Section 19: The Arms
This is it! The final section of “Animation Master Character Rigging Basics (Part 1)“!
All that is left to do now are the arms so let’s finish this up now.
Now let’s do the arms.
We will use the same approach that we used with the leg; we’ll set up one arm and then we will let the MirrorBone plug-in do the other arm for us.
With this part of the model you may feel comfortable enough to not hide or lock any of the geometry. If you do, go for it.
We are going to create a branch of four bones.
The parent for this branch will be “(GEO) Spine 3”.
The branch will consist of a shoulder bone (which I will not be assigning CPs to at this time but you can do it if you wish to try it out.)
The next bone will be the bone for the upper arm.
Next comes the forearm bone.
Finally we’ll make a hand bone. There are no fingers on the robot’s hands so we do not need to set up finger bones.
As you can see in the image on the left the shoulder bone is not attached to its child bone.
We are going to attach the hand bone to the forearm and then the forearm to the upper arm. Don’t attach the bone for the upper arm to the shoulder.
Remember this will make those bones an IK chain so let’s select the “Lock IK” option for the attached arm bones too.
I have chosen to point all of the arm branch’s roll handles back towards the rear of the model.
You may do this as well or you may choose to point them forward, in the same direction as the leg. The choice is yours, just make sure that each bone’s roll handle is pointed the same way throughout its chain.
Let’s rename these bones now if you have not done so yet and double check the hierarchy.
Now that the robot’s right arm is done and the bones are the way they should be we are going use the MirrorBone plug-in to rig the other arm for us.
For this step you should choose “(GEO) Right Shoulder” as the bone to mirror.
Once you do that you should be done!
All you need to do now is to check your “Bones” folder in the PWS to make sure that MirrorBone did its job correctly then check your model in an Action window.
We are finished with the geometry bone set-up!
Experiment more in an Action window with this model.
In the Character Rigging Part 2, we’ll learn about what constraints are and how we can use them to make our rigs better.
Next: Section 20: Conclusion