Development Doc.md

• VR Development Basics
• Multiplayer Virtual Reality Synchronization
• Voice Chat Implementation
• Multiplatform Development
• Marker Instantiation
  • Physics.Raycast
  • MarkerPrefab preparation
  • PhotonNetwork.Instantiate
• Save data to Google Spreadsheet
  • Create a form
  • Send the data from Unity
    • Get the form response address
    • Get the form entry id

VR Development Basics

Multiplayer Virtual Reality Synchronization

Voice Chat Implementation

Multiplatform Development

Marker Instantiation

When user is looking at an exhibit, he could add a mark add to that exhibit to highlight his focus point. The basic idea of this is to instantiation a new object and add it to the exhist exhibit.

Physics.Raycast

A ray is an infinitely long line emitted in one direction from a point in the three-dimensional world. On the ray's trajectory, the emission stops once it collides with the model with the collider added. We can first use the ray to achieve positioning function, and then generate markers according to the coordinates.

var ray = new Ray(this.transform.position, this.transform.forward);
RaycastHit hit;
if (Physics.Raycast(ray, out hit))
{
    // To-do
}

MarkerPrefab preparation

• Create a new folder named Resources and put the marker prefab in it.
• Set this prefab to one GameObject in the following code.

PhotonNetwork.Instantiate

After getting the position, you could use this position to instantiate a new marker. The difference between PhotonNetwork.Instantiate and Instantiate is that the former could instantiante a networked object which could be viewed by all users, while the later could only get a local object.

public GameObject MarkerPrefab;

var ray = new Ray(this.transform.position, this.transform.forward);
RaycastHit hit;
if (Physics.Raycast(ray, out hit))
{
    // The raycast will estimate whether the collider is on target object 
    if (hit.collider.gameObject.tag == "painting")
    {
        GameObject target = PhotonNetwork.Instantiate(MarkerPrefab.name, hit.point, Quaternion.identity);
        target.transform.SetParent(layer.transform, false);
        target.transform.position = hit.point;
    
        StartCoroutine(Post(hit.point));
        StartCoroutine(Damage(5f,target));

    }

}

• VR Development Basics
• Multiplayer Virtual Reality Synchronization
• Voice Chat Implementation
• Multiplatform Development
• Marker Instantiation
  • Physics.Raycast
  • MarkerPrefab preparation
  • PhotonNetwork.Instantiate
• Save data to Google Spreadsheet
  • Create a form
  • Send the data from Unity
    • Get the form response address
    • Get the form entry id To destroy the object, you could this the following method. Becuase the noral Destroy()function could not destroy a networked object, only the PhotonNetwork.Destroy() could destroy the networked object. However, PhotonNetwork.Destroy() could not set when to destroy the object, so we should use the StartCoroutine() method.

IEnumerator Damage(float seconds, GameObject gameobject)
{
    yield return new WaitForSeconds(seconds);
    PhotonNetwork.Destroy(gameobject);
}

Here display the marker:

Save data to Google Spreadsheet

Tutorial Video

Create a form

First, you need to create a google form.

Send the data from Unity

private string Focus_BASE_URL = "https://docs.google.com/forms/u/0/d/e/1FAIpQLSewak7bEnLm-mHYeJIXDzh8ghZVrtz6w5DXf7M3RikEuJCorQ/formResponse";

IEnumerator Post(Vector3 relativePos)
{

    WWWForm form = new WWWForm();

    string BASE_URL = null;
    System.DateTime currentTime = new System.DateTime();

    form.AddField("entry.1008590343", PhotonNetwork.CurrentRoom.Name.ToString());
    form.AddField("entry.302544606", PhotonNetwork.NickName.ToString());
    currentTime = new System.DateTime();
    currentTime = System.DateTime.Now;
    form.AddField("entry.1386772403", currentTime.ToString("s"));
    form.AddField("entry.527127655", relativePos.ToString("F6"));

    BASE_URL = Focus_BASE_URL;

    byte[] rawData = form.data;
    WWW WWW = new WWW(BASE_URL, rawData);
    yield return WWW;
}

Get the form response address

After setting down the form, go to the pre-filled mode as the following picture. Then press Ctrl+U button to get the source code page, Ctrl+F to search for Form Action label.

Get the form entry id

In the pre-filled page, right click each ansuer inputfiled and click Inspect. Find the information as shown in the following image.

So far, we have finished the data save part. Once a maker is instantiated, the information will be stored.