Is this way of making a raycast correct

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Hi, I was having problems for checking if there was an object between the cámera and my player. I finally used this:

ray = camera.ScreenPointToRay(camera.WorldToScreenPoint (tr.position));

Is that correct?

Answer 1

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Answer by DaveA · Mar 20, 2012 at 10:47 PM

Depends on what you mean by 'camera'. If you mean 'in view of the camera' then do you mean from the center of the view? If you mean the object holding the camera, then you can construct a Ray between that object's transform and the player and see if it hits anything before the player.

But in short, if it works, hey, ok.

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troneras · Mar 21, 2012 at 12:02 AM 0

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Thanks. Yes, I refeer to the first, I have the camera following the player and always looking to the player position. Because the player it's always at the center I tryed to pass Vector3(0.5,0.5,1.0) but it doesn't work. I think in my case that would be the best solution(if it worked).

troneras · Mar 21, 2012 at 09:37 AM 0

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lol..Ok I was thinking in other thing, the Screen goes from 0 to Screen.height and from 0 to Screen.width. Not from 0 to 1...

Answer 2

Answer by troneras · Mar 21, 2012 at 12:07 AM

I found a better solution: In function Start() I keep the position of the sphere relative to the screen, it's center!:

midX = Screen.width/2; midY = Screen.height/2; screenPos = Vector3(midX,midY,1);

This way I have one less transform per update.

ray = camera.ScreenPointToRay(screenPos);

Since I always have my camera looking to the sphere, this works great.

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Is this way of making a raycast correct

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