Rotate sphere, so that any fixed point on the sphere points at the camera.

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Hello all!

My question is as follows, I have a sphere (earth), and I want to rotate it so that any fixed point of my choice on the sphere points directly at the camera.

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Answer by homer_3 · Feb 24 at 04:44 PM

If you are able to get the exact point in space of the sphere that you want to look at the camera, I think this should work

 Vector3 toPoint = (spherePoint - sphere.transform.position);
 Vector3 toCamera = (camera.transform.position - sphere.transform.position);
 Quaternion rotateBy = Quaternion.FromToRotation(toPoint, toCamera);
 sphere.transform.rotation = rotateBy * sphere.transform.rotation;

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Keeinor · Feb 24 at 08:35 PM 0

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Thanks for the reply, that method works great on some points, but not all points.

Would you happen to have an alternative way? or any reference I can follow?

homer_3 Keeinor · Feb 24 at 09:14 PM 1

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Quaternion math is tricky since it's not communicative. I just tested it out and on the last line, you just have to multiply in the opposite order. So it should be sphere.transform.rotation = rotateBy * sphere.transform.rotation;

Keeinor homer_3 · Feb 24 at 09:20 PM 0

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Great it works perfectly now, thank you!

Rotate sphere, so that any fixed point on the sphere points at the camera.

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