skeleton relationship

[ruddle]

Thank you so much.

[ruddle]

Sorry, two problems when I use your code.

1. I guess shoulderBone comes from getbone('skel_ShoulderL'). Then where is elbowBone from? I don't see a elbow bone in the skeleton.

2. If shoulderBone and elbowBone are from getbone(), maybe because my Vizard is only 2.17a, it doesn't support <bone>.getPosition command. Is there any substitute?

More question about version 2.17a:
It seems <bone>.setEuler doesn't work in this version too. Any substitute for setting the rotation of the bone?

Thanks,
ruddle

[farshizzo]

Hi,

Sorry, the code I posted was for Vizard 3.0. In 2.17, I believe the syntax for getting a bone position/rotation is the following:

pos = bone.get(viz.POSITION)
euler = bone.get(viz.EULER)

If you want the length of the upper/lower arm, then I believe you should be interested in the following bones:

skel_ArmLU
skel_ArmLL
skel_HandL

[ruddle]

This time it works. Thank you.

The results are:
The distance between skel_ShoulderL and skel_ArmLU is 0.144409524884.
The distance between skel__ArmLU and skel_ArmLL is 0.159618362784.
The distance between skel__ArmLL and skel_HandL is 0.00597032904628.
So I guess the length of upper arm is 0.14, and the lower arm is 0.15. Right?

[farshizzo]

Hi,

Actually that's incorrect. You need to get the absolute world position of the bone:

bone.get(viz.POSITION,viz.ABSOLUTE_WORLD)

This should give you the following results:

skel_ArmLU -> skel_ArmLL = 0.284790087668
skel_ArmLL -> skel_HandL = 0.290760380194

[ruddle]

Many thanks. Two more questions about viz.ABSOLUTE_WORLD:

1. Given the angle between shoulder and upper arms, and the angle between upper and lower arms, Can I set the arm like this:

LowArmBone.rotate(0,-90,0)
UpArmBone.rotate(0,-60,30)

What do I need to use: viz.ABSOLUTE_WORLD or viz.ABSOLUTE_LOCAL?

2. Given the position of hand, Can I set the hand like this:

HandBone.translate(x,y,z,viz.ABSOLUTE_WORLD)

Why only viz.ABSOLUTE_LOCAL works?


ruddle

[farshizzo]

Hi,

viz.ABSOLUTE_LOCAL will perform the rotation in the bones local coordinate system. viz.ABSOLUTE_WORLD will perform the rotation in the world coordinate system. There were some bugs with performing manual bone rotations in Vizard 2.x. I would recommend upgrading to Vizard 3.0 if possible.

Translating the hand with viz.ABSOLUTE_WORLD should work. Are you locking the bone before performing the translation?