how to rotation a line to another line?

[hzsyber]

i have a problem, how to rotation a line to another line.
line a(x,y,z) b(x-10,y,z) parallel on axis X.
point c(0,0,0).

i need line ab rotation around point a to line bc.
photo:

i try code:

Code: Select all

void rotateVectorAroundAxis(vector3df& vector, const vector3df& axis, f32 radians)
{
   quaternion MrQuaternion;
   matrix4 MrMatrix;
   (void)MrQuaternion.fromAngleAxis(radians, axis);
   MrQuaternion.getMatrix(MrMatrix);
   MrMatrix.rotateVect(vector);
}

vector3df CenterAxisRotation(vector3df a, vector3df b, vector3df c)
{
	vector3df linea = (b - a);
	vector3df lineb = (c - a);
	vector3df cp = linea.crossProduct(lineb);
	f32 radians = acos(a / sqrt(pow(a.x,2)+pow(a.y,2)+pow(a.z,2)));
	vector3df ResRot = a;
	rotateVectorAroundAxis(ResRot, cp, radians);
	return ResRot;
}

but it no work.why?how to do?

thanks all!

[hzsyber]

help please.

[hzsyber]

why nobody answer me?