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Question by sdp · Feb 03, 2013 at 01:53 PM · directionforce

add force on an object to a certain direction

In my game, I have a winddirection, which is a number in degrees and is a variable. If my player is in the air, it has to drift to that direction (with addForce).

How do I implement this direction in the addForce function?

Thank you for your help.

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Answer by Dave-Carlile · Feb 03, 2013 at 02:10 PM

Since force is a vector, you need to convert your angle into a Quaternion to represent rotation, then use that to rotate a forward Vector3 so it points toward the angle.

The rotation transform happens by using the Quaternion * Operator.

 Quaternion rotation = Quaternion.Euler(xAngle, yAngle, zAngle);
 Vector3 direction = rotation * Vector3.forward;


The direction vector should now point toward angle. I haven't tested this, so it may require some tweaking, but this is the basic idea for converting an angle to a vector. Your best bet is to do this math only as the wind direction changes, and then use the vector for everything related to it.

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avatar image An3Apps · Dec 27, 2017 at 01:29 AM 0
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Thank you so much! I for some reason had to mulitply rotation by Vector3.right. I think its because my game is in 2D.

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Answer by That1phillps · Sep 18, 2020 at 06:38 AM

This worked for me like a charm! I needed to offset an object trajectory to only take the y coords from the main camera. I heart the you from 9 years ago, Dave.

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