Changing Video Cam Texture Material With Buttons

I have this script that allows video to be played on a plane, I was trying to figure out how to change the material on the plane the web cam video plays on because the effect is cool, but I'm not having a lot of luck. This us the Video player script I'm using:

 using UnityEngine; // 41 Post - Created by DimasTheDriver on July/22/2012 . Part of the 'Unity: capturing the video input from multiple webcams' post. Available at: http://www.41post.com/?p=4854.
 using System.Collections;
 
 public class MultipleWebCamPreview: MonoBehaviour 
 {
 
 
 
     //The texture that holds the video captured by the webcam
     private WebCamTexture webCamTexture;
     
     //An array that stores a reference to the names of all connected webcams
     private string[] nameWebCams;
     
     //The current webcam
     private int currentCam = 0;
     
     //The selected webcam
     private int selectedCam = 0;
     
     void Start()
     {
         //An integer that stores the number of connected webcams
         int numOfCams = WebCamTexture.devices.Length;
         
         //Initialize the nameWebCams array to hold the same number of strings as there are webcams
         this.nameWebCams = new string[numOfCams];
         
         //Get the name of each connected camera and store it into the 'nameWebCams' array
         for(int i = 0; i<numOfCams; i++)
         {
             this.nameWebCams[i] = WebCamTexture.devices[i].name;            
         }
         
         //Initialize the webCamTexture
         webCamTexture = new WebCamTexture();
         //Assign the images captured by the first available webcam as the texture of the containing game object
         renderer.material.mainTexture = webCamTexture;
         //Start streaming the images captured by the webcam into the texture
         webCamTexture.Play();
     }
     
     void OnGUI()
     {
         //Render the SelectionGrid listing all the cameras and save the selected one at 'selectedCam'
         selectedCam = GUI.SelectionGrid(new Rect(20,20,200,50), currentCam, nameWebCams, 1);
         
         //If the selected camera isn't the current camera
         if(selectedCam != currentCam)
         {
             //Assign the value of currentCam to selectCam
             currentCam = selectedCam;
             //Stop the streaming of captured images
             webCamTexture.Stop();
             //Assign a different webcam to the webCamTexture
             webCamTexture.deviceName = WebCamTexture.devices[currentCam].name;
             //Start streaming the captured images from this webcam to the texture
             webCamTexture.Play();
         }
     }
 
 
 }

and this is the script I came up with to change the material on the plane using buttons but as I say I can get the material to change but it does not do the same thing as when I play the scene and drag a material into the plane's material slot, only then do I get the effect I want????

 using UnityEngine;
 using System.Collections;
 
 public class VideoScreenManager : MonoBehaviour {
 
 
 
     //Material Reference
     public Material newMaterialRef01;
     public Material newMaterialRef02;
     public Material newMaterialRef03;
     public Material newMaterialRef04;
     public Material newMaterialRef05;
     public Material newMaterialRef06; //Default White Material
 
 
     public void  GoColor01(){
         renderer.material = newMaterialRef01;
 
     }
 
     public void  GoColor02(){
         renderer.material = newMaterialRef02;
         
     }
 
     public void  GoColor03(){
         renderer.material = newMaterialRef03;
         
     }
 
     public void  GoColor04(){
         renderer.material = newMaterialRef04;
         
     }
 
     public void  GoColor05(){
         renderer.material = newMaterialRef05;
         
     }
 
 
     public void  GoColor06(){
         renderer.material = newMaterialRef06;
         
     }
 }