HDRI + Bloom on-the-fly tone adjustment

Questions & Answers
1

How can I properly implement HDRI on-the-fly tone adjustment and bloom in Unity?

2

I am currently working on the same topic. Let your main camera render into a RenderTexture which is in ARGBHalf format (you can create these RenderTextures from script, see below).

Then create another camera which renderes nothing (Culling Mask: Nothing), but in the OnRenderImage() function you replace the source image with the RenderTexture from your mainCamera and render this with a tonemapping shader.

Then you could add a bloom filter effect to the second camera...

Here is the script I attach to the MainCamera (it's just a little test):

using UnityEngine;

[ExecuteInEditMode]
[RequireComponent(typeof(Camera))]
public class OutputCamera : MonoBehaviour {

    public Shader toneMapShader;

    [HideInInspector]
    public RenderTexture outputTexture;

    public Camera mainCam;
    public float exposure = 1.0f;

    private Material ToneMapMaterial = null;
    private Material GetMaterial()
    {
        if (ToneMapMaterial == null)
        {
            ToneMapMaterial = new Material(toneMapShader);
            ToneMapMaterial.hideFlags = HideFlags.HideAndDontSave;
        }
        return ToneMapMaterial;
    }

    void Start () {
        outputTexture = new RenderTexture(Screen.width, Screen.height, 1);
        outputTexture.hideFlags = HideFlags.DontSave;

        //Set output texture to 16bit Format
        outputTexture.format = RenderTextureFormat.ARGBHalf;

        if(mainCam != null)
            mainCam.targetTexture = outputTexture;
    }

    void OnRenderImage(RenderTexture source, RenderTexture dest)
    {
        GetMaterial().SetFloat("_exposure", exposure);
        ImageEffects.BlitWithMaterial(GetMaterial(), outputTexture, dest);
    }
}

It seems like you cannot insert fullscreen effects on the mainCamera, because then the HDR information gets lost (the input will be ARGB32), but I am not sure about that...

3

where can i get the bloom filter in the second camera?