The www.texture is known to cause hiccups when large Texture is downloaded.
Things you should try:
1.Use the WWW's LoadImageIntoTexture function which replaces the contents of an existing Texture2D with an image from the downloaded data. Keep reading if problem is still not solved.
WWW www = new WWW("file://" + filePath);
yield return www;
///////m_myTexture = www.texture; // Commenting this line removes frame out
www.LoadImageIntoTexture(m_myTexture);
2.Use the www.textureNonReadable variable
Using www.textureNonReadable instead of www.texture can also speed up your loading time. I'be seen instances of this happening from time to time.
3.Use the function Graphics.CopyTexture to copy from one Texture to another. This should be fast. Continue reading if problem is still not solved.
//Create new Empty texture with size that matches source info
m_myTexture = new Texture2D(www.texture.width, www.texture.height, www.texture.format, false);
Graphics.CopyTexture(www.texture, m_myTexture);
4.Use Unity's UnityWebRequest API. This replaced the WWW class. You must have Unity 5.2 and above in order to use this. It has GetTexture function that is optimized for downloading textures.
using (UnityWebRequest www = UnityWebRequest.GetTexture("http://www.my-server.com/image.png"))
{
yield return www.Send();
if (www.isError)
{
Debug.Log(www.error);
}
else
{
m_myTexture = DownloadHandlerTexture.GetContent(www);
}
}
If the three options above did not solve the freezing problem, another solution is copying the pixels one by one in a coroutine function with the GetPixel and SetPixel functions. You add a counter and set when you want it to wait. It spaced the Texture copying over time.
5.Copy Texture2D pixels one by one with the GetPixel and SetPixel functions. The example code includes 8K texture from Nasa for testing purposes. It won't block while copying the Texture. If it does, decrease the value of the LOOP_TO_WAIT variable in the copyTextureAsync function. You also have option to provide a function that will be called when this is done copying the Texture.
public Texture2D m_myTexture;
void Start()
{
//Application.runInBackground = true;
StartCoroutine(downloadTexture());
}
IEnumerator downloadTexture()
{
//http://visibleearth.nasa.gov/view.php?id=79793
//http://eoimages.gsfc.nasa.gov/images/imagerecords/79000/79793/city_lights_africa_8k.jpg
string url = "http://eoimages.gsfc.nasa.gov/images/imagerecords/79000/79793/city_lights_africa_8k.jpg";
//WWW www = new WWW("file://" + filePath);
WWW www = new WWW(url);
yield return www;
//m_myTexture = www.texture; // Commenting this line removes frame out
Debug.Log("Downloaded Texture. Now copying it");
//Copy Texture to m_myTexture WITHOUT callback function
//StartCoroutine(copyTextureAsync(www.texture));
//Copy Texture to m_myTexture WITH callback function
StartCoroutine(copyTextureAsync(www.texture, false, finishedCopying));
}
IEnumerator copyTextureAsync(Texture2D source, bool useMipMap = false, System.Action callBack = null)
{
const int LOOP_TO_WAIT = 400000; //Waits every 400,000 loop, Reduce this if still freezing
int loopCounter = 0;
int heightSize = source.height;
int widthSize = source.width;
//Create new Empty texture with size that matches source info
m_myTexture = new Texture2D(widthSize, heightSize, source.format, useMipMap);
for (int y = 0; y < heightSize; y++)
{
for (int x = 0; x < widthSize; x++)
{
//Get color/pixel at x,y pixel from source Texture
Color tempSourceColor = source.GetPixel(x, y);
//Set color/pixel at x,y pixel to destintaion Texture
m_myTexture.SetPixel(x, y, tempSourceColor);
loopCounter++;
if (loopCounter % LOOP_TO_WAIT == 0)
{
//Debug.Log("Copying");
yield return null; //Wait after every LOOP_TO_WAIT
}
}
}
//Apply changes to the Texture
m_myTexture.Apply();
//Let our optional callback function know that we've done copying Texture
if (callBack != null)
{
callBack.Invoke();
}
}
void finishedCopying()
{
Debug.Log("Finished Copying Texture");
//Do something else
}
