UnityでWeb Cameraをテクスチャにアサインし、そのテクスチャをPNGでセーブする例

WebCam.cs

using UnityEngine;
using System.Collections;
using System.IO;

public class WebCam : MonoBehaviour {
	public int Width  = 1280;
	public int Height = 720;
	public int FPS    = 15;

	public Material material;

	WebCamTexture webcamTexture;

	void Start () {
		WebCamDevice[] devices = WebCamTexture.devices;

		// display all cameras
		for (var i = 0; i < devices.Length; i++) {
			// get camera name
			string camname = devices[i].name;
			print(i+":"+camname);

			if ( camname == "RICOH THETA S" ) {
				webcamTexture = new WebCamTexture(camname, Width, Height, FPS);
				print ( webcamTexture );
				material.mainTexture = webcamTexture;
				webcamTexture.Play();
				break;
			}
		}
	}
	
	void Update() {
		if (Input.GetKeyDown (KeyCode.Space)) {
			if ( webcamTexture != null ) {
				SaveToPNGFile( webcamTexture.GetPixels(), Application.dataPath + "/../SavedScreen.png" );
			}
		}
	}

	void SaveToPNGFile( Color[] texData , string filename ) {
		Texture2D takenPhoto = new Texture2D(Width, Height, TextureFormat.ARGB32, false);
		
		takenPhoto.SetPixels(texData);
		takenPhoto.Apply();
		
		byte[] png = takenPhoto.EncodeToPNG();
		Destroy(takenPhoto);
		
		// For testing purposes, also write to a file in the project folder
		File.WriteAllBytes(filename, png);
	}
}