AddTorqueを使ってロール軸を水平にしたい

[turbotanaka]

Rotate physics object towards camera direction over time

I was toying with this not so long ago and wrote a full [PID controller][1], 2 in fact. And it worked but become a small nightmare to maintain. I then played with vSpring in the engine which is a simplified PID or so I assumed, but the results were underwhelming. Or I never figured out how to use it correctly. And then I wrote this dumbed down version which worked surprisingly well for what I needed - minimum complexity and just enough fidelity and control. It works well in 6DOF and does not i…

上記トピックにある方法を使ってPawnの制御をしているのですが、ピッチを傾けた状態でヨーをかけるとPawnが横倒しになってしまいます。なのでロール軸を水平にする機能を付け加えたいのですが、ベクタの計算に不慣れでやり方が分かりません。
物理の挙動を損ないたくないのでSetRotationのように無理矢理回転を修正したり、回転にロックをかけるのではなく、AddTorqueを使ってロールを修正したいです。どうすれば可能でしょうか。

[Everynone]

Torque works with the right vector for pitch (but it all depends on the setup, ofc). You could use forward and up vectors to achieve other rotations - do note there is a difference between adding world torque and local space torque. There are (inverse) transform nodes to help out here or we can unrotate a vector, too.

Also, adding torque on all 3 axis simultaneously would be very difficult for the player to control. Depending on what the end goal is, consider implementing it in a such a way that they can use 2 axis at a time only.

It gets even more difficult if you want an algorytm that can arrest angular momentum and / or produce enough counter-torque to achieve a specific rotation for a spinning body. Example of what I’m talking about:

How to counter angular momentum with torque

I’m trying to apply torque in such a way that the rotating cube (forward red arrow) arrives at the target (pink) and has its rotation completely arrested, without overshooting too much or excessive oscillations. I’m applying constant torque. As we build up angular velocity, at some point we must start producing counter-torque in order to slow down and come to a full stop. [image] How do I detect that moment? What’s the math behind it? I feel I need to take advantage of the Inertia Tensor h…

And then you may need to look into a nested PID controller.

[turbotanaka]

Thanks for answering my question.

I tried tilted the getted Pawn’s direction to the Z axis by 90 degrees and tried to match the Right vector.
Unfortunaly, this method’s barely worked. A misalignment occurred and Pawn’s unable to accurately track camera orientation.

Any suggestions for improvement?