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unitycoder/DepthRenderTextureTest.cs

Created September 20, 2023 04:47
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  1. unitycoder created this gist Sep 20, 2023.
    46 changes: 46 additions & 0 deletions DepthRenderTextureTest.cs
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    Original file line number Diff line number Diff line change
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    using System.Collections;
    using System.Collections.Generic;
    using UnityEngine;

    [RequireComponent(typeof(Camera))]
    public class DepthRenderTextureTest : MonoBehaviour
    {
    public bool OnlyRenderToDepth;
    public RenderTexture RTColor;
    public RenderTexture RTDepth;
    public RenderTexture RTDepthCopy;

    void Update()
    {
    Camera cam = GetComponent<Camera>();

    if (RTDepthCopy)
    RenderTexture.ReleaseTemporary(RTDepthCopy);

    RTColor = RenderTexture.GetTemporary(1024, 1024, 0, RenderTextureFormat.Default); // no depth buffer
    RTDepth = RenderTexture.GetTemporary(1024, 1024, 24, RenderTextureFormat.Depth); // only a depth buffer
    RTDepthCopy = RenderTexture.GetTemporary(1024, 1024, 0, RenderTextureFormat.RFloat); // depth buffer copy

    // note: if the objects being rendered have code in their fragment shader, that's still all running even
    // there is no color buffer to render to. so preferably it should be using replacement shaders or only see objects // with depth only materials applied.
    if (OnlyRenderToDepth)
    cam.targetTexture = RTDepth;
    else
    cam.SetTargetBuffers(RTColor.colorBuffer, RTDepth.depthBuffer);
    cam.Render();
    cam.targetTexture = null;

    // at this point you can sample the depth render texture
    // can't use CopyTexture unless both RTs are Format.Depth, but that is an alternative!
    Graphics.Blit(RTDepth, RTDepthCopy);

    RenderTexture.ReleaseTemporary(RTColor);
    RenderTexture.ReleaseTemporary(RTDepth);
    }

    void OnRenderImage(RenderTexture src, RenderTexture dst)
    {
    // proof that the copy worked
    Graphics.Blit(RTDepthCopy, dst);
    }
    }