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Hello,
how can i change directly the x, y, z, (w) value of an existing point_3 
without
using transform?
I want to apply my own transformation on the point. I want to to change the x,
y, and z value for a point in a function and then return the same point with
the new values.

For example:

Point test(1.0,2.0,3.0)

Point transformation(Point in)
{

// in.x(5.3)    ???
// in.y(2.3)    ???
// in.z(6.4)    ???

return in;
}

transformation(test);