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Question by ClaytonKashuba · Aug 04, 2016 at 05:36 AM · rotationrotate objectrotation axis

Rotating a bone upwards relative to camera.

Hello, I have been trying to achieve this result but to no avail. I want to rotate a limb upwards relative to space.world or camera view. So that when a user presses UP, the bone rotates upward, or Down for downward. This is difficult to explain so I attached a picture to illustrate the desired result. As you can see, I have the horizontal movement exactly as I want it. It's just the vertical movement I'm having problems with.

alt text

I feel the answer is easy to someone who has experience, but I have trouble even explaining my desired result into google to find an answer. So your help is greatly appreciated.

rotate-joint-problem.png (503.9 kB)
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avatar image ClaytonKashuba · Aug 09, 2016 at 08:54 AM 0
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targetLimb.transform.Rotate(-yy, 0, 0, Space.World);

This code would work if I can get the angle to the horizontal center (pointing towards the camera). The line marked in blue is the horizontal angle it takes to reach the center, the up/down value is applied and then the horizontal angle is restored. this would work perfectly.

Do you know how I can get the specific angle to the horizontal center? Or is there an easier way to achieve this?

alt text

rotatejoint2.png (393.7 kB)

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Answer by aditya-tfg · Aug 09, 2016 at 02:41 PM

Hi,

I am not sure if you are looking for this, but if you know your start and end vectors, you can get angle between them using Vector3.Angle(v3A, v3B). http://docs.unity3d.com/Documentation/ScriptReference/Vector3.Angle.html.

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