Screenshot from a rendertexture (non-main camera) to fit sprite (in 3D space) exactly

Questions & Answers
1

How do you adjust or otherwise set up a screenshot to have the exact dimensions of a particular sprite that is in 3D space (so, Gameobject with SpriteRenderer).

The render camera is set up directly above the sprite but has some black space outside.

2

cant test this but should work

	void CreateSprite () {

        int pixels = 100;//change the amount of pixels per unit here
        var texture = new Texture2D(pixels, pixels, TextureFormat.ARGB32, false);

        string path = Application.dataPath + "/Image.png";
        ScreenCapture.CaptureScreenshot(path);

        byte[] data = null;

        if(File.Exists(path))
        {
            data = File.ReadAllBytes(path);
        }
        else
        {
            Debug.Log("Screen wasnt captured?");
            return;
        }

        texture.LoadImage(data);
        Color[] pix = texture.GetPixels(); 
        for (int i = 0; i < pix.Length; i++)
            pix_.a = pix*.grayscale;*_

texture.SetPixels(pix);
texture.Apply();

GetComponent().sprite = Sprite.Create(texture, new Rect(0.0f, 0.0f, texture.width, texture.height), new Vector2(0.5f, 0.5f), pixels);
}