June 8, 2015
Drawing a circle using Gizmos in Unity3D
In Unity game engine editor, there are options to draw a box or a sphere in Gizmos. At times, we may need to draw simple 2d circles using Gizmos. But there is no API for drawing circles in gizmos. There is a method to draw lines in gizmos, we can use that method to draw multiple connected lines to make a circle. The code is given below;
#pragma strict
@script ExecuteInEditMode()
var Radius:float = 4;
function OnDrawGizmosSelected(){
var T:Transform = GetComponent(Transform);
Gizmos.color = Color.white;
var theta:float = 0;
var x:float = Radius*Mathf.Cos(theta);
var y:float = Radius*Mathf.Sin(theta);
var pos:Vector3 = T.position+Vector3(x,0,y);
var newPos:Vector3 = pos;
var lastPos:Vector3 = pos;
for(theta = 0.1;theta<Mathf.PI*2;theta+=0.1){
x = Radius*Mathf.Cos(theta);
y = Radius*Mathf.Sin(theta);
newPos = T.position+Vector3(x,0,y);
Gizmos.DrawLine(pos,newPos);
pos = newPos;
}
Gizmos.DrawLine(pos,lastPos);
}You can add this script into a component and when we select the gameobject we can see the circle. Thanks for reading.
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