rotate a vector and points

otaolafr

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....

ilya_baran

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);

otaolafr

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

Without the specific error (including line number) and the whole feature, it's impossible to debug.  Please post a link to a public document.

otaolafr

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

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

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)

jelte_steur814

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_steur814

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