LookAt rotate around X

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I know this has been asked and answered a million times , mostly relating to y rotation for turrets etc. but.....

I am trying to make a Cube (1) Rotate around its X Axis only. To look at another Cube object (creating a Flap ). Local Z is facing forward correctly ,Y is Up. Using below simple code, Cube (1) snaps to look at World Z

  targetPostition = new Vector3 ( transform.position.x, target.position.y, target.position.z );
             transform.LookAt(targetPostition);

If I set it to :

  ... new Vector3 ( target.position.x, **transform.position.y**, target.position.z );

Cube(1) stays facing forward in local position and rotates perfectly around Y only, but I need to rotate around X.

I have been through tons of answers here and elsewhere , have also tried using Quaternion.LookRotation , but again with .x restricted to transform.position . Cube(1) looks towards World Z only.

Im well and truly stuck here, any suggestions greatly appreciated

Answer 1

Best Answer

Answer by Hellium · Jan 16 at 07:53 PM

 private void Update()
 {
     targetPosition = transform.position + (Vector3.ProjectOnPlane(Target.position - transform.position, transform.right));
     transform.LookAt(targetPosition);
 }

This will keep the rotation of the object on its Y and Z intact while rotating the object along its X axis.

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Dan-Gilbert · Jan 16 at 08:44 PM 0

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NOTE: targetPosition apologies for my mis spelling !

Thank you very much for replying This only seems to work if the target cube is moved into a position so that Cube(1) is again looking in World Z direction.

alt text

ProjectOnPlane () has fried my brain , especially after spending all day frustrated with what i though would be a simple process.

i just want to rotate the long cube like a wing flap around x only ( will be making target a grabbable object in XR Interaction.

If there is a more suitable solution please let me know .

Thanks everyone ))

lookat.jpg (204.0 kB)

Hellium Dan-Gilbert · Jan 16 at 09:37 PM 0

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I've updated the script and fixed an issue when the object wasn't at the origin, I hope it will fix the issue you're having.

The LookAt method is meant to align the Z axis towards the target position.

Dan-Gilbert · Jan 16 at 09:50 PM 0

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Fantastic. That works perfectly. I hate to just paste stuff in without knowing how it works , but now i can get over this hurdle and onto the next one.
Thank you ever so much for your help

LookAt rotate around X

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