Can I take a photo in Unity using the device's camera?

问题

I'm entirely unfamiliar with Unity3D's more complex feature set and am curious if it has the capability to take a picture and then manipulate it. Specifically my desire is to have the user take a selfie and then have them trace around their face to create a PNG that would then be texture mapped onto a model.

I know that the face mapping onto a model is simple, but I'm wondering if I need to write the photo/carving functionality into the encompassing Chrome app, or if it can all be done from within Unity. I don't need a tutorial on how to do it, just asking if it's something that is possible.

回答1:

Yes, this is possible. You will want to look at the WebCamTexture functionality.

You create a WebCamTexture and call its Play() function which starts the camera. WebCamTexture, as any Texture, allows you to get the pixels via a GetPixels() call. This allows you to take a snapshot in when you like, and you can save this in a Texture2D. A call to EncodeToPNG() and subsequent write to file should get you there.

Do note that the code below is a quick write-up based on the documentation. I have not tested it. You might have to select a correct device if there are more than one available.

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

public class WebCamPhotoCamera : MonoBehaviour 
{
    WebCamTexture webCamTexture;

    void Start() 
    {
        webCamTexture = new WebCamTexture();
        GetComponent<Renderer>().material.mainTexture = webCamTexture; //Add Mesh Renderer to the GameObject to which this script is attached to
        webCamTexture.Play();
    }

    IEnumerator TakePhoto()  // Start this Coroutine on some button click
    {

    // NOTE - you almost certainly have to do this here:

     yield return new WaitForEndOfFrame(); 

    // it's a rare case where the Unity doco is pretty clear,
    // http://docs.unity3d.com/ScriptReference/WaitForEndOfFrame.html
    // be sure to scroll down to the SECOND long example on that doco page 

        Texture2D photo = new Texture2D(webCamTexture.width, webCamTexture.height);
        photo.SetPixels(webCamTexture.GetPixels());
        photo.Apply();

        //Encode to a PNG
        byte[] bytes = photo.EncodeToPNG();
        //Write out the PNG. Of course you have to substitute your_path for something sensible
        File.WriteAllBytes(your_path + "photo.png", bytes);
    }
}

回答2:

For those trying to get the camera to render live feed, here's how I managed to pull it off. First, I edited Bart's answer so the texture would be assigned on Update rather than just on Start:

void Start()
{
    webCamTexture = new WebCamTexture();
    webCamTexture.Play();
}

void Update()
{
    GetComponent<RawImage>().texture = webCamTexture;
}

Then I attached the script to a GameObject with a RawImage component. You can easily create one by Right Click -> UI -> RawImage in the Hierarchy in the Unity Editor (this requires Unity 4.6 and above). Running it should show a live feed of the camera in your view. As of this writing, Unity 5 supports the use of webcams in the free personal edition of Unity 5.

I hope this helps anyone looking for a good way to capture live camera feed in Unity.

回答3:

It is possible. I highly recommend you look at WebcamTexture Unity API. It has some useful functions:

GetPixel() -- Returns pixel color at coordinates (x, y).
GetPixels() -- Get a block of pixel colors.
GetPixels32() -- Returns the pixels data in raw format.
MarkNonReadable() -- Marks WebCamTexture as unreadable
Pause() -- Pauses the camera.
Play() -- Starts the camera.
Stop() -- Stops the camera.

回答4:

Bart's answer has a required modification. I used his code and the pic I was getting was black. Required modification is that we have to convert TakePhoto to a coroutine and add

yield return new WaitForEndOfFrame();

at the start of Coroutine. (Courtsey @fafase) For more details see http://docs.unity3d.com/ScriptReference/WaitForEndOfFrame.html

You can also refer to

Take photo using webcam is giving black output[Unity3D]

回答5:

There is a plugin available for this type of functionality called Camera Capture Kit - https://www.assetstore.unity3d.com/en/#!/content/56673 and while the functionality provided is geared towards mobile it contains a demo of how you can use the WebCamTexture to take a still image.

回答6:

Yes, You can. I created Android Native camera plugin that can open your Android device camera, capture image, record video and save that in the desired location of your device with just a few lines of code.

回答7:

If you want to do that without using a third party plugin then @FuntionR solution will help you. But, if you want to save the captured photo to the gallery (Android & iOS)then it's not possible within unity, you have to write native code to transfer photo to gallery and then call it from unity.

Here is a summarise blog which will guide you to achieve your goal. http://unitydevelopers.blogspot.com/2018/07/pick-image-from-gallery-in-unity3d.html

Edit: Note that, the above thread describes image picking from the gallery, but the same process will be for saving the image to the gallery.

来源：https://stackoverflow.com/questions/24496438/can-i-take-a-photo-in-unity-using-the-devices-camera

标签

unity3d

photo