https://docs.unity3d.com/es/2019.1/ScriptReference/HandleUtility.GUIPointToWorldRay.html
HandleUtility-GUIPointToWorldRay - Unity Scripting API
Convert 2D GUI position to a world space ray.
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https://docs.unity3d.com/ScriptReference/HandleUtility.WorldToGUIPoint.html
Unity - Scripting API: HandleUtility.WorldToGUIPoint
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