Load Shader Debugging

Use RWStructuredBuffer to read values from pixel shader variables. (reference by przemyslawzaworski)
(https://www.youtube.com/watch?v=ZUPZTet54mU&ab_channel=PrzemyslawZaworski)

Assets/Debugging/ShaderDebugging.cs

@@ -0,0 +1,70 @@
+using UnityEngine;
+
+namespace UnityVolumeRendering
+{
+	public class ShaderDebugging : MonoBehaviour
+	{
+		public GameObject target;
+
+		private Material material;
+		private ComputeBuffer buffer;
+		public Vector4[] element;
+		private string label;
+		private Renderer render;
+
+		MeshRenderer meshRenderer;
+		Material mat;
+
+
+		void Load()
+		{			
+			buffer = new ComputeBuffer(10, 16, ComputeBufferType.Default);
+			element = new Vector4[10];
+			for(int i=0; i <buffer.count; i++)
+            {
+				element[i] = new Vector4(0, 0, 0, 0);	
+			}		
+			buffer.SetData(element);
+
+			label = string.Empty;			
+			render = target.GetComponent<Renderer>();
+			material = render.material;
+		}
+
+		void Start()
+		{			
+			Load();		
+			VolumeRenderedObject[] objects = FindObjectsOfType<VolumeRenderedObject>();
+			if (objects.Length == 1)
+			{
+				meshRenderer = objects[0].meshRenderer;
+				mat = meshRenderer.material;
+			}
+		}
+
+		void Update()
+		{
+			Graphics.ClearRandomWriteTargets();
+			material.SetPass(0);
+			material.SetBuffer("buffer", buffer);			
+			Graphics.SetRandomWriteTarget(1, buffer, false);		
+
+			buffer.GetData(element);			
+
+			label = (element != null && render.isVisible) ? element[0].ToString() : string.Empty;						
+		}
+
+        void OnGUI()
+        {
+            GUIStyle style = new GUIStyle();
+
+            GUI.color = Color.white;
+            style.fontSize = 32;          
+        }
+
+        void OnDestroy()
+		{			
+			buffer.Dispose();		
+		}
+	}
+}

Assets/Scripts/VolumeObject/VolumeObjectFactory.cs

@@ -133,6 +133,10 @@ public static VolumeRenderedObject CreateObject(VolumeDataset dataset)
             outerObject.transform.localScale = new Vector3((float)Math.Round((decimal)dataset.dimX / maxDim, 2), (float)Math.Round((decimal)dataset.dimY / maxDim, 2), (float)Math.Round((decimal)dataset.dimZ / maxDim, 2));
             meshContainer.AddComponent<BoxCollider>();
 
+            GameObject ShaderBuffer = new GameObject("ShaderBuffer");
+            ShaderDebugging shaderDebugObj = ShaderBuffer.AddComponent<ShaderDebugging>();
+            shaderDebugObj.target = meshContainer;
+
             outerObject.transform.localRotation = Quaternion.Euler(90.0f, 0.0f, 0.0f);
 
             MeshRenderer meshRenderer = meshContainer.GetComponent<MeshRenderer>();