Unity - Scripting API: HandleUtility.DistanceToCircle
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Declaration
public static float DistanceToCircle(Vector3 position, float radius);
Description
Returns the distance in pixels from the mouse pointer to a camera facing circle.
Calculates the screen space distance from the mouse pointer to the circle at given world
space position with the given radius. The circle is assumed to be facing the camera.
Uses the current camera to determine the distance.
Additional resources: DistanceToDisc.