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Question by Gintas_ · Jun 21, 2013 at 08:54 AM · c#camerarandomcoordinatesrectangle

Random position in rectangle, but not in a camera view

How can make a random coordinates generation, that are in rectangle AND not in a camera view? alt text

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Answer by whydoidoit · Jun 21, 2013 at 09:36 AM

So iteratively it would be easy, but to ensure constant runtime performance, how about something like this.

    var screenRect = new Rect(20,20,400,400);
    var cameraRect = new Rect(50,50,100,100);

    var x = UnityEngine.Random.Range(screenRect.xMin, screenRect.xMax - cameraRect.width);
    var y = UnityEngine.Random.Range(screenRect.yMin, screenRect.yMax - cameraRect.height);

    x = x > cameraRect.xMin ? x + cameraRect.width : x;
    y = y > cameraRect.yMin ? x + cameraRect.height : y;
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avatar image Gintas_ · Jun 21, 2013 at 11:12 AM 0
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Thanks, but in order to get this working, I need to get camera's view bounds in world coords. How can I get them? Quick example from random image: http://i.imgur.com/GWF55Nc.png

avatar image whydoidoit · Jun 21, 2013 at 12:08 PM 0
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The view bounds in terms of what though? Pixels on the screen? Some kind of plane?

avatar image Gintas_ · Jun 21, 2013 at 12:26 PM 0
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Yes, I guess pixels on the screen, like in that image. By the way, if camera won't be rotated exactly top-down, then view won't be a normal rectangle, right? So I think this code won't work. Basically what I want to do, is I have a rectangle area and I want to spawn enemy in that area, BUT not in view of camera, so player won't see how it will spawn.

avatar image whydoidoit · Jun 21, 2013 at 12:28 PM 0
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So actually you want to spawn it on the plane on which it will walk right?

avatar image Gintas_ · Jun 21, 2013 at 12:30 PM 0
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Yes, kinda "on the ground".

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