I’ve hit a wall with this issue and I’m not sure if it’s a bug with control rig or if I’m just doing something completely wrong.
I’m trying to create a weapon aiming system using control rig’s full body IK which simply sets the transform of the hand so that the character is aiming in the right direction. However, I’m running into this issue where the hand’s transform stutters terribly whenever the character is rotating and makes the aiming utterly inaccurate.
I’ve been able to replicate this issue using a fresh third person project with the default character setup as you can see from this video -
The red arrow is the raw aim transform while the blue arrow/line trace is the resulting transform relative to the skeleton which is used to set the control rig’s hand transform, so the math doesn’t seem to be causing the issue here at least. But you can see how whenever the character rotates or changes direction, the hand will stutter and diverge from the transform that is being passed to the control rig.
The setup for the aim system is fairly straight forward and runs on tick inside the character blueprint -
First I’m getting the desired aim location based on the camera -
Then I’m setting the aim transform for where I want the character’s hand to be (red arrow) -
I’m then using the aim transform (red arrow) to calculate what the hand transform should be relative to the skeleton (blue arrow) and passing the resulting transform to the anim BP -
The anim BP then sets the transform of the hand control in the control rig -
Which is then used to set the transform of the effector for the hand in the full body IK -
I feel like I either must be approaching this the wrong way, using the wrong method, or running into an inherent flaw or bug with how control rig handles full body IKs. Any suggestions, tips, resources, or alternative approaches to help resolve this issue would be greatly appreciated!
I’ve uploaded the test project here as well in case anybody would like to take a gander -