TextureGray.cs

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using UnityEngine;

public class TextureGray {
    public static Texture2D ToGray(Texture texture){ // Should be moved out of HBallManager since it's also used for Surface Textures
        Texture2D tex2D = (Texture2D)texture;
        Texture2D grayTex = new Texture2D(tex2D.width, tex2D.height);
        float grayScale;
        float alpha;
        for (int y  = 0; y < tex2D.height; ++y) {
            for (int x  = 0; x < tex2D.width; ++x) {
                grayScale = tex2D.GetPixel(x, y).r * 0.21f + tex2D.GetPixel(x, y).g * 0.71f + tex2D.GetPixel(x, y).b * 0.07f;
                alpha =  tex2D.GetPixel(x, y).a;
                grayTex.SetPixel (x, y, new Color(grayScale, grayScale, grayScale, alpha));
            }
        }
        grayTex.Apply();
        return grayTex;
    }
    
    public static Texture2D ToGray(string resource_name){
        Texture text2D = (Texture)Resources.Load(resource_name);
        return(ToGray(text2D));
    }
}