I need rotatable directional lights for the game that I am making, to show the player what their 2D character can see.
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Pin a cone sprite to the character. You can apply some effect (like "Lighten") to it or a blend mode. See this post for an example:
construct.net/forum/construct-2/how-do-i-18/how-do-i-make-an-enemy-line-of-130966