Get Position At an Angle

Unity Engine
1

I am working on a 2d game where I need to calculate a position a set distance away from the player at an angle (in degrees). I don’t know how to get the position based on an angle.

any help would be appreciated!

2

multiple the angle by Mathf.Degree2Radian and use the sine and cosine functions on the x and y. (what goes where depends on how you want to orient the degree and vectors)

2 Likes
3

I like to just feed the number into a Quaternion and use it to rotate a vector.

If we agree that:

  • zero is straight up (Vector3.up)
  • your angle is in degrees in angle
  • the distance is in distance (world units)
  • whereIAmRightNow is where we are right now,

Then:

Vector3 distantPosition = whereIAmRightNow +
         Quaternion.Euler( 0, 0, angle) * Vector3.up * distance;

If zero is straight right, replace Vector3.up with Vector3.right,

If you are rotating around another angle besides Z (the example above), make adjustments.

etc.

2 Likes
4

this approach works but the angle is made in up direction only , the unity takes the up direction as origin . How can I get the angle at any desired origin like right.

5

Is angle relative to player forward direction. Or angle is in world space.
Is it top down 2d or side 2d game ?

1 Like
6

How will be it’s sol for side 2D game

7

No, Unity assumes nothing. Vector3 is just a vector, three floating point numbers, nothing more.

I assume Vector3.up in my example code above.

Read the first line for this assumption:

You can substitute any vector for the “zero,” such as Vector3.right if you prefer.

If the angle is going around clockwise and you want counter-clockwise, or vice-versa, then just use -angle instead of angle