Raycasting with global position

Question

I want to shoot a Raycast from an object to a Vector 3. The Raycast should always shoot in the direction of the Vector3 even if I move the Object. This is the code I use:

 Debug.DrawRay (transform.position, new Vector3(0,10,0), Color.green);

However, when I move the Object that casts the Ray, the ray shoots to the local 0,10,0 and not to the global 0,10,0.

How do I make it shoot in the direction of a global Vector3?

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Answer 1

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Answer by Vetm · Dec 14, 2014 at 03:16 PM

I found the answer myself. Since the second argument in Debug.DrawRay is a direction and not a position you have to calculate to direction where the ray should point at. This is how you do it.

 Debug.DrawRay (transform.position, -(transform.position-new Vector3(0,10,0)), Color.green);

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Professor Snake · Dec 14, 2014 at 03:18 PM 0

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Fantastic. Although i don't think calling new Vector3(0,10,0) every frame is all that optimal since, to my knowledge, it would lead to a memory leak. You should replace it with just Vector3(0,10,0)

Vetm · Dec 14, 2014 at 03:23 PM 0

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The new Vector3 is just a placeholder for the Player Position. I thought it would sound more complicated if I added the Player Position and it would sound more specific so others with the same problem couldn't relate it to their problem.

Answer 2

Answer by Professor Snake · Dec 14, 2014 at 03:05 PM

The second argument in Debug.DrawRay is used as a direction, not a position. If you'd like to draw a line between an object and a point, use Debug.DrawLine instead. If you want it to point towards said point and have a variable length, use Debug.DrawRay(origin.position,(target.position-origin.position).normalized*length);

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Raycasting with global position

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