Exception Loading PNG Bytes for Texture

Question

I am storing a PNG in a textfile. I convert it to a PNG using:

             myTexture.EncodeToPNG()

and then save. I then load the bytes with:

             Texture2D texture = new Texture2D(100, 100);
             texture.LoadRawTextureData(myPNGBytes);

This throws the following error:

            UnityException: LoadRawTextureData: not enough data provided (will result in overread).

I know that the PNG is stored correctly because when I use an online base64 converter the image is displayed. I've tried loading with several different formats, but all throw the same exception. What am I doing wrong?

EDIT: when I check the format of the Texture2D before saving, it says RGB24. I get the same error when I instantiate the texture with this format and then load.

EDIT: Even when I skip the saving step and just do:

             byte[] bytes = result.Texture.EncodeToPNG();
             Texture2D texture = new Texture2D(100, 100);
             texture.LoadRawTextureData(bytes);

I get the same exception. So my question is what is the inverse of Texture2D.EncodeToPNG()

Answer 1

Answer by andrew-lukasik · Nov 17, 2020 at 07:49 PM

EncodeToPNG bytes aren't raw. Those're, well, encoded.

 byte[] bytes = texture.GetRawTextureData();// raw bytes to save
 texture.LoadRawTextureData( bytes );// this how to load raw bytes
 texture.Apply( updateMipmaps:true , makeNoLongerReadable:true );// uploads changes to GPU

Raw in this context mean GPU-ready. Encoded to png, on the other hand, are file system - ready.

Alternatively, store/read PNG bytes:

 byte[] PNGbytes = texture.EncodeToPNG();// png-encoded bytes to save
 
 texture.LoadImage( PNGbytes );// this is how to load png-encoded bytes
 texture.Apply( updateMipmaps:true , makeNoLongerReadable:true );// uploads changes to GPU

Add comment · Show 1 · Share

andrew-lukasik · Nov 17, 2020 at 07:50 PM 0

Share

PS: You may want to compress these raw bytes before saving (+decompress after loading) to save on storage space.

Exception Loading PNG Bytes for Texture

1 Reply

Your answer

Follow this Question

Related Questions