unity 拿shadowmap/ sample shadow map/拿_ShadowMapTexture

https://gamedev.stackexchange.com/questions/96051/unity-5-how-to-get-a-shadowmap

UNITY_DECLARE_SHADOWMAP(tex) - declares a shadowmap texture variable with name “tex”. UNITY_SAMPLE_SHADOW(tex,uv) - samples shadowmap texture “tex” at given “uv” coordinate (XY components are texture location, Z component is depth to compare with). Returns single float value with the shadow term in 0..1 range. UNITY_SAMPLE_SHADOW_PROJ(tex,uv) - similar to above, but does a projective shadowmap read. “uv” is a float4, all other components are divided by .w for doing the lookup.

https://docs.unity3d.com/Manual/SL-BuiltinMacros.html

https://docs.unity3d.com/ScriptReference/Rendering.CommandBuffer.SetShadowSamplingMode.html

using UnityEngine;
using UnityEngine.Rendering;

[RequireComponent(typeof(Camera))]
public class RawShadowmapDepth : MonoBehaviour
{
    public Light m_Light;
    RenderTexture m_ShadowmapCopy;

    void Start()
    {
        RenderTargetIdentifier shadowmap = BuiltinRenderTextureType.CurrentActive;
        m_ShadowmapCopy = new RenderTexture(1024, 1024, 0);
        CommandBuffer cb = new CommandBuffer();

        // Change shadow sampling mode for m_Light's shadowmap.
        cb.SetShadowSamplingMode(shadowmap, ShadowSamplingMode.RawDepth);

        // The shadowmap values can now be sampled normally - copy it to a different render texture.
        cb.Blit(shadowmap, new RenderTargetIdentifier(m_ShadowmapCopy));

        // Execute after the shadowmap has been filled.
        m_Light.AddCommandBuffer(LightEvent.AfterShadowMap, cb);

        // Sampling mode is restored automatically after this command buffer completes, so shadows will render normally.
    }

    void OnRenderImage(RenderTexture src, RenderTexture dest)
    {
        // Display the shadowmap in the corner.
        Camera.main.rect = new Rect(0, 0, 0.5f, 0.5f);
        Graphics.Blit(m_ShadowmapCopy, dest);
        Camera.main.rect = new Rect(0, 0, 1, 1);
    }
}
=================
拿 _CameraDepthTexture
https://docs.unity3d.com/Manual/SL-CameraDepthTexture.html
声明下

 _CameraDepthTexture就可以了