Join EJ Hassenfratz for an in-depth discussion in this video Adding a Constraint tag to keep parts aligned, part of Mograph Techniques: Rigging a Robot Arm in Cinema 4D.
…To make the process of animating this robot arm as streamlined…and efficient as possible, we're going to allow for our goal…null to be able to control all the movement our arm…makes, including even the rotation of the robot arm base here.…So right now, our goal null is controlling the direction and…rotation of our arm, but our robot arm shoulder base is stationary.…So we're going to change that.…So to do this, we're going to add a constraint tag to…have the robot arm's base axis aimed always at the goal null.…
So wherever we move our goal null, the base…axis is going to be aiming at that goal null.…So, first though we need to create a new…null and drag the entire robot arm rig underneath it…and this is because we don't want to apply any tags…or anything to our root here because it's an integral…part of our actual IK chain.…So, we are going to drag all of this underneath…a new null and we'll just call this null main.…And this is the null we'll apply our constraint tag to.…So, to apply a constraint tag, we're just…
- Setting up the model
- Creating an IK chain
- Adding animation controls
- Constraining position, scale, and rotation
- Adding depth of field and motion blur in After Effects