webcamのデモ。適当なcubeにアタッチして使う。カメラの初期化に時間がかかるため、SettingFOVは数フレーム待つか毎フレーム呼ぶ必要がある。

WebCamTextureFOV

using UnityEngine;
using System.Collections;

public class WebCamTextureFOV : MonoBehaviour
{
  private WebCamTexture webcam = null;
	private bool isPlaying = false;
	
	public bool cameraPositionAuotSetting = true;
	
	void Start ()
	{
		if (cameraPositionAuotSetting) {
			transform.position = Vector3.zero;
			Camera.mainCamera.transform.position = Vector3.zero + Vector3.back * 10;
		}
	}
	
	void OnGUI ()
	{
		if (!isPlaying) {
			if (GUILayout.Button ("camera on", GUILayout.Height (100))) {
				CameraOn ();
				isPlaying = true;
			}
		} else {
			if (GUILayout.Button ("set FOV", GUILayout.Height (100))) {
				SettingFOV ();
			}
		}
	}
	
	void CameraOn ()
	{
		webcam = new WebCamTexture (WebCamTexture.devices [0].name, 10000, 10000, 15);
		renderer.material.mainTexture = webcam;
		webcam.Play ();
	}
	
	void SettingFOV ()
	{
		transform.localScale = new Vector3 (webcam.width, webcam.height, 1);
		Camera.mainCamera.orthographicSize = webcam.height / 2;
	}
}