无法在统一C＃中按顺时针方向旋转图像

Question

I have an image to be rotated in a pivot point(top) through animation. I am able to rotate it in anti-clockwise direction by simply changing the z-rotation value. But I want to rotate an image in clockwise direction.

If I put a z-rotation value -45 degree, unity converts it to 315 degree and rotates an image in anti-clockwise direction.

The image to be rotated has pivot point at top as shown in the figure below.

Answer 1

You could lerp the angle (single float) instaed of the entire rotation. Lerp from your min angle to max angle and just directly set ,rotation = Quaternion.Euler(0,angle,0).

There shouldn't be any issue with wrapping from 0 to 360; those are the same rotation (and so are 720 and -360, etc).

(you can't force slerp to go a different direction; it's wired to take the shortest route, just like lerp is (though, understandably, it's harder to tell with lerp))

maybe this code help :

 needleHub.transform.localRotation = Quaternion.Euler(0, 0, Mathf.LerpAngle(90f, -90f, lerpFactor));

Answer 2

Try changing the interpolation type. I remember having almost the exact same problem and fixing it by changing the interpolation to something other than Eulers Angles.

Answer 3

Thanks @UriPopov for your reference . Finally I am able to rotate an image in clockwise direction through animation. I change the rotation to EulerAngles(Quaternion) as said by UriPopov. But main point to be remember during this animation is that each animation frame should be considered. If one frame is placed empty, then the animation will be in anti-clockwise direction.