Align X axis of one object according to another

Question

Hello guys, i'm currently working on a Climbing ledge system, and i'm almost done, but i'm having a problem to place the character on the right place when he grabs the ledge. Currently, i'm using transform.rotation.eulerAngles to make my character face the ledge, and then i transform the positions z and y of my characters to match the ledge, and it works fine, just like Pic 1! but, if i rotate the platform, the character will match the global Z position from the center of the ledge ( just like Pics 2 and 3 ), and that's obviously causes some errors. then, i decided to try another method:

After i rotate my character to face the ledge, i could make the X axis of my character match the X axis of the ledge ( see pic 4 ). but i don't know how to make t$$anonymous$$s... if its possible, can someone help me? and if you guys can come up with a simpler solution, its fine too :)

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Answer 1

Answer by robertbu · Oct 31, 2013 at 02:58 PM

Assuming they are parallel you can do:

 character.right = ledge.right;

If you want to do it over time:

 var q = Quaternion.FromToRotation(character.right, ledge.right);
 transform.rotation = Slerp(transform.rotation, q * transform.rotation, speed * Time.deltaTime);

Note t$$anonymous$$s does not take into account front or back. That is, t$$anonymous$$s aligns the 'right' vectors of both, but a ledge has two edges and your alignment will be 180 degrees different dependent on w$$anonymous$$ch edge is used. If t$$anonymous$$s is an issue, you can check the angle:

 var align : Vector3;
 if (Vector3.Angle(character.right, ledge.right < 90)
     align = ledge.right;
 else 
     align = -ledge.right;
 
 var q = Quaternion.FromToRotation(character.right, align);
 transform.rotation = Slerp(transform.rotation, q * transform.rotation, speed * Time.deltaTime);

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ThiagoTejo · Oct 31, 2013 at 03:30 PM 0

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robertbu · Oct 31, 2013 at 03:37 PM 0

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ThiagoTejo · Oct 31, 2013 at 03:56 PM 0

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robertbu · Oct 31, 2013 at 05:57 PM 0

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aybeone · Jun 03, 2015 at 08:27 PM 0

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Align X axis of one object according to another

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