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Is there any way to turn a game object into a clickable button? I'd like to be able to make buttons without using unitygui.
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http://answers.unity3d.com/questions/143480/raycasthit-explanation-wanted.html see this answer you will get idea about ray cast hit make the camera as Main Camera
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Your answer
Yes, you can use Collider.raycast along with mouse screen coordinates to find out if the player has clicked a given object. However, implementing this kind of thing is much more difficult than using UnityGUI, so only do it if you really have to.
OnMouseDown(){ do this; do that; } attached to some game object makes it clickable, but doesn't turn it into a button.
try to use ray cast hit