MovieManager.cs

using NatCamU;
using OpenCVForUnity;
using UnityEngine;

public class MovieManager : MonoBehaviour {
    [SerializeField] private Renderer _renderer;

    private Texture2D _destination;
    private bool _initialized;

    void Start() {
        NatCam.SetDebugMode();
        NatCam.Initialize(PreviewType.Readable);
        NatCam.SetActiveCamera(DeviceCamera.RearCamera);
        NatCam.SetResolution(ResolutionPreset.HD);
        NatCam.Play();
        NatCam.FocusMode = FocusMode.AutoFocus;
        NatCam.DetectTouchesForFocus = Switch.Off;

        NatCam.NatCamPreviewStartEvent += NatCamOnNatCamPreviewStartEvent;
    }

    private void NatCamOnNatCamPreviewStartEvent() {
        if (_initialized) {
            Debug.LogWarning("MovieManager: Already Initialized");
            return;
        }

        Debug.Log("MovieManager: Initializing " + System.DateTime.UtcNow);

        if (NatCam.PreviewMatrix == null) {
            Debug.LogError("MovieManager: Preview Mat is null");
            return;
        }

        // Fill texture with red to easily verify the texture is actually writting to later
        _destination = new Texture2D(NatCam.PreviewMatrix.width(), NatCam.PreviewMatrix.height(), TextureFormat.RGBA32, false);
        for (int x = 0; x < _destination.width; x++) {
            for (int y = 0; y < _destination.width; y++) {
                _destination.SetPixel(x, y, Color.red);
            }
        }
        _destination.Apply();
        _renderer.material.SetTexture("_MainTex", _destination);

        _initialized = true;
    }

    private void Update() {
        if (!_initialized) {
            Debug.Log("MovieManager: Not initialized yet");
            return;
        }

        Utils.matToTexture2D(NatCam.PreviewMatrix, _destination);
    }

    void OnDestroy() {
        NatCam.Stop();
    }
}