I asked ChatGPT:
"If you want to use Inverse Kinematics (IK) to accomplish the animation transition, you would need to set up an IK solver that calculates the desired pose for the character’s arm based on the hit location.
Here’s a rough outline of how you could use IK in Unreal Engine to calculate the desired aim offset based on the hit location:
- Create an IK solver: You can create an IK solver by adding an “Anim Node” component to your character blueprint. There are several IK solver nodes available in Unreal Engine, including the “Aim Offset Look At” node and the “Two Bone IK” node.
- Define the end effector and target: You can define the end effector as the bone that you want to move, and the target as the hit location. The IK solver will then calculate the desired pose for the character’s arm that aligns the end effector with the target.
- Update the IK solver in real-time: You can update the IK solver in real-time by passing the hit location to the IK solver and calling the “Evaluate” function to recalculate the desired pose.
The “Calculate Aim Offset” function takes the local hit location as input and calculates the desired aim offset by passing the hit location to the IK solver and calling the “Evaluate” function to recalculate the desired pose. The “Apply Aim Offset” function takes the calculated aim offset as input and applies it to the character’s arm bones to achieve the desired aim animation.
Note that this is just a rough example, and the actual implementation would depend on the specific requirements of the project. You may need to adjust the IK solver node and the formula for passing the hit location to the IK solver to get the desired result."