ImageConversion.EncodeNativeArrayToEXR

Parameters

Description

Encodes this native array into the EXR format.

This function returns a NativeArray<byte> which is the EXR data. Write this data to disk to get the data in the EXR file format.

It is best to use this function for HDR texture formats (either 16-bit or 32-bit floats). The default output format is 16-bit float EXR.

The encoded EXR data will always contain an alpha channel.

For single-channel red textures ( R8, R16, RFloat and RHalf ), the encoded data will be in grayscale mode.

The native array that this function returns is allocated with the persistent allocator, so this function should only be called from the main thread.

// Saves screenshot as EXR file.
using System.Collections;
using System.IO;
using Unity.Collections;
using UnityEngine;

public class EXRScreenSaver : MonoBehaviour
{
    // Take a shot immediately
    IEnumerator Start()
    {
        yield return SaveScreenEXR();
    }

    IEnumerator SaveScreenEXR()
    {
        // Read the screen buffer after rendering is complete
        yield return new WaitForEndOfFrame();

        // Create a texture in RGBAFloat format the size of the screen
        int width = Screen.width;
        int height = Screen.height;
        Texture2D tex = new Texture2D(width, height, TextureFormat.RGBAFloat, false);

        // Read the screen contents into the texture
        tex.ReadPixels(new Rect(0, 0, width, height), 0, 0);
        tex.Apply();

        // Encode the bytes in EXR format
        NativeArray<byte> imageBytes = new NativeArray<byte>(tex.GetRawTextureData(), Allocator.Temp);
        var bytes = ImageConversion.EncodeNativeArrayToEXR(imageBytes, tex.graphicsFormat, (uint)width, (uint)height);
        Object.Destroy(tex);

        // Write the returned byte array to a file in the project folder
        File.WriteAllBytes(Application.dataPath + "/../SavedScreen.exr", bytes.ToArray());
    }
}

Additional resources: EncodeToEXR, EncodeArrayToEXR, EncodeNativeArrayToPNG, EncodeNativeArrayToJPG, EncodeNativeArrayToTGA.