Adding a collider on a list of vectors

Question

I'm trying to detect contours in a scene and add a collider to every detected object, I used the canny edge detector to get the coordinates of the detected objects.

Here is my output image

I need to add a collider to each black line to prevent my game object from going in/out of that area but I don't know how to do so exactly. The findContours function returns a list of detected contours each stored as a vector of points but how do I use that to generate a collider?

Thank you for your help.

Update

Here is my source code (for the update method)

 void Update ()
    {
        if (initDone && webCamTexture.isPlaying && webCamTexture.didUpdateThisFrame) {

            //convert webcamtexture to mat
            Utils.webCamTextureToMat (webCamTexture, rgbaMat, colors);
            //convert to grayscale
            Imgproc.cvtColor (rgbaMat, grayMat, Imgproc.COLOR_RGBA2GRAY);

            //Blurring
            Imgproc.GaussianBlur(rgbaMat,blurMat,new Size(7,7),0);
            Imgproc.Canny(blurMat, cannyMat, 50,100);
            Mat inverted = ~cannyMat;
            //convert back to webcam texture
            Utils.matToTexture2D(inverted, texture, colors);

            Mat hierarchy = new Mat();
            List<MatOfPoint> contours = new List<MatOfPoint>();
            Imgproc.findContours(inverted, contours, hierarchy, Imgproc.RETR_LIST, Imgproc.CHAIN_APPROX_SIMPLE);


        }
    }

Please share the code you are trying to implement in the question details. — aaronR, Apr 04 '18 at 15:38

score 0 · Accepted Answer · answered Apr 04 '18 at 14:46

0

Use a PolygonCollider2d.

You can edit the collider at runtime using the SetPath function, to which you will pass a list of 2d points (that you already computed using the findContours function.

You can have several paths in the polygon if you want your collider to have holes.

answered Apr 04 '18 at 14:46

Basile Perrenoud

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Yes, you can add colliders on 3d objects. The fact that it is a 2d collider doesn't change. Every object is 3d in unity. even the rect transform have a z value. You can add a collider using `AddComponent` In code. But you don't have to add a new one every frame, juste edit the list of point of an existing one – Basile Perrenoud Apr 05 '18 at 08:17

Adding a collider on a list of vectors

1 Answers1