Cylinder direction not unique.

[Sassafrass6]

Description

Directions passed to the cylinder actor do not refer to the unique axis of the cylinder.

Way to reproduce

from fury import actor,window
import numpy as np

scene = window.Scene()

centers = np.array([[-2,0,0],[0,0,0],[2,0,0]])
dirs = np.array([[1,0,0],[0,1,0],[0,0,1]])

arrows = actor.arrow(centers, dirs, dirs)
scene.add(arrows)

centers += np.array([0,1,0])
cyls = actor.cylinder(centers, dirs, dirs)
scene.add(cyls)

showm = window.ShowManager(scene)
showm.initialize()
showm.start()

[skoudoro]

Thank you for the feedback @Sassafrass6. we will look into it. If you have a fix, feel free to contribute!

Related to #531

[Sassafrass6]

I have solved the issue.
The problem arises because the orientation of vtkCylinderSource is along global y.
Ive introduced another argument into repeat_sources (in utils.py), called orientation, which can be set to a rotation matrix. If this new argument is set to something besides None, the matrix is applied as a transformation to the glyph before mapping it to an actor. This way, any time a vtkSource is not aligned with the X axis, it can be transformed (arbitrarily with the new orientation argument) before creating any actors.
Then, I add this orientation argument to the cylinder method in actors.py.

How would you like me to contribute the fix to the repository?