Microsoft HoloLens 图像捕获不起作用答案

【问题标题】：Microsoft HoloLens image capture not workingMicrosoft HoloLens 图像捕获不起作用
【发布时间】：2020-06-22 20:40:05
【问题描述】：

我正在尝试使用 HoloLens 捕获图像。我接受使用 HoloLens 相机的许可。

我正在使用此代码

using UnityEngine;
using System.Collections;
using System.Linq;
using UnityEngine.XR.WSA.WebCam;
using UnityEngine.UI;

public class WebCamera : MonoBehaviour
{
    PhotoCapture photoCaptureObject = null;
    Texture2D targetTexture = null;


    // Use this for initialization
    void Start()
    {
        Resolution cameraResolution = PhotoCapture.SupportedResolutions.OrderByDescending((res) => res.width * res.height).First();
        targetTexture = new Texture2D(cameraResolution.width, cameraResolution.height);

        // Create a PhotoCapture object
        PhotoCapture.CreateAsync(false, delegate (PhotoCapture captureObject) {
            photoCaptureObject = captureObject;
            CameraParameters cameraParameters = new CameraParameters();
            cameraParameters.hologramOpacity = 0.0f;
            cameraParameters.cameraResolutionWidth = cameraResolution.width;
            cameraParameters.cameraResolutionHeight = cameraResolution.height;
            cameraParameters.pixelFormat = CapturePixelFormat.BGRA32;

            // Activate the camera
            photoCaptureObject.StartPhotoModeAsync(cameraParameters, delegate (PhotoCapture.PhotoCaptureResult result) {
                // Take a picture
                photoCaptureObject.TakePhotoAsync(OnCapturedPhotoToMemory);
            });
        });
    }

    void OnCapturedPhotoToMemory(PhotoCapture.PhotoCaptureResult result, PhotoCaptureFrame photoCaptureFrame)
    {
        // Copy the raw image data into the target texture

        photoCaptureFrame.UploadImageDataToTexture(targetTexture);

        // Create a GameObject to which the texture can be applied
        GameObject quad = GameObject.CreatePrimitive(PrimitiveType.Quad);
        Renderer quadRenderer = quad.GetComponent<Renderer>() as Renderer;
        quadRenderer.material = new Material(Shader.Find("Custom/Unlit/UnlitTexture"));

        quad.transform.parent = this.transform;
        quad.transform.localPosition = new Vector3(0.0f, 0.0f, 3.0f);

        quadRenderer.material.SetTexture("_MainTex", targetTexture);

        // Deactivate the camera
        photoCaptureObject.StopPhotoModeAsync(OnStoppedPhotoMode);
    }

    void OnStoppedPhotoMode(PhotoCapture.PhotoCaptureResult result)
    {
        // Shutdown the photo capture resource
        photoCaptureObject.Dispose();
        photoCaptureObject = null;
    }
}

这个脚本被附加到一个空的游戏对象上。

我收到以下错误

ArgumentNullException:  Value cannot be null
Parameter name: shader.UnityEngine.Material..ctor(UnityEngine.Shader shader) (at <00000000000000000000>:0)

请任何人帮助捕捉图像。我哪里做错了？

【问题讨论】：

这行代码是否会引发此错误：quadRenderer.material = new Material(Shader.Find("Custom/Unlit/UnlitTexture")); 如果您已注释此代码行，则不可能以相同的消息引发异常。您能否确认最新的异常和错误消息？作为测试，请创建一个测试着色器并调用 Shader.Find() 来获取它。

标签： c# unity3d camera hololens image-capture

【解决方案1】：

它正在寻找位于此处的着色器“Custom/Unlit/UnlitTexture”。哪个可能不可用。我建议注释掉该行以确定它周围的其他代码是否有效。

【讨论】：