rotating around an axis in the space

Programming Questions

bluurryy

rotating around an axis in the space

in Programming Questions • 3 years ago

I've got an equation that allows to calculate the coordinates of a point if it was rotated around an axis that is given in a space with three angles.. But now, how can I calculate these angles?

if I've got a vector.. can I do this with the tan() or how is that possible?

thanks for your help....

Replies(2)

blindfish

Re: rotating around an axis in the space

3 years ago

If you know the x/y coordinates of two points that make a line then you can get the angle with atan2(). Maybe that's what you're after? Otherwise draw a diagram of what you're trying to do... your description isn't entirely clear.

bluurryy

Re: Re: rotating around an axis in the space

3 years ago

I'm talking about an affine space..

There I've got a point (x,y,z)... And this point I'd like to rotate around an axis that's given with u,v,w. (a vector),

now there's an equation to solve it with these three values, but I have to solve it with an equation that says:

x',y',z'=D-matrix(alpha,beta,gamma,point x, point y, point z) * (x,y,z)

so I should calculate the coordinates of the new point with an equation that depends on a point (point x, point y, point z) and three angles alpha, beta, gamma.

but I don't know how to get the angles when I just have a vector..

(in three dimensions)

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