Merge pull request #67 from unity/add-depth-gradient-shader

Improve the depth images scene

Assets/Scripts/DisplayDepthImage.cs

-using System;
-using Unity.Collections.LowLevel.Unsafe;
-using UnityEngine;
 using UnityEngine.UI;
 using UnityEngine.XR.ARFoundation;
 using UnityEngine.XR.ARSubsystems;
     /// <summary>
-    /// This component tests getting the latest camera image
-    /// and converting it to RGBA format. If successful,
-    /// it displays the image on the screen as a RawImage
-    /// and also displays information about the image.
-    ///
-    /// This is useful for computer vision applications where
-    /// you need to access the raw pixels from camera image
-    /// on the CPU.
-    ///
-    /// This is different from the ARCameraBackground component, which
-    /// efficiently displays the camera image on the screen. If you
-    /// just want to blit the camera texture to the screen, use
-    /// the ARCameraBackground, or use Graphics.Blit to create
-    /// a GPU-friendly RenderTexture.
-    ///
-    /// In this example, we get the camera image data on the CPU,
-    /// convert it to an RGBA format, then display it on the screen
-    /// as a RawImage texture to demonstrate it is working.
-    /// This is done as an example; do not use this technique simply
-    /// to render the camera image on screen.
+    /// This component displays a picture-in-picture view of the environment depth texture, the human depth texture, or
+    /// the human stencil texture.
-    public class TestDepthImage : MonoBehaviour
+    public class DisplayDepthImage : MonoBehaviour
-        [SerializeField]
-        [Tooltip("The AROcclusionManager which will produce frame events.")]
-        AROcclusionManager m_OcclusionManager;
+        /// <summary>
+        /// The display mode for the texture widget. Values must match the UI dropdown.
+        /// </summary>
+        enum DisplayMode
+        {
+            EnvironmentDepth = 0,
+            HumanDepth = 1,
+            HumanStencil = 2,
+        }
+
+        /// <summary>
+        /// Name of the max distance property in the shader.
+        /// </summary>
+        const string k_MaxDistanceName = "_MaxDistance";
+
+        /// <summary>
+        /// Name of the display rotation matrix in the shader.
+        /// </summary>
+        const string k_DisplayRotationPerFrameName = "_DisplayRotationPerFrame";
+
+        /// <summary>
+        /// The default texture aspect ratio.
+        /// </summary>
+        const float k_DefaultTextureAspectRadio = 1.0f;
+
+        /// <summary>
+        /// ID of the max distance  property in the shader.
+        /// </summary>
+        static readonly int k_MaxDistanceId = Shader.PropertyToID(k_MaxDistanceName);
+
+        /// <summary>
+        /// ID of the display rotation matrix in the shader.
+        /// </summary>
+        static readonly int k_DisplayRotationPerFrameId = Shader.PropertyToID(k_DisplayRotationPerFrameName);
+
+        /// <summary>
+        /// A string builder for construction of strings.
+        /// </summary>
+        readonly StringBuilder m_StringBuilder = new StringBuilder();
+
+        /// <summary>
+        /// The current screen orientation remembered so that we are only updating the raw image layout when it changes.
+        /// </summary>
+        ScreenOrientation m_CurrentScreenOrientation;
+
+        /// <summary>
+        /// The current texture aspect ratio remembered so that we can resize the raw image layout when it changes.
+        /// </summary>
+        float m_TextureAspectRatio = k_DefaultTextureAspectRadio;
+
+        /// <summary>
+        /// The mode indicating which texture to display.
+        /// </summary>
+        DisplayMode m_DisplayMode = DisplayMode.EnvironmentDepth;
+
+        /// <summary>
+        /// The display rotation matrix for the shader.
+        /// </summary.
+        Matrix4x4 m_DisplayRotationMatrix = Matrix4x4.identity;
+
+#if UNITY_ANDROID
+        /// <summary>
+        /// A matrix to flip the Y coordinate for the Android platform.
+        /// </summary>
+        Matrix4x4 k_AndroidFlipYMatrix = Matrix4x4.identity;
+#endif // UNITY_ANDROID
 
         /// <summary>
         /// Get or set the <c>AROcclusionManager</c>.
-            get { return m_OcclusionManager; }
-            set { m_OcclusionManager = value; }
+            get => m_OcclusionManager;
+            set => m_OcclusionManager = value;
-        RawImage m_RawImage;
+        [Tooltip("The AROcclusionManager which will produce depth textures.")]
+        AROcclusionManager m_OcclusionManager;
+
+        /// <summary>
+        /// Get or set the <c>ARCameraManager</c>.
+        /// </summary>
+        public ARCameraManager cameraManager
+        {
+            get => m_CameraManager;
+            set => m_CameraManager = value;
+        }
+
+        [SerializeField]
+        [Tooltip("The ARCameraManager which will produce camera frame events.")]
+        ARCameraManager m_CameraManager;
 
         /// <summary>
         /// The UI RawImage used to display the image on screen.
-            get { return m_RawImage; }
-            set { m_RawImage = value; }
+            get => m_RawImage;
+            set => m_RawImage = value;
-        Text m_ImageInfo;
+        RawImage m_RawImage;
 
         /// <summary>
         /// The UI Text used to display information about the image on screen.
-            get { return m_ImageInfo; }
-            set { m_ImageInfo = value; }
+            get => m_ImageInfo;
+            set => m_ImageInfo = value;
+        }
+
+        [SerializeField]
+        Text m_ImageInfo;
+
+        /// <summary>
+        /// The depth material for rendering depth textures.
+        /// </summary>
+        public Material depthMaterial
+        {
+            get => m_DepthMaterial;
+            set => m_DepthMaterial = value;
+        }
+
+        [SerializeField]
+        Material m_DepthMaterial;
+
+        /// <summary>
+        /// The stencil material for rendering stencil textures.
+        /// </summary>
+        public Material stencilMaterial
+        {
+            get => m_StencilMaterial;
+            set => m_StencilMaterial = value;
-        void LogTextureInfo(StringBuilder stringBuilder, string textureName, Texture2D texture)
+        [SerializeField]
+        Material m_StencilMaterial;
+
+        /// <summary>
+        /// The max distance value for the shader when showing an environment depth texture.
+        /// </summary>
+        public float maxEnvironmentDistance
-            stringBuilder.AppendFormat("texture : {0}\n", textureName);
-            if (texture == null)
-            {
-                stringBuilder.AppendFormat("   <null>\n");
-            }
-            else
-            {
-                stringBuilder.AppendFormat("   format : {0}\n", texture.format.ToString());
-                stringBuilder.AppendFormat("   width  : {0}\n", texture.width);
-                stringBuilder.AppendFormat("   height : {0}\n", texture.height);
-                stringBuilder.AppendFormat("   mipmap : {0}\n", texture.mipmapCount);
-            }
+            get => m_MaxEnvironmentDistance;
+            set => m_MaxEnvironmentDistance = value;
+        }
+
+        [SerializeField]
+        float m_MaxEnvironmentDistance = 8.0f;
+
+        /// <summary>
+        /// The max distance value for the shader when showing an human depth texture.
+        /// </summary>
+        public float maxHumanDistance
+        {
+            get => m_MaxHumanDistance;
+            set => m_MaxHumanDistance = value;
+        }
+
+        [SerializeField]
+        float m_MaxHumanDistance = 3.0f;
+
+        void Awake()
+        {
+#if UNITY_ANDROID
+            k_AndroidFlipYMatrix[1,1] = -1.0f;
+            k_AndroidFlipYMatrix[2,1] = 1.0f;
+#endif // UNITY_ANDROID
+        }
+
+        void OnEnable()
+        {
+            // Subscribe to the camera frame received event, and initialize the display rotation matrix.
+            Debug.Assert(m_CameraManager != null, "no camera manager");
+            m_CameraManager.frameReceived += OnCameraFrameEventReceived;
+            m_DisplayRotationMatrix = Matrix4x4.identity;
+
+            // When enabled, get the current screen orientation, and update the raw image UI.
+            m_CurrentScreenOrientation = Screen.orientation;
+            UpdateRawImage();
+        }
+
+        void OnDisable()
+        {
+            // Unsubscribe to the camera frame received event, and initialize the display rotation matrix.
+            Debug.Assert(m_CameraManager != null, "no camera manager");
+            m_CameraManager.frameReceived -= OnCameraFrameEventReceived;
+            m_DisplayRotationMatrix = Matrix4x4.identity;
+            // If we are on a device that does supports neither human stencil, human depth, nor environment depth,
+            // display a message about unsupported functionality and return.
-            if ((m_OcclusionManager.descriptor?.supportsHumanSegmentationStencilImage == false)
-                && (m_OcclusionManager.descriptor?.supportsHumanSegmentationDepthImage == false)
-                && (m_OcclusionManager.descriptor?.supportsEnvironmentDepthImage == false))
+            switch (m_DisplayMode)
-                if (m_ImageInfo != null)
-                {
-                    m_ImageInfo.text = "Depth functionality is not supported on this device.";
-                }
-                return;
+                case DisplayMode.HumanDepth:
+                case DisplayMode.HumanStencil:
+                    if ((m_OcclusionManager.descriptor?.supportsHumanSegmentationStencilImage == false)
+                        && (m_OcclusionManager.descriptor?.supportsHumanSegmentationDepthImage == false))
+                    {
+                        LogText("Human segmentation is not supported on this device.");
+
+                        m_RawImage.texture = null;
+                        if (!Mathf.Approximately(m_TextureAspectRatio, k_DefaultTextureAspectRadio))
+                        {
+                            m_TextureAspectRatio = k_DefaultTextureAspectRadio;
+                            UpdateRawImage();
+                        }
+
+                        return;
+                    }
+                    break;
+                case DisplayMode.EnvironmentDepth :
+                default:
+                    if (m_OcclusionManager.descriptor?.supportsEnvironmentDepthImage == false)
+                    {
+                        LogText("Environment depth is not supported on this device.");
+
+                        m_RawImage.texture = null;
+                        if (!Mathf.Approximately(m_TextureAspectRatio, k_DefaultTextureAspectRadio))
+                        {
+                            m_TextureAspectRatio = k_DefaultTextureAspectRadio;
+                            UpdateRawImage();
+                        }
+
+                        return;
+                    }
+                    break;
-            StringBuilder sb = new StringBuilder();
+            // Get all of the occlusion textures.
-            LogTextureInfo(sb, "stencil", humanStencil);
-            LogTextureInfo(sb, "depth", humanDepth);
-            LogTextureInfo(sb, "env", envDepth);
+
+            // Display some text information about each of the textures.
+            m_StringBuilder.Clear();
+            BuildTextureInfo(m_StringBuilder, "stencil", humanStencil);
+            BuildTextureInfo(m_StringBuilder, "depth", humanDepth);
+            BuildTextureInfo(m_StringBuilder, "env", envDepth);
+
+            LogText(m_StringBuilder.ToString());
+            // Decide which to display based on the current mode.
+            Texture2D displayTexture;
+            switch (m_DisplayMode)
+            {
+                case DisplayMode.HumanStencil:
+                    displayTexture = humanStencil;
+                    break;
+                case DisplayMode.HumanDepth:
+                    displayTexture = humanDepth;
+                    break;
+                case DisplayMode.EnvironmentDepth:
+                default:
+                    displayTexture = envDepth;
+                    break;
+            }
+
+            // Assign the texture to display to the raw image.
+            Debug.Assert(m_RawImage != null, "no raw image");
+            m_RawImage.texture = displayTexture;
+
+            // Get the aspect ratio for the current texture.
+            float textureAspectRatio = (displayTexture == null) ? 1.0f : ((float)displayTexture.width / (float)displayTexture.height);
+
+            // If the raw image needs to be updated because of a device orientation change or because of a texture
+            // aspect ratio difference, then update the raw image with the new values.
+            if ((m_CurrentScreenOrientation != Screen.orientation)
+                || !Mathf.Approximately(m_TextureAspectRatio, textureAspectRatio))
+            {
+                m_CurrentScreenOrientation = Screen.orientation;
+                m_TextureAspectRatio = textureAspectRatio;
+                UpdateRawImage();
+            }
+        }
+
+        /// <summary>
+        /// When the camera frame event is raised, capture the display rotation matrix.
+        /// </summary>
+        /// <param name="cameraFrameEventArgs">The arguments when a camera frame event is raised.</param>
+        void OnCameraFrameEventReceived(ARCameraFrameEventArgs cameraFrameEventArgs)
+        {
+            Debug.Assert(m_RawImage != null, "no raw image");
+            if (m_RawImage.material != null)
+            {
+                // Copy the display rotation matrix from the camera.
+                Matrix4x4 cameraMatrix = cameraFrameEventArgs.displayMatrix ?? Matrix4x4.identity;
+
+                Vector2 affineBasisX = new Vector2(1.0f, 0.0f);
+                Vector2 affineBasisY = new Vector2(0.0f, 1.0f);
+                Vector2 affineTranslation = new Vector2(0.0f, 0.0f);
+#if UNITY_IOS
+                affineBasisX = new Vector2(cameraMatrix[0, 0], cameraMatrix[1, 0]);
+                affineBasisY = new Vector2(cameraMatrix[0, 1], cameraMatrix[1, 1]);
+                affineTranslation = new Vector2(cameraMatrix[2, 0], cameraMatrix[2, 1]);
+#endif // UNITY_IOS
+#if UNITY_ANDROID
+                affineBasisX = new Vector2(cameraMatrix[0, 0], cameraMatrix[0, 1]);
+                affineBasisY = new Vector2(cameraMatrix[1, 0], cameraMatrix[1, 1]);
+                affineTranslation = new Vector2(cameraMatrix[0, 2], cameraMatrix[1, 2]);
+#endif // UNITY_ANDROID
+
+                // The camera display matrix includes scaling and offsets to fit the aspect ratio of the device. In most
+                // cases, the camera display matrix should be used directly without modification when applying depth to
+                // the scene because that will line up the depth image with the camera image. However, for this demo,
+                // we want to show the full depth image as a picture-in-picture, so we remove these scaling and offset
+                // factors while preserving the orientation.
+                affineBasisX = affineBasisX.normalized;
+                affineBasisY = affineBasisY.normalized;
+                m_DisplayRotationMatrix = Matrix4x4.identity;
+                m_DisplayRotationMatrix[0,0] = affineBasisX.x;
+                m_DisplayRotationMatrix[0,1] = affineBasisY.x;
+                m_DisplayRotationMatrix[1,0] = affineBasisX.y;
+                m_DisplayRotationMatrix[1,1] = affineBasisY.y;
+                m_DisplayRotationMatrix[2,0] = Mathf.Round(affineTranslation.x);
+                m_DisplayRotationMatrix[2,1] = Mathf.Round(affineTranslation.y);
+
+#if UNITY_ANDROID
+                m_DisplayRotationMatrix = k_AndroidFlipYMatrix * m_DisplayRotationMatrix;
+#endif // UNITY_ANDROID
+
+                // Set the matrix to the raw image material.
+                m_RawImage.material.SetMatrix(k_DisplayRotationPerFrameId, m_DisplayRotationMatrix);
+            }
+        }
+
+        /// <summary>
+        /// Create log information about the given texture.
+        /// </summary>
+        /// <param name="stringBuilder">The string builder to which to append the texture information.</param>
+        /// <param name="textureName">The semantic name of the texture for logging purposes.</param>
+        /// <param name="texture">The texture for which to log information.</param>
+        void BuildTextureInfo(StringBuilder stringBuilder, string textureName, Texture2D texture)
+        {
+            stringBuilder.AppendLine($"texture : {textureName}");
+            if (texture == null)
+            {
+                stringBuilder.AppendLine("   <null>");
+            }
+            else
+            {
+                stringBuilder.AppendLine($"   format : {texture.format}");
+                stringBuilder.AppendLine($"   width  : {texture.width}");
+                stringBuilder.AppendLine($"   height : {texture.height}");
+                stringBuilder.AppendLine($"   mipmap : {texture.mipmapCount}");
+            }
+        }
+
+        /// <summary>
+        /// Log the given text to the screen if the image info UI is set. Otherwise, log the string to debug.
+        /// </summary>
+        /// <param name="text">The text string to log.</param>
+        void LogText(string text)
+        {
-                m_ImageInfo.text = sb.ToString();
+                m_ImageInfo.text = text;
-                Debug.Log(sb.ToString());
+                Debug.Log(text);
+        }
-            // To use the stencil, be sure the HumanSegmentationStencilMode property on the AROcclusionManager is set to a
-            // non-disabled value.
-            m_RawImage.texture = envDepth;
+        /// <summary>
+        /// Update the raw image with the current configurations.
+        /// </summary>
+        void UpdateRawImage()
+        {
+            Debug.Assert(m_RawImage != null, "no raw image");
-            // To use the depth, be sure the HumanSegmentationDepthMode property on the AROcclusionManager is set to a
-            /// non-disabled value.
-            // m_RawImage.texture = eventArgs.humanDepth;
+            // Determine the raw imge rectSize preserving the texture aspect ratio, matching the screen orientation,
+            // and keeping a minimum dimension size.
+            float minDimension = 480.0f;
+            float maxDimension = Mathf.Round(minDimension * m_TextureAspectRatio);
+            Vector2 rectSize;
+            switch (m_CurrentScreenOrientation)
+            {
+                case ScreenOrientation.LandscapeRight:
+                case ScreenOrientation.LandscapeLeft:
+                    rectSize = new Vector2(maxDimension, minDimension);
+                    break;
+                case ScreenOrientation.PortraitUpsideDown:
+                case ScreenOrientation.Portrait:
+                default:
+                    rectSize = new Vector2(minDimension, maxDimension);
+                    break;
+            }
+
+            // Determine the raw image material and maxDistance material parameter based on the display mode.
+            float maxDistance;
+            Material material;
+            switch (m_DisplayMode)
+            {
+                case DisplayMode.HumanStencil:
+                    material = m_StencilMaterial;
+                    maxDistance = m_MaxHumanDistance;
+                    break;
+                case DisplayMode.HumanDepth:
+                    material = m_DepthMaterial;
+                    maxDistance = m_MaxHumanDistance;
+                    break;
+                case DisplayMode.EnvironmentDepth:
+                default:
+                    material = m_DepthMaterial;
+                    maxDistance = m_MaxEnvironmentDistance;
+                    break;
+            }
+
+            // Update the raw image dimensions and the raw image material parameters.
+            m_RawImage.rectTransform.sizeDelta = rectSize;
+            material.SetFloat(k_MaxDistanceId, maxDistance);
+            material.SetMatrix(k_DisplayRotationPerFrameId, m_DisplayRotationMatrix);
+            m_RawImage.material = material;
+        }
+
+        /// <summary>
+        /// Callback when the depth mode dropdown UI has a value change.
+        /// </summary>
+        /// <param name="dropdown">The dropdown UI that changed.</param>
+        public void OnDepthModeDropdownValueChanged(Dropdown dropdown)
+        {
+            // Update the display mode from the dropdown value.
+            m_DisplayMode = (DisplayMode)dropdown.value;
+
+            // Update the raw image following the mode change.
+            UpdateRawImage();
         }
     }
 }

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+    - _Color: {r: 1, g: 1, b: 1, a: 1}
+    - _EmissionColor: {r: 0, g: 0, b: 0, a: 1}

Assets/Materials/HumanStencil.mat.meta

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Assets/Shaders/DepthGradient.shader

+Shader "Unlit/DepthGradient"
+{
+    Properties
+    {
+        _MainTex ("Main Texture", 2D) = "black" {}
+        _MinDistance ("Min Distance", Float) = 0.0
+        _MaxDistance ("Max Distance", Float) = 8.0
+    }
+    SubShader
+    {
+        Tags
+        {
+            "Queue" = "Geometry"
+            "RenderType" = "Opaque"
+            "ForceNoShadowCasting" = "True"
+        }
+
+        Pass
+        {
+            Cull Off
+            ZTest Always
+            ZWrite Off
+            Lighting Off
+            LOD 100
+            Tags
+            {
+                "LightMode" = "Always"
+            }
+
+
+            HLSLPROGRAM
+
+            #pragma vertex vert
+            #pragma fragment frag
+
+            #include "UnityCG.cginc"
+
+            #define real half
+            #define real3 half3
+            #define real4 half4
+            #define TransformObjectToHClip UnityObjectToClipPos
+
+            #define DECLARE_TEXTURE2D_FLOAT(texture) UNITY_DECLARE_TEX2D_FLOAT(texture)
+            #define DECLARE_SAMPLER_FLOAT(sampler)
+            #define SAMPLE_TEXTURE2D(texture,sampler,texcoord) UNITY_SAMPLE_TEX2D(texture,texcoord)
+
+
+            struct appdata
+            {
+                float3 position : POSITION;
+                float2 texcoord : TEXCOORD0;
+            };
+
+            struct v2f
+            {
+                float4 position : SV_POSITION;
+                float2 texcoord : TEXCOORD0;
+            };
+
+            struct fragment_output
+            {
+                real4 color : SV_Target;
+            };
+
+
+            CBUFFER_START(DisplayRotationPerFrame)
+            float4x4 _DisplayRotationPerFrame;
+            CBUFFER_END
+
+
+            v2f vert (appdata v)
+            {
+                v2f o;
+                o.position = TransformObjectToHClip(v.position);
+                o.texcoord = mul(float3(v.texcoord, 1.0f), _DisplayRotationPerFrame).xy;
+                return o;
+            }
+
+
+            real3 HSVtoRGB(real3 arg1)
+            {
+                real4 K = real4(1.0h, 2.0h / 3.0h, 1.0h / 3.0h, 3.0h);
+                real3 P = abs(frac(arg1.xxx + K.xyz) * 6.0h - K.www);
+                return arg1.z * lerp(K.xxx, saturate(P - K.xxx), arg1.y);
+            }
+
+
+            DECLARE_TEXTURE2D_FLOAT(_MainTex);
+            DECLARE_SAMPLER_FLOAT(sampler_MainTex);
+
+            real _MinDistance;
+            real _MaxDistance;
+
+            fragment_output frag (v2f i)
+            {
+                // Sample the environment depth (in meters).
+                float envDistance = SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, i.texcoord).r;
+
+                real lerpFactor = (envDistance - _MinDistance) / (_MaxDistance - _MinDistance);
+                real hue = lerp(0.70h, -0.15h, saturate(lerpFactor));
+                if (hue < 0.0h)
+                {
+                    hue += 1.0h;
+                }
+                real3 color = real3(hue, 0.9h, 0.6h);
+
+                fragment_output o;
+                o.color = real4(HSVtoRGB(color), 1.0h);
+                return o;
+            }
+
+            ENDHLSL
+        }
+    }
+}

Assets/Shaders/DepthGradient.shader.meta

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Assets/Shaders/HumanStencil.shader

+Shader "Unlit/HumanStencil"
+{
+    Properties
+    {
+        _MainTex ("Main Texture", 2D) = "black" {}
+    }
+    SubShader
+    {
+        Tags
+        {
+            "Queue" = "Geometry"
+            "RenderType" = "Opaque"
+            "ForceNoShadowCasting" = "True"
+        }
+
+        Pass
+        {
+            Cull Off
+            ZTest Always
+            ZWrite Off
+            Lighting Off
+            LOD 100
+            Tags
+            {
+                "LightMode" = "Always"
+            }
+
+
+            HLSLPROGRAM
+
+            #pragma vertex vert
+            #pragma fragment frag
+
+            #include "UnityCG.cginc"
+
+            #define real half
+            #define real3 half3
+            #define real4 half4
+            #define TransformObjectToHClip UnityObjectToClipPos
+
+            #define DECLARE_TEXTURE2D_FLOAT(texture) UNITY_DECLARE_TEX2D_FLOAT(texture)
+            #define DECLARE_SAMPLER_FLOAT(sampler)
+            #define SAMPLE_TEXTURE2D(texture,sampler,texcoord) UNITY_SAMPLE_TEX2D(texture,texcoord)
+
+
+            struct appdata
+            {
+                float3 position : POSITION;
+                float2 texcoord : TEXCOORD0;
+            };
+
+            struct v2f
+            {
+                float4 position : SV_POSITION;
+                float2 texcoord : TEXCOORD0;
+            };
+
+            struct fragment_output
+            {
+                real4 color : SV_Target;
+            };
+
+
+            CBUFFER_START(DisplayRotationPerFrame)
+            float4x4 _DisplayRotationPerFrame;
+            CBUFFER_END
+
+
+            v2f vert (appdata v)
+            {
+                v2f o;
+                o.position = TransformObjectToHClip(v.position);
+                o.texcoord = mul(float3(v.texcoord, 1.0f), _DisplayRotationPerFrame).xy;
+                return o;
+            }
+
+
+            DECLARE_TEXTURE2D_FLOAT(_MainTex);
+            DECLARE_SAMPLER_FLOAT(sampler_MainTex);
+
+            fragment_output frag (v2f i)
+            {
+                float stencilValue = SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, i.texcoord).r;
+
+                fragment_output o;
+                o.color = real4(stencilValue, stencilValue, stencilValue, 1.0h);
+                return o;
+            }
+
+            ENDHLSL
+        }
+    }
+}

Assets/Shaders/HumanStencil.shader.meta

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