ROT XYZ From Vector3D?

[Atom]

Hi All,

I have a bone located at world origin. I also have a direction(i.e. vector) and a length.

So I want the bone to point along the direction. To do this I need to populate the Rotation fields of the bone.

How do I take the direction and length and produce 3 rotation values in degrees that I can supply to the bone?

Example data from Acclaim .asf file.

     direction 0.611804 -0.747784 0.257906
     length 2.29243
	

Edited July 31, 2016 by Atom

[animatrix]

If your length represents the amount of rotation around that axis, you can use quaternion(angle, axis).

Then qconvert to convert it into matrix3 and then cracktransform to extract the rotation out of this matrix3.

[MrScienceOfficer]

Assuming you're using python it's quite simple,

bone = hou.Vector3(0,0,-1) #Bones in Houdini are oriented down the -Z axis by default
vector = hou.Vector3(your normalized vector here)
rotation = bone.matrixToRotateTo(vector)
eulerAngles = bone.extractRotates()