This question was closed May 09, 2014 at 03:44 AM by robertbu for the following reason:

Multiple technical questions

Question by _Bidi_ · May 09, 2014 at 03:17 AM · collision collider linerenderer

Create a collider for area created by mouse

Hi all, sorry for my poor English, I want to create a game like this

alt text

For example, the requirement is 2 red balls and 2 yellow balls, then the user uses mouse to draw a shape in order to meet the requirement.

My logic is create a collider covered by the drawn line and check the collision with the balls. But I dont know how to make that. I've learn Unity for 1 weeks, please help ^^ All comments is much appreciated. Thanks!

require.png (10.2 kB)

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robertbu · May 09, 2014 at 03:43 AM 0

Unity Answers addresses questions with a single specific issue. Unity Forums is a better fit for high-level design questions like yours.

You have a number of individual technical problems:

How to draw a line
How to save a path
How to detect when a path is closed
How to detect what balls are inside the path

In turn each one of the above has a number of technical issues/decisions. Addressing the specific question of building a collider, you can build a mesh using an arbitrary path using this script from the Unity Wiki.

http://wiki.unity3d.com/index.php/Triangulator

A better solution to run through the line segments comparing all balls to each segment. For a ball to be inside the path, the ball must be on the same side of all line segments.

_Bidi_ · May 09, 2014 at 05:07 AM 0

Thanks for your comment, but now I've drawn path, auto close the path if it not closed. My problem now is detect how many balls inside and I think I can check by the collision. However, I dont know how to do that. How to create the collision for the area that created by the closed path. That is my question. Thanks for your consideration.