// Implements Edge Detection using a Roberts cross filter.

using UnityEngine;

[ExecuteInEditMode]
[AddComponentMenu("Image Effects/Edge Detection")]
public class EdgeDetectEffect : ImageEffectBase
{
    public float threshold = 0.2F;

    // Called by camera to apply image effect
    void OnRenderImage(RenderTexture source, RenderTexture destination)
    {
        material.SetFloat("_Treshold", threshold * threshold);
        Graphics.Blit(source, destination, material);
    }
}