point (with units) and a vector (unitless)
    Senior Director, Technical Services, EMEA
  • jelte_steur_info
    jelte_steur_info Member Posts: 675 PRO
    edited May 2024
    for the newbs (like me) ending up on this thread searching how to rotate a direction vector.
    I tried

    coneAngleRotation = rotationAround(rotationAxis, angle);
    normalize(toPlaneNormal = coneAngleRotation * (toPlaneNormal * meter)

     in order to rotate the unitless direction vector "toPlaneNormal". This doesn't work because in this multiplication the vector is interpreted as a point rather than a direction. It'll give an outcome, but it depends on the units chosen and isn't what you're intending. So best to create a line and rotate it that way:

    coneAngleRotation = rotationAround(rotationAxis, angle);
    var toPlaneNormalLine = line(point, toPlaneNormal);
    toPlaneNormalLine = coneAngleRotation * toPlaneNormalLine;

    toPlaneNormal = toPlaneNormalLine.direction;
  • jelte_steur_info
    jelte_steur_info Member Posts: 675 PRO
    edited October 2024

    note: this vector transform only works in the proper order: transform * vector.

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