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Showing content from https://docs.unity3d.com/Manual/sprite/../../ScriptReference/Windows.WebCam.PhotoCapture.html below:

Unity - Scripting API: PhotoCapture

PhotoCapture

class in UnityEngine.Windows.WebCam

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Description

Captures a photo from the web camera and stores it in memory or on disk.

Demonstrates how to take a photo using the PhotoCapture functionality and display it on a Unity GameObject.

using UnityEngine;
using System.Collections;
using System.Linq;
using UnityEngine.Windows.WebCam;public class PhotoCaptureExample : 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 our target texture
        photoCaptureFrame.UploadImageDataToTexture(targetTexture);
        // Create a gameobject that we can apply our texture to
        GameObject quad = GameObject.CreatePrimitive(PrimitiveType.Quad);
        Renderer quadRenderer = quad.GetComponent<Renderer>() as Renderer;
        quadRenderer.material = new Material(Shader.Find("Unlit/Texture"));
        quad.transform.parent = this.transform;
        quad.transform.localPosition = new Vector3(0.0f, 0.0f, 3.0f);
        quadRenderer.material.SetTexture("_MainTex", targetTexture);
        // Deactivate our camera
        photoCaptureObject.StopPhotoModeAsync(OnStoppedPhotoMode);
    }
    void OnStoppedPhotoMode(PhotoCapture.PhotoCaptureResult result)
    {
        // Shutdown our photo capture resource
        photoCaptureObject.Dispose();
        photoCaptureObject = null;
    }
}

Static Properties Property Description SupportedResolutions A list of all the supported device resolutions for taking pictures. Static Methods Method Description CreateAsync Asynchronously creates an instance of a PhotoCapture object that can be used to capture photos.

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